329 results about "Adsorption selectivity" patented technology

The invention relates to a preparation method of an amino-functionalized metal organic framework material and application of the prepared material to separation of CO2 / N2 and CO2 / CH4. The preparation method comprises the following steps: dissolving adenine and copper nitrate trihydrate in N, N '-dimethylacetamide to obtain a first mixed solution; dissolving carboxylic acid and potassium carbonate in deionized water to obtain a second mixed solution; and adding the second mixed solution into the first mixed solution, carrying out stirring reaction, and carrying out vacuum drying on an obtained solid product to obtain the amino-functionalized metal organic framework material. The amino-functionalized metal organic framework material prepared by the invention has high CO2 adsorption selectivity and adsorption capacity, and also has good acid-resistant, alkali-resistant and water-resistant stability. The amino-functionalized metal organic framework material prepared by the preparation method disclosed by the invention is applied to industrial CO2 adsorption separation and has an excellent separation effect.

The invention provides a nitrogen-rich organic molecule modified graphene oxide composite material as well as a preparation method and application thereof. The method comprises the following steps: adding graphene oxide into a polar organic solvent, and performing ultrasonic dispersion and uniform mixing to obtain a graphene oxide dispersion liquid; the nitrogen-rich organic molecule modified graphene oxide composite material is prepared by the following steps: adding graphene oxide into a reaction kettle, adding 3, 5-diamino-1, 2, 4-triazole, uniformly mixing, carrying out nucleophilic reaction under a weakly acidic heating condition, repeatedly washing a product with ethanol and pure water, and freeze-drying to obtain the nitrogen-rich organic molecule modified graphene oxide composite material, and the composite material is used as an adsorbent, has a stable structure and can efficiently adsorb heavy metal ions. Through modification of the nitrogen-rich organic matter, the adsorbent obtains richer groups and adsorption sites, and can show different adsorption capacities on inorganic metal cations through multiple adsorption mechanisms. An adsorption result shows that the adsorbent has excellent adsorption selectivity on low-concentration copper ions in an aqueous solution. Through multiple adsorption-desorption experiments, the composite material still shows excellent reutilization performance.

The invention relates to a phenolic resin modified carbon molecular sieve and a preparation method and application thereof, and belongs to the technical field of adsorbents. The technical problem to be solved by the invention is to provide the phenolic resin modified carbon molecular sieve, and the adsorption selectivity is improved. The method comprises the following steps: a, in-situ polymerization: mixing phenolic resin polymerization mother liquor with a carbon molecular sieve, standing for adsorption, and heating the adsorbed carbon molecular sieve for polymerization reaction to obtain a polymerization product; the phenolic resin polymerization mother liquor comprises a phenolic substance, an aldehyde substance and a solvent; and b, carbonization modification: roasting the polymerization product in a protective atmosphere to obtain the phenolic resin modified carbon molecular sieve. The carbon molecular sieve is modified through phenolic resin in-situ polymerization, and the method is simple, low in cost, high in reaction controllability and suitable for industrial production. The phenolic resin modified carbon molecular sieve has selective adsorbability, can be applied to an N2 / CH4 system, selectively adsorbs N2, and is high in separation ratio and good in stability.

The invention relates to the technical field of water treatment, and provides gel type imidazolyl anion exchange resin as well as a preparation method and application thereof. According to the method, the gel type styrene-divinyl benzene copolymer is taken as a matrix, and the adsorption selectivity of the gel type imidazolyl anion exchange resin on rhenium / technetium is regulated and controlled by grafting imidazole with alkyl side chains with different lengths, so that the removal rate of rhenium / technetium is increased. The gel type imidazolyl anion exchange resin provided by the invention has relatively high adsorption capacity on ReO4 <-> and TcO4 <->, high selectivity, wide applicable pH value and temperature range, strong acid and alkali resistance and irradiation stability, and wide application prospect.

The invention belongs to the field of hydrometallurgy, and particularly relates to a preparation method of a chromium-doped manganese lithium ion sieve and application of the chromium-doped manganese lithium ion sieve in lithium extraction. The preparation method comprises the following steps: by taking a lithium source, a manganese source and a chromium source as raw materials, synthesizing a chromium-doped spinel type lithium ion sieve precursor through a high-temperature solid-phase method, and further performing acid leaching treatment, thereby obtaining the ion sieve with high adsorption selectivity and low manganese solution loss. The method is simple in process and low in cost, and the prepared chromium-doped manganese lithium ion sieve is stable in crystal structure and low in manganese solution loss rate. The developed chromium-doped manganese lithium ion sieve is suitable for efficient extraction of lithium resources of salt lake brine, and a low-cost solution is provided for efficient extraction of the lithium resources of the salt lake.

The invention discloses a phosphorylated ZIF-8 / bamboo charcoal / chitosan-tannic acid composite adsorbent as well as a preparation method and application thereof, and relates to the technical field of uranium-containing wastewater treatment. The preparation method comprises the following steps: stirring bamboo charcoal, a Zn (NO3) 2.6 H2O solution and a 2-methylimidazole solution in a container, and then centrifuging to obtain a precipitate, namely ZIF-8 / bamboo charcoal; the preparation method comprises the following steps: adding tannic acid into a container filled with water, stirring, adding chitosan, ZIF-8 / bamboo charcoal and glacial acetic acid into the container, continuously stirring, adding a glutaraldehyde solution into the container, and carrying out oscillation reaction until sol is aged and freeze-dried to obtain a chitosan-tannic acid cross-linked and cured ZIF-8 / bamboo charcoal composite material; mixing the chitosan-tannic acid cross-linked and cured ZIF-8 / bamboo charcoal composite material and methanesulfonic acid in a container, adding P2O5, stirring, putting into ice water, washing, and drying to obtain the composite adsorbent. The adsorbent has relatively high adsorption selectivity and adsorption capacity on uranium, and is low in dosage and high in stability.

The present invention relates to the technical field of mineral flotation, and in particular to a soft potassium magnesium alum flotation composite reagent and its application. The present invention provides a soft potassium magnesium alum flotation composite reagent, comprising a collector and a frother; the collector comprises R-C6H4NaO3S; R is an alkyl group. The soft potassium magnesium alum flotation composite reagent of the present invention has stronger adsorption selectivity and collection capacity. Under the same dosage, the soft potassium magnesium alum flotation composite reagent has a higher recovery rate and grade of the soft potassium magnesium alum concentrate obtained by flotation, thereby significantly improving the flotation separation efficiency of the soft potassium magnesium alum.

The invention relates to an acylhydrazone bond-connected covalent organic framework material, in particular to an acylhydrazone bond-connected covalent organic framework material as well as a preparation method and application thereof, and aims to overcome the defects of various materials for adsorbing Pd (II) in one aspect or the defects of poor stability and durability in high-acidity and high-radioactivity environments. Or the adsorption selectivity on Pd (II) is not strong. As an emerging crystalline organic porous polymer, the covalent organic framework is mainly formed by connecting pure organic structural units through dynamic covalent bonds, has the advantages of permanent high porosity, low density, high chemical stability, high thermal stability and the like, and is expected to realize Pd (II) adsorption in strong acid and ray irradiation environments.

The invention discloses a nano flower-shaped covalent organic framework material as well as a preparation method, a device and application thereof, and belongs to the field of water treatment. An amino compound and an aldehyde group compound form a covalent organic framework structure with a specific flower-shaped structure under the action of a catalyst and a regulating agent, the covalent organic framework structure continues to react with a carboxyl compound, then metal is loaded, and the nano flower-shaped covalent organic framework material is obtained. Carboxyl in the carboxyl compound responds to uranium in water and does not respond to other metal ions, other interference ions are eliminated, in addition, the carboxyl compound further has sulfydryl which can fix subsequently-loaded metal ions, the loading capacity of the metal ions is improved, and the metal ions can be loaded on the surface of the metal ions in the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface. When the nano flower-shaped covalent organic framework material prepared by the method is used for treating water, uranium ions can quickly reach adsorption sites, and the material as an adsorbent is higher in stability and higher in adsorption selectivity.

The invention relates to a thiourea-based aromatic porous organic polymer as well as a preparation method and application thereof, and belongs to the technical field of functional polymer adsorption materials. The preparation method comprises the following steps: respectively dissolving a plurality of ternary aromatic amine monomers with different electron pushing (electron donating) effects and cheap binary isothiocyanate monomers, mixing, uniformly shaking, and reacting to obtain a porous organic polymer network which is shown as organogel; and grinding the organogel into powder, then carrying out solvent exchange in dichloromethane, treating in methanol by using a Soxhlet extractor, and finally drying to obtain the product. The thiourea-based aromatic porous organic polymer provided by the invention has good adsorptive selectivity to Au, high adsorption capacity, wide pH adaptation range, good cyclic adsorption performance, simple preparation method and relatively high practical application value.

The invention relates to high-pore-volume nitrogen-doped activated carbon for capturing carbon dioxide and a preparation method of the high-pore-volume nitrogen-doped activated carbon, and belongs to the technical field of activated carbon. In order to solve the problem that high nitrogen content and high pore volume of nitrogen-doped activated carbon are not matched, the invention provides a preparation method of high-pore-volume nitrogen-doped activated carbon for carbon dioxide capture. In the preparation process of the activated carbon, an activating medium composed of a carbon source and an activating agent and a nitrogen-containing precursor are respectively laid in different mutually isolated areas in a crucible, so that the carbon deposition effect of the nitrogen-containing precursor is weakened, the high pore volume of the activated carbon is maintained, the nitrogen content of the activated carbon is improved, and the high CO2 adsorption capacity and the high CO2 / N2 adsorption selectivity are obtained at the same time. When the high-pore-volume nitrogen-doped activated carbon prepared by the method is applied to the field of industrial CO2 trapping, high CO2 adsorption capacity can be obtained, and high CO2 purity in desorbed gas can be guaranteed.

The invention belongs to the technical field of adsorption materials, and discloses a modified activated carbon material and a preparation method and application thereof.The preparation method comprises the following steps that 1, an oxidizing agent solution is added into cleaned and dried activated carbon, heating modification is conducted, then the activated carbon is taken out, the oxidizing agent solution and impurities remaining in pores of the activated carbon are removed through washing, and drying is conducted to obtain modified activated carbon; pre-treated activated carbon is obtained; and 2) placing the pretreated activated carbon in a methyl acrylate atmosphere, then taking out the pretreated activated carbon, spraying a photoinitiator solution on the surface of the pretreated activated carbon, carrying out ultraviolet irradiation, and drying after the irradiation is finished to obtain the modified activated carbon material. According to the invention, the oxygen-containing functional group and the methyl acrylate oligomer are introduced on the surface of the activated carbon, so that the adsorption selectivity and the adsorption capacity on the acrylate VOC are enhanced, and the modified activated carbon material is suitable for efficient removal of various acrylate VOCs and has a wide application prospect.

The invention discloses a simulated screening and process optimization method of an anhydrous hydrogen fluoride desulfurization adsorbent, and relates to the technical field of anhydrous hydrogen fluoride, and the method comprises the following steps: constructing a database, and establishing a basic screening library; constructing an intelligent screening engine, and performing force field parameter correction on the materials in the basic screening library to capture a high-polarity solvent effect; calculating and extracting adsorption selectivity, Henry coefficients and working capacity indexes, and screening out a primary candidate material set; a core candidate material is optimized; determining an optimal adsorbent model; the microscopic adsorption data of the optimal adsorbent model are converted into macroscopic process parameters, the macroscopic process parameters are imported into a macroscopic process simulator for prediction, and process optimization is completed. According to the method, the strong polar solvent effect is simulated by constructing the corrected force field environment, and high-throughput screening of the adsorption materials is achieved in combination with an active learning strategy; an electronic grade refinement and modification strategy is utilized to optimize adsorption sites, and microcosmic adsorption data and a macroscopic mass transfer model are coupled to realize accurate prediction and optimization of an adsorption process.

The present application relates to a kind of phosphine oxy group covalent modification composite adsorption material and its preparation method and purposes, the preparation method includes the following steps: (1) mixing dopamine hydrochloride, phosphine-containing substrate, tris-hydroxymethyl aminomethane hydrochloride and sodium hydroxide in solvent, to obtain mixed solution;(2) the mixed solution obtained in step (1) and solid phase material are mixed, then oscillation reaction is carried out, to obtain solid-liquid mixture;(3) the solid-liquid mixture obtained in step (2) is carried out solid-liquid separation, and the solid phase part obtained is sequentially washed and dried, to obtain phosphine oxy group covalent modification composite adsorption material.The phosphine oxy group covalent modification composite adsorption material provided by the present application has excellent adsorption selectivity and material stability, and can be used for the high-selectivity separation and recovery of rare metals indium and gallium.

The invention discloses a carboxyl-functionalized porous organic polymer, a preparation method thereof and application of the carboxyl-functionalized porous organic polymer in ammonia gas adsorption separation and sensing. The polymer is obtained by free radical polymerization, hydrolysis and acidification of monomers containing vinyl and ester groups, and has a mesoporous structure and a skeleton carboxyl functional group. The preparation method is simple and mild in condition. The polymer has excellent adsorption selectivity and high adsorption capacity on ammonia gas, the static adsorption capacity on the ammonia gas under the conditions of 298 K and 1 bar is not lower than 6.5 mmol / g, the ammonia gas can be efficiently separated from NH / N / H and NH / COs mixed gas, and the cycling stability is good. An ammonia gas sensor prepared by taking the graphene oxide as a sensitive material has linear or piecewise linear response to ammonia gas with the concentration of 1-100 ppm at room temperature, the detection limit is lower than 30 ppb, and the selectivity is excellent. The invention overcomes the defects of the existing ammonia gas adsorption separation material and sensor, has important significance for optimizing the ammonia production process and reducing pollution, and has wide application prospects.

The invention relates to the technical field of environmental engineering, and particularly discloses an underground water remediation and activity monitoring system based on a zero-valent iron-based nano material, which comprises composite nano particles consisting of a zero-valent iron core, a ferrous sulfide / humic acid dynamic compensation layer and a temperature-sensitive polymer, through a crack self-adaptive regulation and control module driven by a sensor array and a temperature difference driving migration module based on an underground water temperature gradient, the system can realize automatic circulation of selective adsorption, desorption and degradation of pollutants under different temperature conditions through the combined action of a phase change behavior of a temperature-sensitive polymer and a dynamic compensation layer; the stability and the repair efficiency of the nanoparticles are improved; compared with a traditional scheme, the method has the advantages that on-demand response activity adjusting capacity and an accurate injection path guiding mechanism are achieved, the technical bottlenecks that in the groundwater heterogeneous environment, migration of a repairing agent is uncontrollable, and adsorption selectivity is poor are avoided, and good engineering adaptability and practical application prospects are achieved.

The invention relates to an adsorbent based on an X molecular sieve and preparation and application thereof, and a preparation method of the adsorbent comprises the following steps: (1) mixing the X molecular sieve with a binder, molding and roasting to obtain a molded body; (2) treating the molded body obtained in the step (1) with an alkali solution to perform in-situ crystallization on the binder in the molded body to obtain a crystallized product; (3) carrying out partial barium ion exchange on the crystallized product obtained in the step (2) by using a barium salt solution, and drying to obtain a dried product; (4) carrying out ammonium ion exchange on the dried product obtained in the step (3) by using an ammonium salt solution, and roasting in a flowing atmosphere to obtain a roasted product; and (5) performing barium ion exchange and optional potassium ion exchange on the roasted product obtained in the step (4), and then drying to obtain the adsorbent. The adsorbent has at least two kinds of mesoporous channels with different apertures, has high barium ion exchange capacity, high adsorption capacity and compressive strength, and shows good adsorption selectivity and mass transfer performance when used for adsorption separation of p-xylene.

The invention relates to application of a covalent organic framework material in preparation of a blood perfusion adsorbent, and the covalent organic framework material not only can adsorb toxins in blood with high adsorption capacity, but also has the advantages of excellent adsorption selectivity, low hemolysis rate, protein adhesion resistance and the like.

The invention discloses a molecularly imprinted adsorption material taking a metal organic framework as a carrier skeleton as well as a preparation method and application of the molecularly imprinted adsorption material, and belongs to the technical field of adsorption materials. The preparation method comprises the following steps: carrying out hydrothermal reaction on transition metal salt and a phthalic acid ligand to obtain metal organic framework nanoparticles; the preparation method comprises the following steps: adsorbing flavonoid template molecules by metal organic framework nanoparticles, mixing with lysozyme and a disulfide bond reducing agent, performing phase change polymerization, and eluting to remove the flavonoid template molecules after the phase change polymerization is completed, thereby obtaining the molecularly imprinted adsorbing material with abundant imprinting sites and good stability. The adsorbent is good in flavonoid compound adsorption selectivity, high in rate, large in capacity, good in chemical stability, resistant to acid washing, capable of being recycled for multiple times and capable of being widely applied to extraction and separation of flavonoid compounds.

The invention discloses a carbon-based polycyclic aromatic hydrocarbon adsorbent and a preparation method and application thereof.The preparation method comprises the steps that firstly, a mixture of a pretreated coconut shell material and a modifier is subjected to high-temperature treatment to obtain a carbonized material, then the carbonized material is immersed in an activating solution to be subjected to low-temperature treatment, and then filtering, washing to be neutral and drying in the shade at the room temperature are conducted to obtain the carbon-based polycyclic aromatic hydrocarbon adsorbent. Carrying out secondary high-temperature treatment to obtain an activated material; and crushing and sieving the activated material to obtain the carbon-based polycyclic aromatic hydrocarbon adsorbent. The carbon-based polycyclic aromatic hydrocarbon adsorbent has obvious advantages in the selective adsorption and removal process of polycyclic aromatic hydrocarbon, silicon species are introduced in the carbonization process, a microporous structure in a carbon material is destroyed in a pillared mode, then the pore structure of the catalyst is regulated and controlled, the mesoporous structure is richer, and the adsorption selectivity of the polycyclic aromatic hydrocarbon is improved; the adsorbent has high adsorption capacity and adsorption selectivity.

The invention relates to a micropore-mesopore X molecular sieve, which is measured by a nitrogen physical adsorption method, the micropore specific surface area is 450-640m < 2 > / g, the mesopore specific surface area is 20-50m < 2 > / g, the pore size distribution curve shows at least two mesopore distribution peaks, the most probable pore size corresponding to one mesopore distribution peak is in the range of 3.0-7.0 nm, and the most probable pore size corresponding to the other mesopore distribution peak is in the range of 3.0-7.0 nm. And the most probable pore diameter corresponding to the other mesoporous distribution peak is in the range of 10.0-19.0 nm. The molecular sieve has good mass transfer performance and high aromatic hydrocarbon adsorption selectivity.

The invention discloses a coal bed gas exploitation and separation utilization method based on SCCO2 assistance, and belongs to the technical field of coal bed gas development. Supercritical carbon dioxide is prepared through a high-pressure reaction kettle and stored in a supercritical carbon dioxide storage and collection tank, meanwhile, nitrogen mixed with graphene is introduced, and CO2 / CH4 adsorption selectivity is enhanced by means of the characteristic that the specific surface area of graphene is large. A variable-frequency sound wave diffuser is matched to excite coal seam micro cracks through low-frequency sound waves, and supercritical carbon dioxide and nitrogen mixed gas is injected into a coal seam injection well. In the injection process, the sound wave diffuser synchronously radiates high-frequency sound waves to improve the displacement efficiency, then the gas enters the gas separation tower integrated with the molecular sieve membrane, and the produced gas is divided into upper methane, middle carbon dioxide and other bottom miscellaneous gas. Methane is pressurized by an air compressor and then stored in a methane storage tank, carbon dioxide is purified and pressurized and then recycled for coalbed methane exploitation, and offensive gas is cooled and stored after generating power by a steam turbine. And efficient mining, separation and multi-path utilization of the coal bed gas are realized.

The invention relates to a calcium-based desulfurizer and a preparation method and application thereof, and relates to the technical field of desulfurizers, the calcium-based desulfurizer comprises a calcium-based carrier with a micropore-mesopore-macropore three-level pore structure, and a gamma-aminopropyltriethoxysilane modifier dispersed in pore channels, the molecular imprinting layer is modified by an inactive region on the inner wall of the mesoporous; the preparation method comprises the steps of calcium-based carrier pretreatment, composite pore forming, pre-roasting, hydroxyl strengthening and the like. The efficient mass transfer system is constructed through a three-stage pore structure, the modifier and the molecular imprinting layer synergistically improve the structural stability and the sulfur dioxide adsorption selectivity, the calcium base utilization rate and the desulfurization efficiency are improved, and the industrial flue gas desulfurization requirement is met.

The invention discloses a method for preparing fly ash-based layered double hydroxides through molybdenum sulfide intercalation modification. The method comprises the following steps: mixing washed fly ash with AlCl3 and hydrochloric acid, and adding NaOH to adjust the pH value so as to prepare the fly ash-based layered double hydroxides; on the basis, MoS < 2-> is coupled by a mechanochemical method to prepare a single-phase material molybdenum sulfide intercalation modified fly ash-based layered double-metal hydroxide. According to the method, the adsorption capacity of the LDHs prepared from the fly ash on heavy metals Pb < 2 + >, Ag < + >, Hg < 2 + > and Cu < 2 + > can be remarkably improved, meanwhile, heavy metal adsorption selectivity can be brought to LDHs materials, the selectivity is that Ag < + > is larger than Hg < 2 + >, Cu < 2 + > is larger than Pb < 2 + >, and the selectivity is larger than others, in addition, by adopting a mechanochemical method, precipitation of Mo can be remarkably reduced, the harmfulness of the materials is reduced, and meanwhile the cost, the energy consumption and the environmental harm are reduced.

The invention relates to the technical field of petrochemical wastewater purification treatment, in particular to a high-selectivity composite adsorption material for petrochemical wastewater treatment and a preparation method thereof, and the preparation method comprises the following steps: dispersing sodium bentonite in deionized water, adding an intercalator, and reacting to obtain pretreated bentonite; dispersing the pretreated bentonite in an ethanol aqueous solution, adding trithiol-s-triazine trisodium salt, and reacting to obtain sulfydryl modified bentonite; the sulfydryl modified bentonite is dispersed in ethyl alcohol, an amino silane coupling agent is dropwise added, and aminated bentonite is obtained through a reaction; the preparation method comprises the following steps: dispersing aminated bentonite into anhydrous tetrahydrofuran, and adding gamma-butyl selenolactone for reaction to obtain the composite adsorption material. According to the prepared composite material, through the synergistic effect of multiple adsorption mechanisms, the adsorption selectivity and bonding strength of metal ions in petrochemical wastewater are remarkably improved, and a technical support is provided for precise purification treatment of the petrochemical wastewater.

The invention discloses a high-performance photocatalytic synergistic adsorption material containing a ZIF-67 nano-structure and a preparation method and application thereof.According to the adsorption material, aminated natural polysaccharide serves as a raw material, a reduced graphene oxide composite zinc hydroxystannate structure is loaded on adsorption gel through an in-situ growth technology and a hydrothermal synthesis method, and the high-performance photocatalytic synergistic adsorption material containing the ZIF-67 nano-structure is obtained. The mechanical strength and the water stability of the composite material are improved; meanwhile, a metal organic framework ZIF-67 porous material is adopted, so that the adsorption selectivity and affinity of the material to specific metal ions are further improved; in addition, by introducing montmorillonite and potassium humate, the conjugation and chelation coordination between active binding sites of the three-dimensional network structure and pollutants are further enhanced, the efficiency of the adsorption material is improved, and a foundation is laid for wide application of the adsorption material in the field of photocatalytic synergistic adsorption.

The invention discloses a hydrophobic modification method of an Al-based metal organic framework material. According to the hydrophobic modification method of the Al-based metal organic framework material provided by the invention, the Al-based metal organic framework material and polydimethylsiloxane (PDMS) are placed in a high-temperature and closed environment to react for 20-120 minutes, so that the polydimethylsiloxane can coat the surface of the Al-based metal organic framework material with small molecular silane in a vapor deposition manner. On one hand, the method is short in time consumption, simple to operate and easy to control, hydrophobic modification of the Al-based metal organic framework material can be achieved within a short time, and good repeatability is achieved; on the other hand, the hydrophobicity of the Al-based metal organic framework material can be remarkably improved on the basis that the original pore structure of the Al-based metal organic framework material is reserved to the maximum extent, and then the adsorption selectivity of the Al-based metal organic framework material to VOC is greatly improved.

The invention provides a molecular sieve catalyst for purifying and recycling CO in soot. The molecular sieve catalyst is mainly prepared from the following raw materials in parts by weight: 65-70 parts of zeolite powder; 30 to 35 parts of pseudo-boehmite; 7.5 to 8.5 parts of a copper-based composition; and 9.2 to 12.5 parts of a calcium-based composition. The Cax type zeolite powder, the Nax type zeolite powder and the pseudo-boehmite are used as catalyst carrier raw materials, and the adsorption capacity and the adsorption selectivity of carbon monoxide are greatly improved through cooperation of the Cax type zeolite powder, the Nax type zeolite powder and the pseudo-boehmite, so that the final molecular sieve can achieve the effects of high temperature resistance, corrosion resistance, acid resistance and pressure resistance; the molecular sieve catalyst has good adsorptive selectivity on low-concentration carbon monoxide, and is suitable for purification and recovery of carbon monoxide in industrial soot.

The invention discloses activated carbon for capturing carbon dioxide and a preparation method and application thereof.The preparation method of the activated carbon comprises the steps that waste sludge is dried to constant weight, smashed and sieved to obtain sludge powder, under the protection of inert atmosphere, the sludge powder, oil paint and an initiator azodiisobutyronitrile are heated and stirred in ethyl alcohol, a free radical polymerization reaction is conducted, and the activated carbon is obtained; the preparation method comprises the following steps: precipitating a solid in the process, filtering, drying, preparing oily paint sludge, carbonizing at high temperature in a tubular furnace in which N2 atmosphere is introduced, immersing the obtained carbon material in a KOH aqueous solution, heating, stirring and reacting, after the reaction is finished, carrying out suction filtration and drying, and calcining and activating the dried sample in the tubular furnace in which N2 atmosphere is introduced, thereby obtaining the oily paint sludge. And immersing the activated sample in a sulfuric acid solution, heating and stirring for reaction, and after the reaction is finished, performing suction filtration and drying to obtain the activated carbon product. The activated carbon prepared by the invention has the advantages of low cost, good adsorption selectivity and large CO2 adsorption capacity.

This invention discloses a passive adsorption-selective catalytic reduction (CCR) device for diesel vehicles, comprising an electronically controlled nozzle, a first mixing chamber, a pre-catalytic oxidation-reduction chamber, a second mixing chamber, and a post-catalytic oxidation-reduction chamber arranged sequentially. The first mixing chamber includes a first urea solution inlet, a V-shaped breaker wall, and a W-shaped bottom mixing chamber. The V-shaped breaker wall is fixed to the rear wall of the first urea solution inlet pipe. The W-shaped bottom mixing chamber includes an inner cavity and an outer cavity. The inner cavity wall has staggered array openings, and the inner and outer cavities are connected through these openings. A guide wall structure is connected to the outermost pipe at the end of the first mixing chamber. The CCR chamber is connected to the end of the guide wall, and a three-zone integrated catalyst is located inside the CCR chamber. This invention solves the problems of severe NOx escape during the cold start phase, system complexity, and low-temperature urea crystallization in existing selective catalytic reduction technologies.