Abstract

2222 shell of the precursor to hydrophobic modification, so as to obtain the catalyst. Further provided in the present invention is the use of the preparation method. The preparation method is applied to the preparation of a CO-SCR catalyst. The catalyst provided in the present invention has a controllable silicon dioxide shell thickness, good water resistance and high catalytic activity. The preparation method therefor involves a simple process, has controllable conditions, is low cost, is convenient for industrial promotion and utilization, and can be used for preparing a variety of catalysts.

IPC Classes  ?

• B01J 23/889 - Manganese, technetium or rhenium
• B01D 53/86 - Catalytic processes
• B01D 53/62 - Carbon oxides
• B01J 35/00 - Catalysts, in general, characterised by their form or physical properties
• B01J 23/83 - Catalysts comprising metals or metal oxides or hydroxides, not provided for in group of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups with rare earths or actinides
• B01J 23/656 - Manganese, technetium or rhenium
• B01J 23/89 - Catalysts comprising metals or metal oxides or hydroxides, not provided for in group of the iron group metals or copper combined with noble metals

Abstract

The present disclosure relates to a multi-sandwich composite catalyst and a preparation method and application thereof. The present disclosure provides a preparation method of a multi-sandwich composite catalyst, comprises the following steps: sequentially depositing a first layer oxide, a first active metal, an oxide interlayer, a second active metal and a surface oxide on a template, and sequentially performing calcination and reduction, thereby obtaining a multi-sandwich composite catalyst; wherein the first active metal and the second active metal are different kinds of active metals. In the present disclosure, a multi-sandwich structure is formed by depositing the oxides and active metals alternately, so that the position and spacing distance of the active centers can be precisely controlled. The multi-sandwich composite catalyst prepared by the method provided described herein has a higher conversion than that of a catalyst without an interlayer when used for the catalytic reaction.

IPC Classes  ?

• B01J 35/06 - Fabrics or filaments
• B01J 23/89 - Catalysts comprising metals or metal oxides or hydroxides, not provided for in group of the iron group metals or copper combined with noble metals
• B01J 37/00 - Processes, in general, for preparing catalystsProcesses, in general, for activation of catalysts
• B01J 37/02 - Impregnation, coating or precipitation
• B01J 37/08 - Heat treatment
• B01J 37/18 - Reducing with gases containing free hydrogen
• B01J 37/34 - Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves
• C01B 3/04 - Production of hydrogen or of gaseous mixtures containing hydrogen by decomposition of inorganic compounds, e.g. ammonia
• C07C 209/36 - Preparation of compounds containing amino groups bound to a carbon skeleton by reduction of nitrogen-to-oxygen or nitrogen-to-nitrogen bonds by reduction of nitro groups by reduction of nitro groups bound to carbon atoms of six-membered aromatic rings

Abstract

Provided are an anion exchange membrane having an amide structure, a preparation method therefor and the use thereof. The preparation method comprises: polymerizing an aromatic hydrocarbon and a ketone having an amide structure by means of superacid catalysis, after forming the membrane by a casting method, treating the prepared membrane under alkaline conditions to obtain the anion exchange membrane having an amide structure. The obtained anion exchange membrane comprises a high-molecular polymer having an amide structure on the framework and having an excellent alkali stability. The polymer, after being subjected to an alkali treatment, not only has a high hydroxide conductivity, good mechanical properties and thermal stability, but also has an excellent alkali stability and excellent electrolytic water performance.

IPC Classes  ?

• C08J 5/22 - Films, membranes or diaphragms
• C08G 61/12 - Macromolecular compounds containing atoms other than carbon in the main chain of the macromolecule
• C25B 1/04 - Hydrogen or oxygen by electrolysis of water
• C25B 13/08 - DiaphragmsSpacing elements characterised by the material based on organic materials
• C25B 13/02 - DiaphragmsSpacing elements characterised by shape or form

Abstract

A method for catalyzing degradation of an anhydride-cured epoxy resin, comprising: formulating an anhydride-cured epoxy resin, a reaction solvent, and an organic acid catalyst into a degradation system, and performing a degradation reaction; after completing degradation, adding hot water to the system, fully dissolving, and filtering; and evaporating and recycling the filtrate to obtain a reaction solvent, a curing agent, and an organic acid catalyst, a filter cake being an organic phase epoxy resin degradation product.

IPC Classes  ?

• C08J 11/28 - Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with organic material by treatment with organic compounds containing nitrogen, sulfur or phosphorus
• C08J 11/26 - Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with organic material by treatment with organic oxygen-containing compounds containing carboxylic acid groups, their anhydrides or esters
• C08L 63/00 - Compositions of epoxy resinsCompositions of derivatives of epoxy resins

Abstract

The present invention provides a catalyst for aromatization of a long-carbon chain alkane and a preparation method thereof. In the present invention, a molecular sieve containing a BEA structure is taken as an active component and mixed with a carrier, and then the mixture is formed, dried and calcined to obtain the catalyst for aromatization of a long-carbon chain alkane. The active component is prepared by taking a Naβ molecular sieve as a raw material and modifying through the following steps of: first obtaining an Hβ molecular sieve through ammonium ion-exchange, and then conducting dealumination and silicon insertion treatment of the Hβ molecular sieve through first hydrothermal treatment; forming a mesoporous structure in a molecular sieve framework through second hydrothermal treatment; reducing the acidity of the catalyst by potassium ion exchange, and finally using metal modification to improve the capability of the catalyst for catalyzing the aromatization of the long-carbon chain alkane and enhancing the toluene selectivity. The catalyst provided by the present invention shows high stability in the aromatization of the long-chain alkane and has a service life up to 170 h or above and aromatic hydrocarbon selectivity up to 80%, and the selectivity to toluene in aromatic hydrocarbon products can reach 85.5%.

IPC Classes  ?

• C07C 5/367 - Formation of an aromatic six-membered ring from an existing six-membered ring, e.g. dehydrogenation of ethylcyclohexane to ethylbenzene
• B01J 29/44 - Noble metals
• B01J 37/30 - Ion-exchange
• B01J 37/02 - Impregnation, coating or precipitation
• B01J 37/10 - Heat treatment in the presence of water, e.g. steam
• C07C 6/10 - Preparation of hydrocarbons from hydrocarbons containing a different number of carbon atoms by redistribution reactions by conversion at a saturated carbon-to-carbon bond in hydrocarbons containing no six-membered aromatic rings
• C07C 5/32 - Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms by dehydrogenation with formation of free hydrogen
• C07C 4/00 - Preparation of hydrocarbons from hydrocarbons containing a larger number of carbon atoms
• C07C 6/08 - Preparation of hydrocarbons from hydrocarbons containing a different number of carbon atoms by redistribution reactions by conversion at a saturated carbon-to-carbon bond
• C07C 5/393 - Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms by dehydrogenation with formation of free hydrogen with simultaneous isomerisation with cyclisation to an aromatic six-membered ring, e.g. dehydrogenation of n-hexane to benzene
• C07C 5/41 - Catalytic processes
• C07C 13/271 - Monocyclic hydrocarbons or acyclic hydrocarbon derivatives thereof with a nine- to eleven-membered ring

Abstract

An aromatization catalyst and preparation process and use thereof is set forth. The catalyst comprises an inorganic oxide and a modified Ga-ZSM-5 zeolite, which comprises a modified ZSM-5 zeolite with a hierarchical macro-meso-microporosity and gallium deposited in channels of and/or on surfaces of the modified ZSM-5 zeolite. The hierarchical porosity of the modified ZSM-5 zeolite in the catalyst can reduce diffusion resistance of products during the aromatization reaction, thereby retarding carbon depositing rate and substantially improving catalytic activity, aromatic hydrocarbon selectivity, stability and lifetime of the catalyst. When being used in aromatization of propane, the catalyst exhibits a high stability, a lifetime of more than 320 hours, and a selectivity to aromatic hydrocarbons of up to 73.3 wt. %.

IPC Classes  ?

• C07C 2/84 - Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms by condensation of hydrocarbons with partial elimination of hydrogen oxidative coupling catalytic
• B01J 29/40 - Crystalline aluminosilicate zeolitesIsomorphous compounds thereof of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11
• B01J 23/18 - Arsenic, antimony or bismuth
• B01J 35/00 - Catalysts, in general, characterised by their form or physical properties
• B01J 37/04 - Mixing
• B01J 37/08 - Heat treatment
• C07C 2/06 - Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms by addition between unsaturated hydrocarbons by oligomerisation of well-defined unsaturated hydrocarbons without ring formation of alkenes, i.e. acyclic hydrocarbons having only one carbon-to-carbon double bond
• C07C 2/08 - Catalytic processes
• C07C 2/10 - Catalytic processes with metal oxides
• C07C 2/04 - Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms by addition between unsaturated hydrocarbons by oligomerisation of well-defined unsaturated hydrocarbons without ring formation
• C07C 2/12 - Catalytic processes with crystalline alumino-silicates, e.g. molecular sieves
• C07C 2/76 - Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms by condensation of hydrocarbons with partial elimination of hydrogen
• C07C 15/06 - Toluene
• C07C 15/08 - Xylenes
• B01J 35/10 - Solids characterised by their surface properties or porosity

Abstract

The present invention relates to the technical field of catalyst materials, in particular, to a multi-sandwich composite catalyst, a preparation method therefor and an application thereof. The present invention provides a preparation method for a multi-sandwich composite catalyst, comprising: sequentially depositing a first-layer oxide, a first active metal, an intermediate-layer oxide, a second active metal, and a surface-layer oxide on a template, and then sequentially performing roasting and reduction to obtain a multi-sandwich composite catalyst, wherein the first active metal and the second active metal are different types of active metals. According to the present invention, by alternately depositing oxides and active metals to form a multi-sandwich structure, the position of the active center and the spacing distance are accurately controlled. The results of embodiments show that the multi-sandwich composite catalyst prepared by the method provided by the present invention has a higher conversion rate than a catalyst having no intermediate transition layer when used in a catalytic reaction.

IPC Classes  ?

• B01J 23/89 - Catalysts comprising metals or metal oxides or hydroxides, not provided for in group of the iron group metals or copper combined with noble metals
• B01J 35/06 - Fabrics or filaments
• B01J 37/025 - Impregnation, coating or precipitation using a distinct intermediate layer, e.g. substrate-support-active layer
• B01J 37/34 - Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves
• C01B 3/04 - Production of hydrogen or of gaseous mixtures containing hydrogen by decomposition of inorganic compounds, e.g. ammonia
• C07C 209/36 - Preparation of compounds containing amino groups bound to a carbon skeleton by reduction of nitrogen-to-oxygen or nitrogen-to-nitrogen bonds by reduction of nitro groups by reduction of nitro groups bound to carbon atoms of six-membered aromatic rings

Abstract

A continuous slurry-bed tank reactor, comprising a tank reactor body, an agitator, and tubular separation membranes. A method of using the continuous slurry-bed tank reactor comprising adding a catalyst, feeding reactants, stopping feeding the reactants, starting a heating system, changing directions of the reactants flowing through the tubular separation membranes.

IPC Classes  ?

• B01J 8/10 - Chemical or physical processes in general, conducted in the presence of fluids and solid particlesApparatus for such processes with moving particles moved by stirrers or by rotary drums or rotary receptacles
• B01F 7/22 - Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a vertical axis with propellers
• B01D 65/02 - Membrane cleaning or sterilisation
• B01J 8/08 - Chemical or physical processes in general, conducted in the presence of fluids and solid particlesApparatus for such processes with moving particles
• B01J 8/00 - Chemical or physical processes in general, conducted in the presence of fluids and solid particlesApparatus for such processes
• C07C 249/08 - Preparation of compounds containing nitrogen atoms doubly-bound to a carbon skeleton of oximes by reaction of hydroxylamines with carbonyl compounds
• C07C 41/03 - Preparation of ethers from oxiranes by reaction of an oxirane ring with a hydroxy group
• B01F 27/91 - Mixers with rotary stirring devices in fixed receptaclesKneaders with stirrers rotating about a substantially vertical axis with propellers
• B01F 101/00 - Mixing characterised by the nature of the mixed materials or by the application field

Abstract

The disclosure relates to a process for continuously producing polyoxymethylene dimethyl ethers at low temperature, pertains to the technical field of polyoxymethylene dimethyl ether preparation processes, and solves the technical problem of continuous production of polyoxymethylene dimethyl ether. A membrane separation element with precisely controlled pores in membrane is used to realize a direct separation of the feedstocks from the catalyst within the reactor, and effectively reduce the permeation resistance of the separation membrane tube. By oppositely switching the flowing direction of liquid reaction materials, the adhesion of the catalyst to the separation membrane tube is inhibited, and some particles stuck in separation membrane tube are removed, which ensures the continuous operation of the reaction process and allows a molecular sieve catalyst to exhibit its advantage of long catalytic life.

IPC Classes  ?

• C07C 41/56 - Preparation of compounds having groups by reactions producing groups by condensation of aldehydes, paraformaldehyde, or ketones
• B01D 67/00 - Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
• B01D 69/04 - Tubular membranes
• B01J 4/00 - Feed devicesFeed or outlet control devices
• B01J 19/00 - Chemical, physical or physico-chemical processes in generalTheir relevant apparatus
• B01J 19/18 - Stationary reactors having moving elements inside
• B01J 29/40 - Crystalline aluminosilicate zeolitesIsomorphous compounds thereof of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11
• B01J 29/70 - Crystalline aluminosilicate zeolitesIsomorphous compounds thereof of types characterised by their specific structure not provided for in groups
• C07C 41/58 - SeparationPurificationStabilisationUse of additives
• B01D 71/02 - Inorganic material
• C07C 43/303 - Compounds having groups having acetal carbon atoms bound to acyclic carbon atoms

Abstract

The present invention provides a method for preparing gasoline and aromatics by using Fischer-Tropsch synthesis exhaust. The method includes conducting an olefin conversion reaction on Fischer-Tropsch synthesis exhaust under the action of a first molecular sieve catalyst. A first refrigeration or cooling is conducted on an obtained product to obtain ultralow sulfur-containing gasoline and first-stage reaction gas. An alkaline aromatization reaction is conducted on the first-stage reaction gas under the action of a second molecular sieve catalyst. A second refrigeration or cooling is conducted on an obtained product to obtain aromatics. After the olefin conversion reaction, a gasoline component is separated and residual alkanes enter a second-stage fluidized bed reactor for the alkane aromatization reaction to produce aromatics. The present invention implements step conversion of different components in the Fischer-Tropsch exhaust, and has advantages of high reaction yield, easy catalyst regeneration and amplification, and the like.

IPC Classes  ?

• C10G 2/00 - Production of liquid hydrocarbon mixtures of undefined composition from oxides of carbon
• C10L 1/06 - Liquid carbonaceous fuels essentially based on blends of hydrocarbons for spark ignition

Abstract

A method of producing a carbon core-graphene shell material is disclosed. The method can include obtaining a dispersion comprising a grafted graphene oxide material and a polymerizable carbon material dispersed in a liquid medium, polymerizing the polymerizable carbon material in the dispersion to obtain a grafted graphene oxide coated polymerized carbon material dispersed in the liquid medium, evaporating the liquid medium from the dispersion, and heating the grafted graphene oxide coated polymerized carbon material to obtain the carbon core-graphene shell material.

IPC Classes  ?

• C08J 3/12 - Powdering or granulating
• C08K 3/04 - Carbon
• C08L 33/20 - Homopolymers or copolymers of acrylonitrile
• B82Y 30/00 - Nanotechnology for materials or surface science, e.g. nanocomposites

Abstract

A controlled-release fertilizer composition, methods of making, and uses thereof are described. The controlled-release fertilizer composition includes a composite graphene-carbon nanotube material having a three-dimensional open-celled network of graphene and carbon nanotubes and a fertilizer impregnated in the three-dimensional open-celled network of graphene and carbon nanotubes.

IPC Classes  ?

• C05G 3/00 - Mixtures of one or more fertilisers with additives not having a specifically fertilising activity
• C05G 1/00 - Mixtures of fertilisers covered individually by different subclasses of class

Abstract

Methods for producing a carbon material -graphene composite are described. A method can include obtaining a dispersion comprising a graphene oxide material and a carbon material dispersed in a liquid medium, evaporating the liquid medium to form a carbon material- graphene composite precursor, and annealing the composite precursor at a temperature of 800 °C to 1200 °C in the presence of an inert gas to form the carbon material -graphene composite. The graphene oxide material can be grafted graphene oxide. Flexible carbon material -graphene composites are also described. The composites can have a polyacrylonitrile (PAN)-based activated carbon attached to a graphene layer, have a surface area of 1500 m2/g to 2250 m2/g, and a bimodal porous structure of micropores and mesopores.

IPC Classes  ?

• C01B 32/354 - After-treatment
• C01B 32/318 - Preparation characterised by the starting materials
• C01B 32/342 - Preparation characterised by non-gaseous activating agents
• C01B 32/184 - Preparation
• H01G 11/40 - Fibres
• H01G 11/34 - Carbon-based characterised by carbonisation or activation of carbon