20 results about "Mordenite" patented technology

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.

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.

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 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 application discloses a C5-C6 hydrocarbon hydroconversion method. The method comprises the following steps: C5-C6 hydrocarbons are subjected to normal and iso separation, C5-C6 normal alkanes obtained are directly used as ethylene raw materials, C5-C6 iso alkanes obtained are mixed with hydrogen and subjected to hydroconversion reaction through a hydroconversion reaction zone, reaction effluent enters a separation system, hydrogen-rich gas and hydroconversion products are separated, the hydroconversion products are separated to obtain C2-C4 hydrocarbons which are directly used as ethylene raw materials, and C5-C6 hydrocarbons continue to be recycled and converted; wherein, the hydroconversion reaction zone is sequentially filled with a hydroconversion catalyst containing ZSM-5 molecular sieve and a hydroconversion catalyst containing mordenite along the flow direction. The method can maximize the quality of ethylene raw materials, improve the ethylene yield of an ethylene device and the total yield of trienes.

The present application relates to the field of molecular sieve preparation, and discloses a surface silicon-rich mordenite, a preparation method and application thereof, wherein the surface Si / Al molar ratio of the mordenite is 10-80, the bulk Si / Al molar ratio is 3-25, and the ratio of the surface Si / Al molar ratio to the bulk Si / Al molar ratio is above 1.2. In the preparation method of the mordenite, a first gel is crystallized to generate mordenite with a low Si / Al ratio, and after the first crystallization is completed, a second gel with a high Si / Al ratio is added and subjected to a second crystallization process, so that the nucleation and growth of the second gel are inhibited, the second gel is quickly dissolved, and an epitaxial growth of the second gel on the outer surface of the first crystallization product is promoted, thereby generating a surface layer structure rich in silicon. The molecular sieve provided by the present application can inhibit the adsorption of macromolecular components or carbon deposition precursors on the surface layer, and promote the diffusion and conversion of small molecule raw materials.

The application discloses a hydroconversion method of hydrocracking light naphtha. The method comprises the following steps: (1) mixing the hydrocracking light naphtha with hydrogen and performing hydroconversion reaction through a hydroconversion reaction zone; the hydroconversion reaction zone is sequentially filled with a hydroconversion catalyst containing ZSM-5 molecular sieve and a hydroconversion catalyst containing mordenite along a flow direction; (2) the reaction effluent of step (1) enters a separation system to obtain hydrogen-rich gas and a hydroconversion product. The method can realize efficient conversion of different molecular hydrocarbons, thereby improving the proportion of n-alkanes in the hydrogenation product.

The application provides a mordenite molecular sieve and a preparation method and application thereof. The mordenite molecular sieve provided by the application has an acid amount in 8-MR channels of not less than 245 mu mol / g. The preparation method of the mordenite molecular sieve comprises the following steps: aging and crystallizing a sol containing an aluminum source, a first silicon source, a second silicon source, a template agent and a surfactant to obtain mordenite molecular sieve raw powder, wherein the first silicon source comprises water glass, and the second silicon source comprises white carbon black; and drying and calcining the mordenite molecular sieve raw powder to obtain the mordenite molecular sieve. Compared with the existing mordenite molecular sieve, the mordenite molecular sieve provided by the application has a higher B acid amount, and has higher catalytic activity and dimethyl ether conversion rate in a dimethyl ether carbonylation reaction.

The present application relates to a kind of purification methods of m-bromotoluene, belong to the technical field of separation and purification.A kind of purification method of m-bromotoluene, it is characterized in that, after the crude product of m-bromotoluene containing p-bromotoluene is gasified, it is passed into zeolite, and the fraction is collected to obtain m-bromotoluene fine product.The separation and purification method of m-bromotoluene provided by the present application, by the mordenite provided by the present application, the efficient separation of p-bromotoluene and m-bromotoluene is realized, and m-bromotoluene yield is high.The pore size of the mordenite provided by the present application is just larger than the diameter of p-bromotoluene molecule, and smaller than the diameter of m-bromotoluene molecule.By the method of the present application, isomer impurities in m-bromotoluene can be removed, and high-purity m-bromotoluene can be obtained.

This invention relates to the field of mordenite synthesis, and discloses surface-rich aluminum mordenite, its preparation method, and applications. The mordenite has a surface Si / Al molar ratio of 2-20 and a bulk Si / Al molar ratio of 5-30, with the ratio of the surface Si / Al molar ratio to the bulk Si / Al molar ratio being below 0.9. The preparation method includes: performing a first crystallization on a first solution with a molar composition of 1SiO2:0.02-0.07Al2O3:0.1-0.5Na2O:0.02-0.3S2:5-50H2O to obtain a first crystallized product; and performing a second crystallization on a second solution (molar composition of 1SiO2:0.03-0.15Al2O3:0.1-0.8Na2O:0.01-0.3S2:5-50H2O) with the first crystallized product. The surface-rich aluminum mordenite provided by this invention is particularly suitable for conversion reaction processes containing macromolecular hydrocarbons.