67 results about "Mordenite" patented technology

The invention belongs to the field of methanol conversion and utilization, and particularly relates to a three-layer multi-core structure catalyst for high-selectivity synthesis of monomethylamine and a preparation method of the three-layer multi-core structure catalyst. The core layer of the catalyst is gamma-aluminum oxide, the middle layer of the catalyst is a mordenite (MOR) molecular sieve, and the outer layer of the catalyst is porous SiO2. The preparation of the multi-core MOR layer adopts a steam-assisted crystallization method, the preparation method is simple, no organic waste liquid is generated, the preparation method is environment-friendly, the multi-core MOR layer can be used in a reaction for preparing methylamine through continuous gas phase catalytic amination of methanol after being modified by ammonium ion exchange and chemical liquid phase deposition (CLD), the methanol conversion rate reaches 98.6% under the reaction conditions that the temperature is 340 DEG C, the methanol liquid hourly space velocity is 1.5 h <-1 >, the ammonia-alcohol ratio is 3 and the pressure is normal, and the method is suitable for industrial production. The mass ratio of monomethylamine is greater than 60%, and the method has a good application prospect.

Hybrid catalysts for simultaneous dehalogenation and cracking of plastic derived oil include composite particles, where each of the composite particles includes red mud particles and Mordenite zeolite particles. A process includes contacting a plastic derived oil stream with the hybrid catalyst in an FCC reactor to produce an FCC effluent and a used hybrid catalyst. The plastic derived oil stream comprises halogen-containing compounds, and contacting the plastic derived oil stream with the hybrid catalyst causes halogen-containing compounds to react to form hydrocarbons and hydrogen halides, where the hydrogen halides are adsorbed onto surfaces of the red mud particles. The FCC effluent has a concentration of the halogen-containing compounds less than the plastic derived oil stream. Contacting the plastic derived oil stream with the hybrid catalyst causes hydrocarbons in the plastic derived oil stream to undergo cracking reactions over the Mordenite zeolite particles to produce the FCC effluent.

The invention discloses a graded porous mordenite catalyst as well as a preparation method and application thereof, and belongs to the technical field of heterogeneous catalysis and chemistry and chemical engineering. The preparation method comprises the following steps: carrying out hydrolysis-polycondensation reaction on a silicon source, an aluminum source, an alkali source and water, after the reaction is completed, adding an alpha, omega-biquaternary ammonium salt surfactant as a template agent, and carrying out template-oriented self-assembly reaction to obtain gel; carrying out hydrothermal crystallization treatment on the gel to obtain zeolite raw powder; roasting the zeolite raw powder for the first time to remove the template agent so as to obtain roasted zeolite; and carrying out ion exchange treatment on the roasted zeolite, and roasting again to obtain the graded porous mordenite catalyst. According to the invention, the alpha, omega-biquaternary ammonium salt surfactant is used as the template agent to prepare the hierarchical porous structure catalyst with both inherent micropores and uniform mesopores, so that mass transfer can be improved and acidic sites can be optimized.

The invention discloses a copper-based catalyst for preparing acetaldehyde through ethanol dehydrogenation as well as a preparation method and application of the copper-based catalyst. The preparation method comprises the following steps: S1, carrying out alkalization treatment on protic mordenite in a strong alkali solution to increase the number of surface hydroxyl groups of the protic mordenite; and S2, adding the mordenite obtained in the step S1 into a copper salt solution to load copper ions, and then sequentially carrying out low-temperature drying shaping and medium-temperature activation stages to obtain the copper-based catalyst with networked Cu-OH-Si-O bonds on the surface. Through the synergistic effect of alkali liquor regulation and control and staged oxygen roasting, the dispersity and stability of a Cu active center in the catalyst are improved, the acetaldehyde selectivity of the reaction of preparing acetaldehyde through ethanol dehydrogenation is also improved, and side reactions are inhibited. Carrying out heat treatment regeneration on the inactivated copper-based catalyst in an oxygen-containing atmosphere; and after regeneration, the networked Cu-OH-Si-O bond on the surface of the copper-based catalyst is reconstructed.

The invention discloses a preparation method and application of an eight-membered ring aluminum-rich mordenite nanosheet. The preparation method comprises the following steps: respectively weighing a silicon source, inorganic alkali, an aluminum source, a template agent Te, water and a metal additive Me according to a molar ratio of 1: (0.1-0.3): (0.02-0.08): (0.1-0.3): (10-40): (0.01-0.1); mixing and stirring the raw materials in an ice-water bath to prepare initial gel; putting the initial gel into a hydrothermal reaction kettle, carrying out hydrothermal crystallization in a drying box, and then centrifuging, filtering and drying to obtain a sodium mordenite molecular sieve; roasting the sodium mordenite molecular sieve to remove the organic template agent; carrying out ammonium ion exchange on the roasted mordenite molecular sieve in a water bath kettle to obtain an ammonium type mordenite molecular sieve; carrying out roasting treatment on the ammonium type mordenite molecular sieve to obtain a hydrogen type octatomic ring aluminum-rich mordenite nanosheet; the eight-membered ring aluminum-rich mordenite nanosheet prepared by the preparation method disclosed by the invention can exert excellent performance in a reaction for preparing acetic acid or methyl acetate through carbonylation of methanol or dimethyl ether.

The application provides a C8 aromatic hydrocarbon isomerization catalyst and a preparation method and application thereof. The catalyst contains an active component and a carrier; wherein, based on the weight of the carrier, the carrier contains 5wt%-25wt% of HZSM-23, 5-30wt% of mordenite, 20-60wt% of macroporous alumina and 10wt%-25wt% of a binder component. The method comprises preparation of the carrier and loading of the active metal, wherein the preparation process of the carrier is as follows: HZSM-23 molecular sieve, mordenite, macroporous alumina and a binder are mixed and formed, and the carrier is prepared after drying and calcination. The catalyst is used for C8 aromatic hydrocarbon isomerization reaction, and has the characteristics of high ethylbenzene conversion rate and high xylene yield when the xylene is at an equilibrium concentration.

The application discloses a processing method of aromatic raffinate oil. The method comprises the following steps: (1) contacting and reacting aromatic raffinate oil, hydrogen and a hydroconversion catalyst in a hydroconversion reaction zone, wherein the hydroconversion catalyst is a molecular sieve catalyst, and the molecular sieve is selected from any one of mordenite or ZSM-5 molecular sieve; (2) separating the hydroconversion reaction effluent obtained in the step (1) to obtain a hydrogen-rich gas and a liquid phase stream; and (3) separating the liquid phase stream obtained in the step (2) to obtain a liquid phase product and a gas phase product. The method can effectively convert isomeric alkanes in the aromatic raffinate oil into n-alkanes, and improve the ethylene raw material quality.

The application discloses a method for producing ethylene raw material. The method comprises the following steps: mixing hydrocracking light naphtha and hydrogen into a first hydroconversion reaction zone to react, and then the reaction effluent enters a separation system to obtain hydrogen-rich gas and a first hydroconversion product; the first hydroconversion product is separated to obtain ethane, propane, isobutane, isopentane and n-pentane; the isobutane is mixed with hydrogen into a second hydroconversion reaction zone, and the reaction effluent is separated to obtain n-butane; the second hydroconversion reaction zone is filled with a hydroconversion catalyst containing ZSM-35 molecular sieve; and the isopentane is recycled to the inlet of the first hydroconversion reaction zone. The first hydroconversion reaction zone is filled with a hydroconversion catalyst containing mordenite, and at least two catalyst beds are filled; and the active metal content of the hydroconversion catalyst decreases in turn along the flow direction. The method can effectively improve the proportion of normal alkanes in the product and improve the quality of the ethylene raw material.

The invention discloses a catalyst for preparing methyl acetate through carbonylation of dimethyl ether as well as a preparation method and application of the catalyst, and belongs to the technical field of industrial catalysis. A preparation method of a catalyst for preparation of methyl acetate through carbonylation of dimethyl ether comprises the following steps: placing a template agent-containing sodium mordenite molecular sieve in low-temperature plasma, and carrying out modification treatment under a first preset condition to obtain a modified sodium mordenite molecular sieve; performing ammonium ion exchange treatment on the modified sodium-type mordenite molecular sieve to obtain an ammonium-type mordenite molecular sieve; and placing the ammonium type mordenite molecular sieve in low-temperature plasma, and carrying out modification treatment under a second preset condition to obtain the catalyst, wherein the first preset condition comprises that modification treatment is carried out under gradient voltage; the second preset condition comprises modification treatment under a constant voltage. According to the preparation method disclosed by the invention, the acid density, the micropore specific surface area and the micropore volume of the mordenite can be improved, and the mordenite shows higher catalytic activity and stability in a reaction for preparing methyl acetate through dimethyl ether carbonylation.

The invention discloses a water-based functional building exterior wall coating as well as a preparation process and application thereof, and belongs to the technical field of coatings. The coating is composed of a hydroxy acrylic emulsion, a fluorocarbon emulsion, an iron-doped molybdenum disulfide / nano cellulose compound, composite aerogel powder, modified mordenite, nano SiO2 particles, an intumescent flame retardant, an auxiliary agent and water. Wherein the composite aerogel powder is of a porous structure formed by coating hollow Fe2O3 / TiO2 with SiO2; the intumescent flame retardant is prepared from ammonium polyphosphate, pentaerythritol and melamine according to a specific proportion. The preparation process of the coating comprises a plurality of steps, such as dispersing, stirring, pH adjusting and the like. The coating has excellent properties, such as low heat conductivity coefficient, high antibacterial rate, long flame retardant time and good artificial aging resistance, and can be applied to building exterior walls. Compared with the prior art, the problems of function stacking performance offset, poor nano material compatibility and the like are solved, and the application prospect is wide.

This application discloses a method for preparing and applying a tin selenide-supported ferruginous zeolite catalyst, belonging to the field of catalytic chemistry. The preparation method includes: pre-crystallizing a mixed solution containing a silicon source, an aluminum source, a template agent, and water to obtain a silica-alumina gel; under stirring conditions, slowly adding a mixed solution containing a tin source, a selenium source, and ethanol sequentially, and then slowly adding an alkali to the silica-alumina gel to obtain a mixed gel; placing the mixed gel in a sealed container for hydrothermal crystallization; washing and drying the hydrothermally crystallized product, followed by calcination, to obtain the tin selenide-supported ferruginous zeolite catalyst. This application, by modifying silica-alumina molecular sieves with tin selenide, enables one-step ethanol production using hydrogen and carbon dioxide as raw materials in a fixed-bed reactor. Furthermore, the selectivity of ethanol can be adjusted by modifying the catalyst preparation process.

The application discloses a preparation method of a modified mordenite catalyst, the catalyst prepared by the method, and application of the catalyst. The preparation method comprises the following steps: 1) adding mordenite into acid, soaking, and roasting to obtain acid-modified mordenite; 2) fully contacting the acid-modified mordenite with TiCl4 vapor to obtain Ti-modified titanium mordenite; 3) mixing the Ti-modified titanium mordenite with tungsten metal salt, zirconium metal salt and molybdenum metal salt in a solution, adding ammonia water to age, filtering out solid, and washing, drying and roasting the solid to obtain a supported catalyst; and 4) immersing the obtained supported catalyst in acid, filtering and roasting to obtain the modified mordenite catalyst. The modified mordenite catalyst has high catalytic activity for catalytic nitration of aromatic hydrocarbons, high product yield, reusability and long service life.

The application belongs to the technical field of fine chemical industry, and particularly relates to a hydrogen bromide purification method for removing bromine, water and impurities before liquefaction, which comprises the following steps: S1, removal of free bromine: hydrogen bromide gas is introduced into a first bromine removal tank filled with a red phosphorus filler layer; S2, preliminary removal of water: the gas treated in S1 is introduced into a first drying tank filled with liquid phosphorus tribromide; S3, deep removal of trace water: the gas treated in S2 is introduced into a second drying tank filled with resin or mordenite; and S4, separation of mechanical impurities: the gas treated in S3 is introduced into a cyclone separator. By adopting the red phosphorus filler layer and controlling the loading amount, particle size and loading density of the red phosphorus, the free bromine in the hydrogen bromide gas can be efficiently removed, liquid phosphorus tribromide is used as a drying medium and is supplemented in real time to maintain the mass concentration of the phosphorus tribromide, so that the bromine and water content in the gas can be effectively reduced, and high-quality gas is provided for subsequent deep drying and impurity separation.

The invention discloses P-type zeolite converted from mordenite and a preparation method thereof, and the method comprises the following steps: step 1, mixing 5g of mordenite with 0.05-0.5 g of calcium-containing substance, adding into 50mL of NaOH solution with the concentration of 1-2M, and stirring to uniformly mix to obtain a precursor mixture; and 2, carrying out hydrothermal modification on the precursor mixture at 95-105 DEG C for 6-12 hours, and sequentially carrying out suction filtration, drying and grinding to obtain the P-type zeolite. According to the invention, the preparation cost of the P-type zeolite is reduced, and the synthesized P-type zeolite has excellent selective adsorption performance on Sr, Co and Mn ions in water.

This invention provides a metal-modified mordenite molecular sieve catalyst, its preparation method, regeneration method, and applications, relating to the field of molecular sieve catalysts. The preparation method of the metal-modified mordenite molecular sieve catalyst includes the following steps: Step 1: Obtaining a mixture comprising a Ni-containing precursor, a Ce-containing precursor, and water; Step 2: Mixing the mixture obtained in Step 1 with mordenite molecular sieve and performing an impregnation treatment; Step 3: Calcination; Step 4: Conducting a reduction reaction in a reducing atmosphere at a temperature of 500-700℃ to obtain the metal-modified mordenite molecular sieve catalyst. The catalyst preparation method provided by this invention combines impregnation, calcination, and high-temperature reduction, utilizing Ce oxide and Ni to modify the mordenite molecular sieve, significantly improving the alkylation activity of the obtained catalyst.

The invention discloses an ozone oxidation catalyst for casting waste gas treatment and a preparation method thereof, and belongs to the technical field of waste gas treatment. The mordenite is used as a catalyst carrier, the fluorinated silane is loaded on the surface of the mordenite through a reflux liquid phase deposition method to construct a hydrophobic barrier, the modified mordenite is obtained, the ozone decomposition performance of the modified mordenite in a high-humidity environment is remarkably improved, and further in an intermittent micro-negative pressure environment, the ozone decomposition performance of the modified mordenite is improved. A transition metal oxide is loaded on the surface of the modified mordenite to obtain the ozone oxidation catalyst, and through optimization of a preparation process, namely roasting activation and intermittent micro-negative pressure treatment are combined with a proper proportion of metal oxide sol, the number and accessibility of active sites of the catalyst are enhanced, and the ozone catalysis performance of the catalyst is promoted to be further improved. The ozone oxidation catalyst is applied to the treatment of casting waste gas, especially toluene-containing waste gas, and can show efficient, stable and high-adaptability treatment effects under different working conditions.

The application provides a layered mordenite molecular sieve and a preparation method thereof. The content of four-coordinated framework aluminum in the layered mordenite molecular sieve provided by the application is greater than or equal to 80% of the total aluminum content. The process procedure of the application is simple, the preparation efficiency is high, the cost is low, the layered mordenite molecular sieve synthesized by the application has high crystallinity, a high proportion of four-coordinated framework aluminum, and a large micropore specific surface, and is more suitable for popularization and application in industry.

The application belongs to the technical field of molecular sieve catalysis, and relates to a preparation method and application of a catalyst for catalyzing methane steam into methanol by plasma. The catalyst uses mordenite prepared by a hydrothermal synthesis method as a carrier, is exchanged by copper ions, and is subjected to acid treatment by using a nitric acid solution, so that the acid site distribution and strength of the mordenite are accurately controlled, and deep oxidation of methanol is effectively inhibited. The preparation method comprises three core steps of hydrothermal synthesis of mordenite, copper ion exchange and acid treatment for controlling acidity, and has the advantages of simple process and low cost. The catalyst is applied to a reaction of catalyzing methane steam into methanol by plasma at low temperature, and under the mild conditions of low temperature and normal pressure, the selectivity of methanol can reach 57.58%, and the methanol accounts for more than 90% of liquid phase products. The application solves the problems of low methanol selectivity and insufficient research on acid control of existing catalysts for catalyzing methane into methanol, and provides a green and efficient technical scheme for efficient conversion of methane into high-value-added methanol.

This invention provides a molecular sieve catalyst, its preparation method, and its application, relating to the field of molecular sieve catalysts. The preparation method of the molecular sieve catalyst provided by this invention includes the following steps: Step 1: Obtaining a mixture comprising a Mg-containing precursor, a Ce-containing precursor, a dispersant, and water; Step 2: Mixing the mixture obtained in Step 1 with a mordenite molecular sieve and subjecting it to a pressurized hydrothermal reaction to obtain the molecular sieve catalyst. The preparation method of the molecular sieve catalyst provided by this invention involves mixing a dispersant with a metal precursor and impregnating it with a molecular sieve to uniformly disperse magnesium and cerium on the inner and outer surfaces of the molecular sieve; then, using an impregnation method combined with a pressurized hydrothermal method, Mg and Ce are successfully introduced into the molecular sieve framework, further adjusting the acidity of the mordenite molecular sieve. This catalyst exhibits high activity and selectivity when applied to the production of diisopropylnaphthalene from monoisopropylnaphthalene and propylene.

The application discloses a modification method of mordenite molecular sieve and application thereof, and belongs to the technical field of industrial catalysis. The modification method of the mordenite molecular sieve comprises the following steps: placing sodium type mordenite molecular sieve containing a template agent in a low-temperature plasma, and modifying and treating the sodium type mordenite molecular sieve under preset conditions to obtain modified sodium type mordenite molecular sieve; performing ammonium ion exchange treatment on the modified sodium type mordenite molecular sieve to obtain ammonium type mordenite molecular sieve; and performing calcination treatment on the ammonium type mordenite molecular sieve to obtain hydrogen type mordenite molecular sieve; wherein the preset conditions comprise the following steps: using a gas containing oxygen as a plasma generation gas; performing the modification treatment under a gradient voltage; and the time for the modification treatment is 1-120 min. The modification method can improve the acid density of the mordenite, and the mordenite has higher catalytic activity and stability in a reaction of dimethyl ether carbonylation for preparing methyl acetate.

This application belongs to the field of molecular sieve synthesis technology, and discloses nanosheet mordenite zeolite molecular sieves, their preparation methods, and applications. The preparation method includes: mixing a silicon source, an aluminum source, an alkali source, a first template agent, a second template agent, and a solvent to obtain a first mixture; the silicon and aluminum sources are simultaneously provided by a non-MFI, non-MOR structured zeolite molecular sieve raw material; the first template agent is used to regulate the formation of the mordenite zeolite framework structure, and the second template agent is used to inhibit crystal growth in a specific crystal orientation; crystallization treatment is performed to obtain a second mixture; the solid product in the second mixture is separated, washed, and dried to obtain a raw powder; the raw powder is subjected to a first calcination to obtain a first powder; the first powder is subjected to ion exchange to remove inorganic alkali metal ions, followed by a second calcination to obtain nanosheet mordenite zeolite molecular sieves. The phase inversion method and the synergistic effect of template agents with different functions are used to regulate the morphology and structure of the molecular sieve; this method is simple and suitable for industrial production.

PROCESS FOR THE PRODUCTION OF NITRIC ACID COMPRISING A CATALYTIC TREATMENT OF N2O FROM TAIL GASES AND A NITRIC ACID PRODUCTION UNIT. The invention relates to a process for the production of nitric acid comprising at least one step for treating a gaseous effluent containing N2O, said process comprising at least the following steps in this order: - a step in which ethanol is added to the gaseous effluent; - a step for treating the gaseous effluent which is a decomposition step of N2O on a catalytic bed containing at least one catalyst comprising an iron-exchanged ferrierite zeolite, at a temperature below 400°C. The invention also relates to a nitric acid production unit. Figure for the abstract: Fig. 2

The invention discloses a BTX catalyst prepared from polycyclic aromatic hydrocarbon as well as a preparation method and application of the BTX catalyst. The catalyst comprises a carrier and an active component, wherein the carrier comprises a molecular sieve A and a molecular sieve B, the molecular sieve A is selected from at least one of mordenite, a Beta molecular sieve and a Y molecular sieve, and the molecular sieve B is a ZSM-5 molecular sieve; the active component comprises a rare earth metal M1 and a transition metal M2. The catalyst provided by the invention is used in a reaction for preparing BTX from polycyclic aromatic hydrocarbon, and has the advantages of good conversion activity of polycyclic aromatic hydrocarbon, high selectivity of a target product and the like.

The invention relates to a fully-crystallized mordenite molded catalyst as well as a preparation method and application thereof. The catalyst is completely composed of mordenite crystals and does not contain other crystalline or amorphous components; the preparation method comprises the following steps: adding a binder (a silicon source, an aluminum source and alkali) into mordenite, molding, and carrying out a steam-assisted crystallization method. Converting the binder into a molecular sieve through secondary crystallization; in the steam-assisted crystallization process, the molecular sieve is not in contact with the solution, so that the preparation of the fully-crystallized mordenite forming catalyst is realized. The method is simple, convenient, green, efficient and easy to amplify, and the fully-crystallized molecular sieve can be successfully prepared only in an extremely short crystallization time on the premise of not using an organic template agent.

The application discloses a high-efficiency wastewater mercury removal agent and a preparation method thereof, belongs to the field of wastewater mercury removal, and comprises 20-50 parts of inorganic particles, wherein the inorganic particles are at least one of bentonite, zeolite or molecular sieve, the surface of the inorganic particles is chemically modified by using 1-5 parts of a silane coupling agent, and then the surface is adsorbed by 1-10 parts of an organic thioamide reagent; the bentonite is calcium-based bentonite or sodium-based bentonite with a blue absorption capacity of 40-50 g / 100 g and an expansion ratio of 20-40, the zeolite is clinoptilolite or mordenite, and the molecular sieve is 3A or 4A molecular sieve; the silane coupling agent is at least one of gamma-aminopropyl triethoxysilane, gamma-glycidyl ether oxygen propyl trimethoxysilane, methacryloyl trimethoxysilane, 2-(3,4-epoxy cyclohexyl) ethyl trimethoxysilane and 3-mercapto propyl trimethoxysilane; and the organic thioamide reagent is one or both of thiosemicarbazide and dithizone.

The application provides a method for preparing adamantane, which comprises: isomerizing tetrahydrodicyclopentadiene in the presence of a mesoporous mordenite molecular sieve catalyst with acid sites established by an organic acid, in the presence of an optional organic solvent, and in a hydrogen-containing atmosphere; and calculating the NH3-TPD peak area of the catalyst by integration, wherein the peak area of the weak acid center of the catalyst is greater than or equal to 330, the peak area of the strong acid center of the catalyst is less than or equal to 282, and the specific surface area of the catalyst is greater than or equal to 300 m 2 / g. In the synthesis of adamantane by the method, the isomerization reaction of adamantane is carried out in the presence of the above catalyst, at a reaction temperature of 250 DEG C, a hydrogen pressure of 1 Mpa, and in a 100-ml stainless steel autoclave. The product composition is analyzed by gas chromatography, and the chromatographic column is an HP-5 capillary column with a column length of 30 m. The purity of adamantane can reach more than 99%.

The invention discloses a preparation method of a thin c-axis copper-based mordenite nanosheet and application of the thin c-axis copper-based mordenite nanosheet. The preparation method comprises the following steps: 1, dissolving a copper source into deionized water, dropwise adding a nitrogen-containing ligand into the copper source dissolved into the deionized water, and violently stirring to obtain a copper amine complex A; 2, uniformly mixing an aluminum source, an alkali source, a silicon source, a template agent and water to obtain gel B; and 3, mixing the copper ammonium complex A with the gel B, carrying out hydrothermal crystallization, filtering, drying, and roasting to obtain the thin c-axis copper-based mordenite nanosheet with regular morphology. The method has the advantages of being simple in technological process, low in cost and safe in process, and has industrialization prospects.

The invention belongs to the technical field of tunnel engineering grouting, and particularly relates to a low-carbon grouting material for blocking a small karst cavity of a karst stratum, a preparation method, application and a construction method. The low-carbon grouting material is prepared by mixing a component A, a component B and a component C according to the volume ratio of 1: 0.4: 0.05, the component A is a base material of cement mixed slurry and is prepared by mixing cement, fly ash and blast furnace slag according to the mass ratio of 1: 2: 0.75 and controlling the water-binder ratio to be 0.4: 1; the component B is a water glass solution, wherein the mass ratio of water is 25%; and the component C is a waterproof material which is prepared by compounding natural mordenite subjected to surface modification treatment by alkylamine with silica fume and then adding a polyacrylamide aid. A large amount of industrial by-products such as the fly ash and the blast furnace slag are used for replacing traditional cement, carbon emission is greatly reduced from the source, and green cyclic utilization of resources is achieved.

The invention discloses a method for preparing formic acid through water carbonylation, and belongs to the technical field of catalytic chemistry. The method comprises the following steps: heating and vaporizing water, mixing with carbon monoxide to form feed gas, and reacting under the action of a catalyst at certain temperature, pressure and space velocity to generate formic acid. The catalyst is selected from at least one of mordenite, ZSM-5, ZSM-23, a Na-type Y molecular sieve and an H-type Y molecular sieve, and can be subjected to gas activation before use. According to the method, cheap and easily available raw materials are adopted, the reaction condition is mild, the technological process is simple, and a new way with potential application value is provided for green synthesis of formic acid.

The application discloses a preparation method of mother liquor recycling synthesis of high-silicon mordenite molecular sieve and application of the high-silicon mordenite molecular sieve as a dimethyl ether carbonylation reaction catalyst for preparing methyl acetate, and belongs to the technical field of industrial catalysis. The method comprises the following steps: S1, after the synthesis of the molecular sieve, the mother liquor is obtained through flocculation and filtration to obtain mother liquor I; S2, a mixture containing the mother liquor I, a silicon source, an aluminum source, an alkali source and a template T1 is placed in a closed container, and a mother liquor sol with a primary structural unit is obtained through crystallization; S3, a mixture I containing a silicon source, an aluminum source, an alkali source, a template T2 and water is aged to obtain a silicon-aluminum sol; S4, a mixture II containing the mother liquor sol and the silicon-aluminum sol is placed in a closed container, and high-silicon mordenite molecular sieve is obtained through crystallization I. The method makes the raw material components in the discharged mother liquor be recycled, improves the raw material utilization rate, reduces the synthesis cost, reduces the environmental protection pressure of enterprises, shortens the crystallization time of the molecular sieve synthesis, and improves the crystallinity of the product.