617results about How to "Improve reaction stability" patented technology

The invention relates to a catalyst for dehydrogenating propane to prepare propone, which uses thermal-resistant oxide as carrier, uses palladium-group metal as main catalyst, uses IV A group metal and rare-earth metal as agents, uses halogen as modifier, and uses inorganic oxide with high temperature resistance as adhesive. The inventive catalyst under high temperature and low pressure has higher propane transfer rate, propone selectivity and reaction stability. And the preparation comprises that at 60-100Deg. C, immerging thermal-resistant oxide with rare-earth metal water solution for 2-10h, at 60-180Deg. C baking for 2-10h, at 400-600Deg. C baking for 3-10h, immerging said carrier and the water solution which contains palladium metal and IVA metal at 60-100Deg. C for 2-10h, and baking for 2-10h at 60-180Deg. C, adding adhesive, protruding agent and acid gel solvent, protruding and shaping, baking for 2-10h at 60-180Deg. C, activating for 3-10h at 400-600Deg. C, and reducing for 2-10h in hydrogen flow at 400-600Deg. C.

The invention relates to an iron catalyst used in butadiene production through n-butylene oxidation dehydrogenation, and a preparation method and an application thereof. The catalyst comprises Fe as a main component, and a co-catalyst comprising Mg, Zn, and other elements. The catalyst is composed of, by mass, 48.80-60.53% of Fe, 0.01-18.00% of Mg, 0-15.00% of Zn, 0-5.00% of other elements, and balance of oxygen element. The catalyst is prepared with a precipitation method. The catalyst is applied in butadiene production through n-butylene oxidation dehydrogenation by using an adiabatic fixed bed. Application conditions comprise: adiabatic fixed bed material inlet temperature is 260.0-445.0 DEG C; molar ratio of inlet oxygen to n-butylene is 0.42-0.90; molar ratio of inlet water to n-butylene is 12.0-25.0; inlet n-butylene volume space velocity is 180-600h<-1>, and an adiabatic fixed bed material outlet temperature is 457.0-650.0 DEG C. Compared with prior arts, the catalyst provided by the invention is suitable for an adiabatic fixed bed, and has the advantages such as high butadiene selectivity, good catalyst reaction stability, and the like.

The invention discloses a technology for preparing organic fuel through directly converting carbon dioxide by using sunlight and a photothermal catalyst. Sunlight is utilized to supply light and heat for the synthesis and catalytic process of the photothermal catalyst, and the photothermal catalyst can simultaneously absorb and utilize ultraviolet light, visible light and infrared light parts in sunlight, so that a phtothermal catalytic reaction is induced to prepare the organic fuel through reducing carbon dioxide by using hydrogen. The photothermal catalyst comprises the following components: an active component which is a 2-30 nano-scale non-stoichiometric oxide belonging to a VIII-family element in a transition family and a carrier material which is an oxide or carbon material with the specific surface area of 30-1000cm<2>/g, alkaline resistance, high heat conductivity or photocatalytic activity. A steeping and in-situ sintering method or photodepositing and in-situ sintering method is used as a synthesis method so that the energy consumption is low, and the photothermal catalyst has high activity and long service life by using a solar-assisted in-situ sintering technology. The technology for preparing organic fuel through directly converting carbon dioxide by using sunlight and the photothermal catalyst is low in energy consumption in the catalytic process, high in organic fuel production efficiency and stable in catalyst activity.

A modified molecular sieve catalysts used for olefin aromatization reaction, make up of molecular sieve and adhesive, the adhesive weight is 20 ~ 80% of the catalyst weight. The molecular sieve park in the alkaline solution that the concentration of 0.01 - 5M at room temperature to 100 Deg C for 0.1-50 hours; After washing, drying, and extrusion molding with the adhesive, via ammonia exchange, drying, roasting under 400 ~ 1000 Deg C, obtaining the goal product. Compare With ordinary untreated catalyst, the invention of the modified molecular sieve catalysts show good mixed reaction olefin aromatization Stability.

The invention discloses a method for preparing ethylbenzene by reaction of dilute ethylene and benzene, which uses the dilute ethylene in dry gas of oil refinery as raw material, water washing and selective removal of propylene are conducted for the dry gas before the dry gas enters an alkylation reactor in sections, alkylation reaction of the dilute ethylene in dry gas and the benzene proceeds under the circumstances that zeolite catalyst exists, the dry gas and / or low-temperature gas-phase benzene are utilized for taking heat during the alkylation reaction, and the reaction temperature rising is reduced; after the vapor-liquid separation of the alkylation reaction product, tail gas is discharged from the device through low-temperature absorption, and cycle benzene, ethylbenzene, propyl benzene, diethylbenzene and heavy component are sequentially separated from the liquid product through a separation system; the diethylbenzene and the benzene are mixed and enter an anti-alkylation reactor and anti-alkylation reaction proceeds on molecular sieve catalyst for further converting to the ethylbenzene. The invention effectively reduces the benzene consumption and the energy consumption during the course of preparing ethylbenzene by dilute ethylene, the ethylene conversion rate is more than or equal to 99%, the total selectivity of generating ethylbenzene is more than or equal to 99%, the recovery rate of benzene carried by the tail gas is more than or equal to 99.5%, and the xylene content in the ethylbenzene is less than 800 ppm.

The present invention discloses a manganese-sodium-tungsten-silicon composite oxide oxidative coupling of methane catalyst containing or not containing titanium, obtained by loading manganese-sodium-tungsten onto a titanium-silicon molecular sieve or a pure silicon molecular sieve by means of a step-by-step impregnation method and calcination. The manganese-sodium-tungsten-silicon composite oxide catalyst containing or not containing titanium has the following structural formula: vMnO2·xNa2O·yWO3·zTiO2·(100-v-x-y-z)SiO2, the v, x, y, and z respectively representing the fractional quality occupied by metal manganese oxide, sodium oxide, tungsten oxide and titanium oxide, 0.3≤v≤16, 0.1≤x≤5, 0.6≤y≤21, 0.0≤z≤4. The manganese-sodium-tungsten-silicon composite oxide catalyst containing or not containing titanium set forth in the present invention is used for oxidative coupling of methane reactions, having excellent low-temperature catalytic activity and ethylene/propylene selectivity generation and reaction stability.

The invention discloses a catalyst used for preparing trifluoroethylene by hydrogenating and dechlorinating trifluorochlor oethylene, comprising a first catalyst, a second catalyst and an assistant, wherein the first catalyst is one or combination of more than two of palladium, ruthenium and platinum, the second catalyst is Fe and/or Cu, and the assistant is selected from one or combination of more than two of V, Bi and K. The invention also discloses an activated carbon carrier preprocessing method of the catalyst for preparing the trifluoroethylene by hydrogenating and dechlorinating the trifluorochlor oethylene and an application of the prepared catalyst in trifluoroethylene preparation. The catalyst prepared by the method disclosed by the invention has the advantages of high catalytic activity and catalyst efficiency, good trifluoroethylene selectivity, strong reaction stability, mild reaction condition, simple catalyst preparation and processing process and the like.

The invention provides an application of nanometer molecular screen in aromatic hydrocarbons alkylation reaction, and a method for generating mono-substituted, disubstituted and polysubstituted benzene by alkylation reaction of aromatic hydrocarbons with olefin hydrocarbon or alcohol on molecular sieve catalyst, wherein aromatic hydrocarbons is benzene, toluol, ethylbenzene or cumene; olefin hydrocarbon is ethylene, propone, butene or isobutene; alcohol is C1 to C4 aliphatic alcohol; molecular screen is high high crystallinity sheet MCM-22, MCM-49 or MCM-56 crystal powder in which the thickness is smaller than 50nm, and sizes is between 300 and 500nm.The nanometer molecular sieve catalyst provided in present invention has high conversion rate of alkylation reaction and high selectivity, and it has fine stability, which is capable of being used for manufacturing production.

The invention relates to a method for high selectively synthesizing dimethylbenzene through benzene and methanol alkylation reaction. The method takes the benzene as a raw material a, a toluene is taken as a raw material b, the methanol is taken as a raw material c, according to the molar ratio, a/c equals to 0.50-3.00/1.00, b/c equals to 0.60-3.00/1.00, under the conditions that the reaction temperature is between 380 and 480 DEG C, the reaction pressure is between 0.50 and 6.0 mega pascals, the reaction space velocity is between 0.5 and 5.0 h<-1> and the carrier gas is H2, N2 or CO2, the dimethylbenzene is produced in a fixed bed reactor under the catalysis of molecular sieve based catalysts, the catalysts are one or a plurality of molecular sieves of zeolite socony mobile-5 (ZSM-5), USY, mobile composite of matter (MCM)-22 or EU-1, a load metallic oxide is Mo, Ni or La metallic oxide, and the load of the metallic oxide is 0.50-10.00%. The method utilizes the benzene with relative surplus capacity and the inexpensive methanol to produce the dimethylbenzene with high industrial added value. The appropriate molecular sieve based catalyst is adopted, the utilization ratio of the methanol alkylation reaction for high selectively synthesizing the dimethylbenzene cannot be less than 90%, and the catalyst stability can satisfy industrial application requirements. Moreover, the toluene is added into the reaction raw materials, so that toluene byproducts can be inhibited from being produced; and in addition, an H2, N2 or CO2 carrier gas atmosphere is adopted, so that the reaction stability of the catalyst is enhanced.

The invention relates to the organic compound technical field, which solves the problems of poor stability of the silicone-acrylate copolymer emulsion and poor water resistance and stain resistance performances of a film due to low silicon content. The invention relates to a self-crosslinking silicone-acrylate copolymer emulsion which comprises the following components by mass percentages: 10.0-30.0% of methacrylic acid alkylester, 15.0-30.0% of alkyl acrylate, 5-15% of organosiloxane, 0.5-2.5% of alkyl ester, 1.0-5.0% of organosilicone hydrolysis inhibitor, 0.5-2.0% of pH modifier, 0.5-2.0% of emulsifier, 0.5-1.0% of initiator and 40.0-60.0% of water. The emulsion good reaction and storage stability, the silicon content used for constituting colloidal particles and its functional group distribution is gradually increased from 60-80% of colloidal particle radius to the surface, the organosilicone segment function can fully performed, and the cost performance of product is enhanced.

The invention discloses a platinoid bi-component catalyst as well as a preparation method and application thereof. In the catalyst, gamma-Al203 is taken as a carrier, platinum is taken as an active component, and copper is taken as auxiliary agent. The preparation method includes the following steps: dipping the carrier gamma-Al203 powder in Cu(NO3)2 water solution, removing solvent, drying and roasting, placing the obtained copper-loaded catalyst in H2PtCl6 water solution for dipping, removing solvent, drying and roasting, wherein the platinoid bi-component catalyst can be used in propylene preparation through propane dehydrogenation. According to the invention, copper and platinum in the catalyst interact to change the interaction force between the reactant and the metal surface and between the product and the metal surface, so that better reaction stability at a high temperature in propylene preparation through propane dehydrogenation is guaranteed, the dimethylmethane conversion ratio is higher, the propylene selectivity is excellent; different components of the catalyst can be dipped through the step-by-step dipping method, contents of the components can be controlled easily, and the repeatability is excellent.

The invention relates to a preparation method of a shell-core structure MOxSiO2, wherein the MOx is one of Mn3O4, Fe2O3, CeO2, Cu2O, or Co3O4. The preparation method comprises following steps: homogenously dispersing 0.01 to 0.1 mol of water-containing inorganic metal salt and 2 to 10 mL of oleic acid into 50 to 100 mL of absolute methanol, then putting the materials in a high-pressure reactor to subject the materials to crystallization reactions for 10 to 48 hours at the temperature of 120 to 240 DEG C, cooling and filtering so as to obtain MOx nano particles, dissolving the MOx nano particles in hexane, adding cetyl trimethyl ammonium bromide solution, subjecting the solution to an ultrasonic treatment, adding sodium hydroxide solution with a concentration of 0.5 M to 2 M, stirring, dropwise adding ethyl orthosilicate, carrying out the reactions at the room temperature for 10 to 24 hours, then subjecting the reaction product to a centrifugation treatment, washing, drying, and burning so as to obtain nano catalyst MOx@SiO2. The preparation method is simple and is easy to be applied to industrial production. The catalyst prepared by the preparation method is applied to the CO oxidation reaction, and has the advantages of low cost, and high activity and stability.

The invention discloses a catalyst for preparing alcohol through hydrogenation of acetic acid, and a preparation method of the catalyst. The catalyst is a multicomponent load catalyst and comprises ingredients a, b and c, and a carrier, wherein the ingredient a is one or more of calcium, potassium, sodium, barium, strontium, calcium oxide, potassium oxide, sodium oxide, barium oxide and strontium oxide; the ingredient b is one or more of tin, cobalt, molybdenum, nickel, iron, tin oxide, cobalt oxide, molybdenum oxide, nickel oxide and iron oxide; the ingredient c is one of platinum, palladium, ruthenium, rhodium, platinum oxide, palladium oxide, ruthenium oxide and rhodium oxide; the carrier is silicon dioxide, cerium dioxide, titanium dioxide, graphite, aluminum oxide or active carbon; and the mass ratio of the ingredient a to the ingredient b to the ingredient c to the carrier is (1-20):(0.5-2):(0.5-1):100. The multicomponent load catalyst is prepared by a multistep impregnation method, and used for preparing alcohol through the hydrogenation of acetic acid, and results prove that the catalyst is excellent in catalytical performance, long in service life and high in reaction stability.

The invention relates to a method for improving the selectivity and reaction stability of an arene product prepared in a methanol aromatization manner, and is used for preparing the arene in the methanol aromatization manner through the catalysis of a molecular sieve under the action of a carbon dioxide reaction medium. The method comprises the following steps: under the action of the carbon dioxide medium, by taking methanol as a raw material, preparing the arene in the methanol aromatization manner through a molecular sieve based catalyst containing a metal additive under the conditions that the reaction temperature ranges from 340 to 540 DEG C, the methanol reaction airspeed is maintained for 0.1 to 5.0 hours, the reaction pressure ranges from 0.1 to 5.0MPa and the molar ratio of the carbon dioxide to the methanol is 0.5-5.0 (mol/mol). According to the method, a large quantity of excess greenhouse gases, namely the carbon dioxide, serve as the reaction medium; the molecular sieve containing the metal additive serves as the catalyst, so that the selectivity and reaction stability of the arene in a methanol aromatization product are improved effectively. Thus, the method meets the requirement of an industrial application basically.

The invention provides a preparation method of an alcohol aromatization catalyst. The preparation method comprises treating a carrier ZSM-5 by acid or alkali so that ZSM-5 aperture sizes are increased, removing organic matter impurities on the carrier surface so that carrier surface purity is improved and hydroxyl-rich mesoporous HZSM-5 is obtained, putting the mesoporous carrier into a reaction chamber of an atomic layer deposition (ALD) device, and coating the surface of the carrier with one or more metal or metal oxide nanometer particles layer by layer by an ALD method. Through control of a reaction chamber substrate temperature, a metal source gasification temperature and unit circulating for repeating atomic layer deposition, catalyst metal carrying capacity and acidity are regulated and controlled. The alcohol aromatization catalyst has accurately controllable catalytic material carrying capacity and high carrier tunnel conformality, effectively inhibits catalyst carbon formation, sintering and active metal seepage, and further realizes alcohol aromatization reaction activity improvement and better reaction stability.

The invention relates to a process for preparing ethylene glycol by ethylene oxide catalytic hydration, wherein the solid acid catalyst employs niobium compounds as the main active components, at least one of germanium, tin, lead, antimony, phosphor, sulfur, ferrum and cobalt is used as the auxiliary agent for preparing ethylene alcohol at rather low water ratio conditions, the thermal energy needed for processing reacting excess water can be reduced substantially, the catalyst used possesses not only good activity, selectivity, but also fine steadiness.

The invention discloses a miniature movable type agricultural and forest biomass fast pyrolysis device. The device comprises a traveling mechanism (25), a combustion furnace (18), a feeder (21), a fast pyrolysis reactor (22), a gas solid separator (23), a gas condenser (11), a non-condensable gas purifier (24), a fan (16), a gas buffer tank (17) and a gas preheater (19); the height of the fast pyrolysis reactor (22) can be adjusted, the device can be suitable for various agricultural and forest biomass raw materials, and the fluidization quality in the reactor is better due to the arrangementof an inverted-cone-shaped gas flow stabilizer in a top cover of the reactor; the non-condensable gas is taken as gas sources of spouting gas and fluidized gas and heat supply fuel, the entire deviceis simple in structure, small in volume and stable in running, can be hauled to the agricultural and forest biomass for production intensively and has lower production cost; the small-scale movable type operating mode also avoids the problem that the industrial enlargement of a fluid bed reactor is not easy; and the industrial production of agricultural and forest biomass fast pyrolysis is realized in a disguised form.

The invention discloses a nickel-based catalyst as well as a preparation method and application thereof. The nickel-based catalyst has the following structural general formula: xNi.yCeAlO3.(100-x-y) Al2O3, wherein 1<=x<=20, 1<=y<=30. The catalyst is prepared by the following steps of: firstly, impregnating dried gamma-Al2O3 in a ceric salt solution at room temperature by using an incipient-wetness impregnation method, drying and roasting at the air atmosphere to obtain a modified carrier; then impregnating the modified carrier obtained at room temperature in a nickel salt solution by using the incipient-wetness impregnation method, drying and roasting at the air atmosphere to obtain a catalyst precursor; and finally, reducing the obtained catalyst precursor in hydrogen gas at 850-1050 DEGC. The catalyst provided by the invention has the advantages of strong coke resistance, good reaction stability and heat stability, high chemical and structural stability and the like and can be usedas the catalyst for preparing synthesis gas from methane.