GAS PURIFICATION PROCESS

Abstract

GAS PURIFICATION PROCESS The present invention relates to the use, for gas treatment, of an adsorbent material comprising A) at least one zeolite selected from LTA-type zeolites and FAU-type zeolites with a Si / Al molar ratio between 1 and 3, inclusive, B) at least one zeolite selected from FAU-type zeolites with a Si / Al molar ratio between 3 and 30, exclusive, MFI-type zeolites, and BEA-type zeolites, and C) at least one agglomerating binder. The invention also relates to the gas treatment process using said adsorbent material. Fig.: none

Description

Title of the invention: GAS PURIFICATION PROCESS

[0001] The present invention relates to the field of gas stream purification and more particularly to the purification and depollution of air in general, including ambient air, polluted air, stale air, and other air. The present invention also relates to the use of specific zeolite adsorbents for gas stream purification and to the process of treating said gas streams using said specific zeolite adsorbents.

[0002] Various systems exist today that are suitable for purifying gas streams and, more specifically, for air treatment. Systems designed to remove specific molecules that are gas stream pollutants include, for example, activated carbons, metal oxide-based catalysts, and others.

[0003] These known systems, however, have certain drawbacks, particularly because they are not always suitable for gas streams containing numerous pollutants of different natures and with very diverse molecule sizes. Thus, for certain applications, and especially for finishing treatments, these known and commonly used systems do not provide complete satisfaction.

[0004] When possible, for example in the presence of two well-identified impurities, it is already known to have separate and specific zeolite adsorbent beds for each impurity, or even to mix two different zeolite adsorbents in the same adsorption bed. Unfortunately, the number of impurities and their nature are not always known, or extensive, lengthy, and costly analyses are required, making it difficult to determine the number of adsorbent beds needed, the type of zeolites to use in the adsorbent beds, and the order in which the treatments should be carried out.

[0005] International application WO24123590 describes an activated composition, based on activated carbons and polymers, and possibly small amounts of zeolites, for controlling undesirable bad odors containing complex sulfur and harmful volatile organic compounds (VOCs), the activated composition comprising a support of spherical activated carbon particles.

[0006] Despite all these documents enriching the knowledge of those skilled in the art, there remains a need today for a versatile adsorbent material, that is to say, one capable of adsorbing more than two, advantageously more than three, or even more than four different impurities present in a gaseous matrix. More specifically, it There remains today a need for a simple and effective method capable of purifying various polluted gas streams, using a versatile adsorbent material.

[0007] Indeed, it would be desirable to have a single zeolitic adsorbent material capable of adsorbing different impurities, and in particular a zeolitic adsorbent material having multiple and different adsorption characteristics, capable of adsorbing both small molecules, but also larger molecules, hydrophilic and hydrophobic molecules, organic and inorganic molecules, or even molecules that can be oxidized or reduced.

[0008] Thus, it would be desirable to have a versatile adsorbent material available for the treatment and purification of gas streams, particularly air. This material, through its versatile adsorption properties, could allow for the simultaneous treatment of numerous contaminants, thereby avoiding the need to associate a specific type of contaminant with a particular adsorbent structure, and thus avoiding the need for a succession of different adsorbents or numerous successive or sequential treatments. The versatile adsorbent material of the invention is therefore particularly well-suited to the treatment and purification of gases containing various unspecified and / or unidentified impurities.

[0009] With such a versatile zeolitic adsorbent material, it would therefore be possible to consider the treatment and purification of gases, for example in confined environments, odor removal, purification of streams from recycling operations, chemical, mechanical, physical, or organic recycling (fermentation, composting, enzymatic digestion, and others), from cracking operations, and in particular from chemical recycling and / or cracking of plastics, but also for the purification of streams in the food industry, in the field of packaging.

[0010] Such a versatile zeolitic adsorbent material should be effective, without requiring a complete and precise identification of all the impurities to be removed, often defined by families of molecules and their derivatives.

[0011] Thus, a first objective of the present invention is to propose the use of a versatile zeolitic adsorbent material for the treatment of gas, said versatile zeolitic adsorbent material allowing the removal of a large number of impurities, more specifically more than two impurities, or even more than three impurities, and this, concomitantly, without it being necessary to proceed with a mixture of several different adsorbent materials and / or without it being necessary to implement several superimposed beds of adsorbents or installed in a series of columns of different adsorbents, and without it being essential to resort to a qualitative and / or quantitative analysis of the impurities to be removed.

[0012] Another objective is to propose a versatile adsorbent material capable of removing impurities and pollutants from gases resistant to existing treatments by a treatment on a single bed of versatile adsorbent material for the treatment of said pollutants.

[0013] Another objective is to provide a versatile and effective adsorbent material for removing a large number of different impurities, without the need to adjust / modify the nature of said versatile adsorbent material according to the impurities to be removed, the ultimate objective being to be able to provide a universal versatile adsorbent material. Further objectives will become apparent in the description of the present invention that follows.

[0014] The inventors have now discovered that the aforementioned objectives can be achieved in whole or at least in part, thanks to the present invention which relates to the use of a versatile zeolite adsorbent material, which material comprises at least two zeolites and possibly other adsorbent materials.

[0015] Thus, and according to a first aspect, the present invention relates to the use, for gas treatment, of an adsorbent material comprising:

[0016] A) at least one zeolite selected from LTA type zeolites and FAU type zeolites, FAU type zeolites having a Si / Al molar ratio between 1 and 3, inclusive,

[0017] B) at least one zeolite selected from FAU type zeolites with a Si / Al molar ratio between 3 and 30, excluding limits, MFI type zeolites and *BEA type zeolites, and

[0018] C) at least one agglomeration binder.

[0019] Gas treatment refers to the removal of impurities present in gaseous matrices of all kinds and natures, for example, but not limited to, gases, gas streams, industrial gas streams, combustion gases, but also air, ambient air, polluted air, stale air, and others. The application according to the present invention is particularly suitable for the general depollution of air, ambient air, polluted air, stale air, and others.

[0020] The impurities, pollutants, or contaminants that can be removed through the use of the adsorbent material according to the invention are well known to those skilled in the art and include, by way of non-limiting examples, volatile organic compounds (VOCs), carbon dioxide (CO2), various organic molecules such as aldehydes, ketones, aromatic compounds, phenols, nitrosamines, halogenated, chlorinated, and / or fluorinated compounds, perfluoroalkyl substances (PFAs), in particular short-chain PFAs, but also branched ethers such as, by way of non-limiting examples, methyl tert-butyl ether (MTBE), rethyl tert-butyl ether, ter-amyl methyl ether, mercaptans, and others, as well as complex organic compounds, such as viruses and others, to name only the most commonly encountered contaminants.

[0021] The contaminants of gas treated through the use of the present invention can thus be easily and efficiently eliminated, which means in particular that the levels of impurities to be eliminated and after use of the adsorbent material according to the invention are advantageously zero or at least below the limits of detection of said impurities.

[0022] Among FAU type zeolites with a Si / Al molar ratio between 1 and 3 inclusive, LSX, MSX, X and Y zeolites are preferred, preferably chosen from among X and Y zeolites. Among LTA type zeolites, 4A and 5A zeolites are preferred, preferably LTA-5A zeolites.

[0023] Among zeolites with a Si / Al molar ratio strictly greater than 3, preference is given to those chosen from among FAU type zeolites with a Si / Al molar ratio strictly greater than 3 and less than or equal to 30, MFI type zeolites and *BEA type zeolites.

[0024] Among FAU type zeolites with a Si / Al molar ratio between 3 and 30, ratios between 4 and 30 are preferred, preferably between 4 and 20, even better between 5 and 15, and advantageously between 5 and 8, and in particular FAU-Y type zeolites having undergone one or more desalumination treatments according to any method well known to those skilled in the art.

[0025] Among MFI type zeolites, preferred are MFI zeolites with a Si / Al ratio between 10 and 50, preferably 12 to 40 inclusive, and also MFIs with a Si / Al ratio between 100 and 800, preferably 100 to 300 inclusive, as well as purely silicic MFIs, for example Silicalite-1.

[0026] According to one embodiment, the adsorbent material usable within the scope of the present invention may further comprise one or more of the adsorbent species selected from: • porous materials based on carbon, such as activated carbons and carbon molecular sieves; • diatomaceous earth; • metal oxides, typically transition metal oxides, including mixed oxides, for example zinc, iron, titanium, copper, zirconium, manganese, silver oxides and their combinations; • zeolites of the CHA, HEU, MOR, MEL, LTL type; • zeotypes such as, for example, aluminophosphates, titano- silicates, porous organic and / or organometallic materials, including MOFs (Metal Organic Frameworks) such as ZIFs (Zeolitic Imidazolate Framework), COF (Covalent Organic Framework), and others; and • mesoporous silicas, such as for example those chosen from SBA, MCM, in particular MCM-41.

[0027] In the present invention, it must be understood that all the terms mentioned concerning "zeolites" and "porous materials" encompass the hierarchically porosity homologues of said zeolites and porous materials, that is to say the homologues having pores at several scales: micropores (less than 2 nm), mesopores (2 nm to 50 nm) and sometimes macropores (more than 50 nm).

[0028] It should also be understood that the zeolites present in the versatile adsorbent material usable within the framework of the present invention include related zeolites, that is to say zeolites which have similar structures and contain other chemical elements, such as iron, zinc and titanium, in addition to the aluminum and silicon which constitute the framework of the zeolitic structure.

[0029] The versatile adsorbent material suitable for use with the present invention generally and most often comprises one or more metals, which may be present in the form of cations, in particular in the form of exchangeable cations or present in metallic form or in the form of oxides, and in this case most often in clusters.

[0030] In a preferred embodiment, the zeolites included in the multipurpose adsorbent material comprise one or more cations most often chosen from among the hydronium, sodium, calcium, lithium, barium, potassium, magnesium, iron, zinc, copper, silver, titanium, manganese, cobalt cations.

[0031] Generally speaking, versatile adsorbent materials are preferred for which the mass ratio component A) / component B) is between 1 / 9 and 9 / 1, preferably between 1 / 6 and 6 / 1, for example between 1 / 2 and 2 / 1, these ratios being understood inclusive.

[0032] Component C) of the multipurpose adsorbent material of the invention is an agglomerating binder that enables the cohesion of components A) and B) in order to make the multipurpose adsorbent material manageable. The agglomerating binder can be of any type well known to those skilled in the art of adsorbent materials, particularly zeolitic adsorbent materials. Non-limiting examples of agglomerating binders include natural, synthetic, or artificial clays, and in particular clays selected from kaolin, kaolinite, nacrite, dickite, halloysite, attapulgite, sepiolite, montmorillonite, bentonite, illite, and metakaolin, as well as mixtures of two or more of them in any proportion. Clays usable as an agglomerating binder for the multipurpose adsorbent material of the invention can also be delaminated clays.

[0033] The binders usable within the framework of the present invention may also include aluminas, silica including silica sols, silicates, and others, as well as mixtures of two or more of these agglomeration binders.

[0034] The agglomeration binder C) of the multipurpose adsorbent material of the invention can be zeolithized, in whole or at least in part. For zeolithization techniques, reference may be made in particular to the work of DW Breck “Zeolite Molecular Sieves”, a Wiley Interscience Publication, (1974), pp. 731 ff.

[0035] The quantity of component C), which is preferably an agglomeration binder, is most often between 0.1% and 60% by weight, preferably between 0.1% and 40% by weight, preferably again between 0.1% and 20% by weight, inclusive of terminals, relative to the total weight of the multipurpose adsorbent material.

[0036] The versatile adsorbent material usable within the framework of the present invention can be prepared according to all conventional methods well known to those skilled in the art for preparing adsorbent materials and in particular agglomerated adsorbent materials, such as those described in patent EP2152402.

[0037] In one embodiment, the process for preparing the multipurpose adsorbent material suitable for use with the present invention comprises at least one step of mixing components A), B) and the other porous material(s) mentioned above, then at least one step of mixing and agglomerating, or directly agglomerating the previously obtained mixture, with the agglomeration binder C), then optionally at least one shaping step if desired or desired and finally at least one activation step.

[0038] All these steps are well known to those skilled in the art. The mixing of components A), B), and possibly the other porous material(s), is generally and most often a mixture of solids, in the form of powders or crystals. The mixing can be carried out by any means known per se, according to methods well known to those skilled in the art and described in the scientific literature, patents, and on the internet.

[0039] The process for preparing the multipurpose adsorbent material may further include one or more impregnation and / or ion exchange steps to effect a change in polarity, and / or one or more degradation steps by acid, base, or chelating treatment to impart to the material specific adsorption properties based on affinity / polarity, sterility / exclusion, and other factors. Furthermore, the multipurpose adsorbent material defined above may exhibit highly desirable catalytic properties, particularly under the action of the metal(s) contained in said material.

[0040] It may indeed be advantageous, desirable, or even necessary to carry out one or more impregnation or exchange operations (absorption type), particularly in the purpose of modifying the polarity, and / or one or more degradation steps by acid, basic or chelating treatment, in order to give the agglomerate particular catalytic or adsorption properties by affinity / polarity, sterility / exclusion.

[0041] The chemical impregnation and / or exchange treatment can be carried out before or after the agglomeration step with the agglomeration binder, on at least one of the porous materials used or on the mixture of one or more, or even all of the porous materials included in the multipurpose adsorbent material of the invention.

[0042] It should be understood that the various zeolites present in the multipurpose adsorbent material for water treatment may contain one or more cations selected from among the hydronium cation, alkali metal cations (preferably sodium, potassium), alkaline earth metal cations (preferably Mg, Ca), and transition metal cations (preferably Zn, Fe, Cu). According to a preferred embodiment, the metals, generally in metallic form or as oxides, and preferably as oxides, possibly present in the multipurpose adsorbent material are preferably oxides selected from palladium, zinc, iron, copper oxides, as well as mixtures of two or more of these oxides.

[0043] In a preferred embodiment of the invention, when the zeolitic adsorbent material comprises an MFI type zeolite, the latter is advantageously chosen from the group of MFI type zeolites comprising one or more cations chosen from Na, Li, Ca, hydroniums.

[0044] In another preferred embodiment of the invention, the zeolite adsorbent material comprises a type 5A zeolite and an MFI zeolite with a Si / Al ratio between 12 and 50, or alternatively a type 5A zeolite, an MFI zeolite with a Si / Al ratio between 12 and 50 and a *BEA zeolite, agglomerated with an alumina or clay-type binder.

[0045] In another preferred embodiment of the invention, the zeolite adsorbent material comprises a type 5A zeolite and a FAU Y zeolite with a Si / Al ratio greater than 3, or a type 5A zeolite, a FAU Y zeolite with a Si / Al ratio greater than 3 and an MFI zeolite with a Si / Al ratio between 12 and 50, or a type 5A zeolite, a FAU Y zeolite with a Si / Al ratio greater than 3, an MFI zeolite with a Si / Al ratio between 12 and 50 and a *BEA zeolite, agglomerated with an alumina or clay-type binder.

[0046] In another preferred embodiment of the invention, the zeolite adsorbent material comprises a FAU NaX or FAU NaY type zeolite with a Si / Al ratio < 3 and an MFI zeolite with a Si / Al ratio between 12 and 50, or alternatively, a FAU NaX or FAU NaY type zeolite with a Si / Al ratio < 3, an MFI zeolite with a Si / Al between 12 and 50 and a zeolite *BEA, agglomerated with an alumina or clay type binder.

[0047] After mixing the various solid components, the multipurpose adsorbent material is shaped according to any method well known to those skilled in the art and, for example and without limitation, by means of shaping processes by extrusion, pelletizing, agitation and collisions, making it possible to achieve the desired shapes and sizes.

[0048] Thus, the versatile adsorbent material of the present invention can be in all forms well known to those skilled in the art and for example in the form of solids such as beads, yarns, solid or hollow extrudates, trilobes, quadrilobes, tablets, pellets, granules, film-coated solids, core-shell, and others.

[0049] The versatile adsorbent material, whether in the form of beads, extrudates or other, most often and generally has an average volumetric diameter, or an average length (largest dimension when not spherical), of between 0.05 mm and 10 mm, preferably between 0.1 mm and 10 mm, even more preferably between 0.2 mm and 10 mm.

[0050] In an even more preferred embodiment, the versatile adsorbent material has an average volumetric diameter of between 0.3 mm and 5 mm, considering the smallest dimension of the agglomerate, and between 0.3 mm and 10 mm, considering the largest dimension of the agglomerate.

[0051] In one embodiment of the invention, the versatile adsorbent material advantageously has a size between 0.3 mm and 5 mm (considering the smallest dimension of the material) and between 0.3 mm and 10 mm (considering the largest dimension of the material).

[0052] According to a preferred embodiment of the present invention, the multipurpose adsorbent material described above most often exhibits the following mechanical properties: • either a bed crush resistance (REL) measured according to ASTM 7084-04 of between 1 MPa and 5 MPa, preferably between 1.5 MPa and 5 MPa, preferably even more preferably between 2 MPa and 5 MPa, for a material of average volume diameter (d50) or length (largest dimension when the material is not spherical), less than 1 mm, inclusive of terminals, • either a grain crush resistance, measured according to ASTM D 4179 (2011) and ASTM D 6175 (2013), of between 0.5 daN and 30 daN, preferably between 1 daN and 20 daN, preferably still between 2 daN and 10 daN, for a material of average volume diameter (d50) or length (largest dimension when the material is not spherical), greater than or equal to 1 mm, inclusive.

[0053] It is also preferred, within the scope of the present invention, that the multipurpose adsorbent material exhibits water resistance suitable for its intended uses, that is to say, good or even very good geometric and mechanical stability over time, particularly when the multipurpose adsorbent material is in contact with water vapor. Within the scope of the present invention, the multipurpose adsorbent material exhibits suitable water resistance when it has a resistance to disintegration typically greater than 80%, preferably greater than 90%.

[0054] Resistance to disintegration is easily measured by a boiling disintegration test, which can be carried out by immersing a 50 g sample of versatile adsorbent material of known particle size in 400 mL of boiling water for 5 min. The supernatant is then removed by decantation, and the versatile adsorbent material is then gradually dried to 350°C (2-hour holding period). The cycle is repeated three times. Resistance to disintegration is obtained by sieving and weighing and is expressed as the mass percentage of sieves still within the initial particle size range.

[0055] The versatile adsorbent material just defined finds applications in a wide range of fields thanks to its high adsorption capacity for multiple molecules and, according to the invention, a particularly interesting use for the purification of gases, gas streams, industrial gas streams, combustion gases, but also air, ambient air, polluted air, stale air, and other types of air. The use according to the present invention is particularly suited to the general depollution of air, ambient air, polluted air, stale air, and other types of air, and more specifically for air purification.

[0056] The use according to the present invention is particularly aimed at the treatment / purification of air, for example in confined environments. By treatment / purification, we most often mean, but not exclusively, the elimination of odors, the elimination of volatile organic compounds, the purification of streams from recycling operations, chemical, mechanical, physical, or organic recycling (fermentation, composting, enzymatic digestion, and others), from cracking operations, and in particular from chemical recycling and / or cracking of plastics, but also for the purification of streams in the food industry, in the field of packaging, as well as the treatment of vapors extracted from polluted soils.

[0057] The invention also relates to a method for treating a contaminated gas, said method comprising at least the following steps: a) optional pretreatment of said contaminated gas, b) contacting the gas from step a) with at least one versatile adsorbent material as defined above, and c) recovery of the purified gas at the end of the previous step.

[0058] Typical examples of contaminated gases that can be used in the process of the present invention include, but are not limited to, gases contaminated by one or more contaminants, preferably several contaminants, selected from, by way of non-limiting example, volatile organic compounds (VOCs), carbon dioxide (CO2), various organic molecules such as aldehydes, ketones, aromatic compounds, phenols, nitrosamines, halogenated, chlorinated and / or fluorinated compounds, perfluoroalkyl substances (PFAs), in particular short-chain PFAs, but also branched ethers such as, by way of non-limiting example, methyl tert-butyl ether (MTBE), rethyl tert-butyl ether, ter-amyl methyl ether, mercaptans, and others, as well as complex organic compounds, such as viruses and others, to name only the most common contaminants met.

[0059] In a preferred embodiment of the invention, and as previously stated, the contaminated gas is a gas from confined spaces, a gas resulting from recycling operations, chemical, mechanical, physical, or organic recycling (fermentation, composting, enzymatic digestion, and others), a gas resulting from cracking operations, and in particular from chemical recycling and / or cracking of plastics, but also a gas present in the food industry, in the field of packaging. The term "gas" is understood generally to mean any gas, but also air, ambient air, and others, as previously stated.

[0060] According to the process of the present invention, it should be understood that the gas to be treated may have previously undergone one or more treatments well known to those skilled in the art and, for example, and in a non-limiting manner, one or more treatments chosen from among dust removal, water washing, washing with one or more solvents, treatment by de-essifier, to name only the most common "pre-treatments", not forgetting one or more pre-treatment(s) on activated carbon.

[0061] By contacting, we mean all known processes of gas flow treatment such as pressure-modulated adsorption (PSA), temperature-modulated adsorption (TSA), treatment on absorbing wheels, treatment by membrane separation, and others, to name only the most common and well-known treatments.

[0062] The process can be carried out at any temperature, as is well known to those skilled in the art. Most often and generally, the process is carried out at ambient temperature for obvious reasons of economy (either heating or cooling), but the process can be carried out at any temperature where the waters and various effluents to be treated are in a liquid state, and advantageously at a temperature between 0°C and a temperature less than or equal to 110°C.

[0063] Due to its versatile adsorption properties, the material used in the context of the present invention allows for the simultaneous treatment of numerous contaminants, thus avoiding the need to associate a specific type of contaminant with a particular adsorbent structure. This avoids the need for a succession of different adsorbents or numerous successive or sequential treatments, the order of which is often difficult to determine and optimize. The versatile adsorbent material of the invention is therefore particularly well-suited to the treatment and purification of gases containing various unspecified and / or unidentified impurities.

[0064] The versatile adsorbent material is therefore particularly interesting when the nature of said impurities (or contaminants) is not known or is known incompletely, thus simplifying, or even avoiding, preliminary steps of chemical analyses which are often complex and therefore long and costly.

[0065] In the process of the invention, the versatile adsorbent material can advantageously be used in one, or even two or more, columns of adsorbent beds. The versatile adsorbent material can also be used in combination or in mixture with other known adsorbents, for example with activated carbons, either in two-layer adsorbent beds or two adsorbent beds in series, with the activated carbon representing a first treatment and the versatile adsorbent material described above representing a subsequent treatment. It is also possible for the process to be a multi-layer process, provided that at least one of the layers comprises the versatile adsorbent material defined above.

[0066] The present invention is illustrated by means of the following examples, which are not intended to limit the scope of protection sought, the scope of protection being defined by the claims annexed to this description.

[0067] The physical properties of the multipurpose adsorbent material of the invention are evaluated by methods known to those skilled in the art, the main ones of which are recalled below. Particle size of the multipurpose adsorbent material

[0068] The determination of the average volume diameter (or "average volume diameter") of the zeolitic adsorbent material of the process according to the invention is carried out by analyzing the particle size distribution of a sample of adsorbent material by imaging according to ISO 13322-2:2006, using a conveyor belt allowing the sample to pass in front of the camera lens.

[0069] The average volume diameter is then calculated from the particle size distribution by applying ISO 9276-2:2001. In this document, the term "average volume diameter" or "size" is used for the Zeolitic adsorbent materials. The accuracy is on the order of 0.01 mm for the size range of adsorbent materials useful within the scope of the present invention.

[0070] Identification of the components of the multipurpose adsorbent material:

[0071] The identification of the different components of the material of the invention, as well as the molar ratios Si / Al are evaluated by X-ray diffraction analysis, known to those skilled in the art under the acronym DRX, supplemented by elemental chemical analysis by ICP and / or X-ray fluorescence, by solid-state NMR analysis, and SEM-EDX analysis.

[0072] The X-ray fluorescence chemical analysis technique is described in standard NF EN ISO 12677:2011 on a wavelength-dispersive X-ray spectrometer (WDXRF). Elemental chemical analysis by ICP is performed by high-frequency induced plasma atomic emission spectrometry (ICP-AES) and described in standards NF EN ISO 21587-3 or NF EN ISO 21079-3.

[0073] Composition examples The following multipurpose adsorbent materials 1 to 6, usable within the scope of the present invention, are prepared as follows: the various components are introduced as dry powders and mixed dry in a kneading-type arm mixer. Water is then added to the mixture until a paste is formed. The paste is then extruded and cut to form extrudates 1.6 mm in diameter. The extrudates are then dried at 80°C for 8 hours and subsequently activated at 550°C for 2 hours. Unless otherwise stated, percentages are weight percentages, expressed on the anhydrous materials, i.e., after deducting the loss on ignition after heating at 950°C for 4 hours. Multipurpose adsorbent material 1:

[0074] Component A, 30% FAU type Y zeolite (Arkema), Si / Al ratio: 2.0; Component B, 30% MFI type ZSM5 zeolite (Arkema), Si / Al ratio: 14; Component, 15% clay: ATTAPULGITE MIN-U-Gel (Active Minerals, Inc.); Other component, 25% activated carbon (Chemviron SA)

[0075] Multipurpose adsorbent material 2: Component A, 8% LT A zeolite (5 A NK20 Arkema), Si / Al ratio: 1.0; Component B, 56% FAU type Y zeolite (CBV 712 Zeolyst - ammonium), Si / Al ratio: 12; Component, 15% clay: defibrated attapulgite Actigel-208 (Active Minerals, Inc.); Other component, 21% palladium-impregnated activated carbon (Chemviron SA)

[0076]

[0077] Versatile adsorbent material 3: Component A, 22% FAU type X zeolite (Arkema), Si / Al ratio: 1.25; Component B, 44% MFI type ZSM5 zeolite (Arkema), Si / Al ratio: 17; Component C, 20% sepiolite clay (Sepiolsa); Other component, 14% activated carbon (Chemviron SA), 7% palladium-impregnated mordenite (Arkema); Adsorbent material wly valent 4: Component A, 35% FAU type X zeolite (Arkema), Si / Al ratio: 1.25; Component B, 35% BEA* zeolite (Zeolyst), Si / Al ratio: 150; Component, 15% Actigel-208 defibrated attapulgite clay (Active Minerals, Inc.); Other component, 15% - Copper-impregnated chabazite (Arkema), 5% - Iron-impregnated MFI (Arkema), 5% - Silver-impregnated MFI (Arkema), 5%

[0078] Versatile adsorbent material 5: Component A, 64% FAU zeolite type MSX (Arkema), Si / Al ratio: 1.15 Component B, 21% FAU zeolite type Y (CBV 780 Zeolyst - H), Si / A ratio 1:80 Component, 15% - kaolin, 10% (Imerys), - sodium silicate, 5% (PQ Corp.)

[0079] Versatile adsorbent material 6: Component A, 12.5% ​​FAU type Y zeolite (Arkema), Si / Al ratio: 1.5; Component B, 62.5% Silicalite-1 zeolite (Arkema), Si / Al ratio: 0; Component, 15% alumina (Alcoa); Other component, 10% - silver oxide (AgO), 5% (Sigma Aldrich) - zinc oxide (ZnO), 5% (Sigma Aldrich)

Claims

Demands

1. Use, for gas treatment, of an adsorbent material comprising: A) at least one zeolite selected from LTA type zeolites and FAU type zeolites, FAU type zeolites having a Si / Al molar ratio between 1 and 3, inclusive, B) at least one zeolite selected from FAU type zeolites with a Si / Al molar ratio between 3 and 30, excluded, MFI type zeolites and *BEA type zeolites, and C) at least one agglomeration binder.

2. Use according to claim 1, wherein FAU type zeolites of Si / Al molar ratio between 1 and 3, inclusive, are selected from LSX, MSX, X and Y zeolites, preferably from X and Y zeolites.

3. Use according to claim 1 or claim 2, wherein LTA type zeolites are selected from 4A and 5A zeolites.

4. Use according to any one of the preceding claims, wherein the zeolites of Si / Al molar ratio strictly greater than 3 are selected from FAU type zeolites of Si / Al molar ratio strictly greater than 3 and less than or equal to 30, preferably of a ratio between 4 and 30, preferably between 4 and 20, better still between 5 and 15, and advantageously between 5 and 8.

5. Use according to any one of the preceding claims, wherein the MFI type zeolites are selected from MFI zeolites with a Si / Al ratio of 10 to 50, preferably 12 to 40 inclusive, and also MFIs with a Si / Al ratio of 100 to 800, preferably 100 to 300 inclusive, as well as purely silicic MFIs, for example Silicalite-1.

6. Use according to any one of the preceding claims, wherein the adsorbent material further comprises one or more of the adsorbent species selected from: • Porous materials based on carbon, such as activated carbons and carbon molecular sieves; • Diatomaceous earths; • Metal oxides, typically transition metal oxides, including mixed oxides, for example zinc, iron, titanium, copper, zirconium, manganese, silver oxides and their combinations; • Zeolites of the CHA, HEU, MOR, MEL, LTL type; • Zeotypes such as aluminophosphates, titanosilicates, organic and / or organometallic porous materials, including MOFs (Metal Organic Frameworks) such as ZIFs (Zeolitic Imidazolate Frameworks), COFs (Covalent Organic Frameworks), and others; and • Mesoporous silicas, such as those selected from SBAs, MCMs, in particular MCM-41.

7. Use according to any one of the preceding claims, wherein the zeolites included in the adsorbent material comprise one or more cations selected from hydronium, sodium, calcium, lithium, barium, potassium, magnesium, iron, zinc, copper, silver, titanium, manganese, cobalt, and mixtures of two or more of them.

8. Use according to any one of the preceding claims, wherein the adsorbent material comprises a mass ratio component A) / component B) of between 1 / 9 and 9 / 1, preferably between 1 / 6 and 6 / 1, for example between 1 / 2 and 2 / 1, inclusive.

9. Use according to any one of the preceding claims, wherein the quantity of component C) is between 0.1% and 60% by weight, preferably between 0.1% and 40% by weight, preferably again between 0.1% and 20% by weight, inclusive of terminals, relative to the total weight of the adsorbent material.

10. Use according to any one of the preceding claims, wherein the adsorbent material comprises a type 5A zeolite and an MFI zeolite with a Si / Al ratio of between 12 and 50, or another 5A type zeolite, an MFI zeolite with a Si / Al ratio between 12 and 50 and a *BEA zeolite, agglomerated with an alumina or clay type binder.

11. Use according to any one of claims 1 to 9, wherein the adsorbent material comprises a type 5A zeolite and a FAU Y zeolite of Si / Al ratio greater than 3, or a type 5A zeolite, a FAU Y zeolite of Si / Al ratio greater than 3 and an MFI zeolite of Si / Al ratio between 12 and 50, or a type 5A zeolite, a FAU Y zeolite of Si / Al ratio greater than 3, an MFI zeolite of Si / Al ratio between 12 and 50 and a *BEA zeolite, agglomerated with an alumina-type or clay-type binder.

12. Use according to any one of claims 1 to 9, wherein the adsorbent material comprises a FAU NaX or FAU NaY type zeolite with a Si / Al ratio < 3 and an MFI zeolite with a Si / Al ratio between 12 and 50, or a FAU NaX or FAU NaY type zeolite with a Si / Al ratio < 3, an MFI zeolite with a Si / Al ratio between 12 and 50 and a *BEA zeolite, agglomerated with an alumina or clay-type binder.

13. Use according to any one of the preceding claims, for the treatment of gas, gas streams, industrial gas streams, combustion gases, air, ambient air, polluted air, stale air, and preferably for the treatment of air, ambient air, polluted air, stale air, and others.

14. A process for treating a contaminated gas, said process comprising at least the following steps: a) optional pretreatment of said contaminated gas, b) contacting the gas from step a) with at least one adsorbent material according to the process defined in any one of claims 1 to 12, and c) recovery of the purified gas at the end of the preceding step.

15. A method for treating a contaminated gas according to claim 14, wherein the contaminants are selected from volatile organic compounds, carbon dioxide, carbon dioxide, various organic molecules such as aldehydes, ketones, aromatic compounds, phenols, nitrosamines, halogenated, chlorinated and / or fluorinated compounds, perfluoroalkyls, but also branched ethers, mercaptans, complex organic compounds, and others.