57results about How to "No deactivation" patented technology

The invention belongs to the field of magnetic catalysts, and particularly relates to Ag-Fe3O4 magnetic nano-catalysts compounded under the action of polymers and their application in a styrene catalytic epoxidation system. The synthesis method is to use Fe3Cl6·6H2O and AgNO3 as raw materials to synthesize Ag-Fe3O4 composite magnetic nano-catalyst in ethylene glycol system containing NaAc by solvothermal technology with the assistance of polymer PVP; this catalyst can be used to use TBHP as oxidant, Styrene epoxidation system with toluene as solvent. The preparation method of the present invention is simple, the reactants are cheap and easy to obtain, the solvent pollution is small, the synthesis time is low, the catalyst can be conveniently separated from the reaction system under the action of an external magnetic field, and the problem that the non-magnetic nano-catalyst is difficult to recover is solved. The catalyst showed excellent catalytic activity and stability for styrene epoxidation, the yield of ethylene oxide was 84.0%, and there was no deactivation phenomenon after repeated use.

A method for catalyzing and synthetizing modified stevioside by using microwave auxiliary cyclodextrin glucosyltransferase relates to the technical field of biosynthesis of organic compounds, and comprises the following steps: taking stevioside aqueous solution and starch hydrolyzates as raw materials, and synthetizing stevioside replaced by glucose residue under the combined action of microwave radiation and CGTase catalysis in a microwave reaction device. In the process condition provided by the invention, enzyme catalysis reaction can be remarkably quickened, and the phenomenon that microwave of a water system enable enzyme to be inactive under the usual condition. Through tasting, the bitter taste of the synthetic modified stevioside is greatly reduced.

The invention provides a multi-component precious metal loaded type nano catalyst in which cobalt oxide is loaded to an oxide carrier, a preparation method and application thereof. The preparation method is characterized in that a coprecipitation method is carried out; precious metal crystal seeds are loaded on an alkaline cobalt carbonate nanoparticle precursor in an ethylene glycol system; the reacted product is centrifugally dried to obtain precious metal loaded type cobalt oxide nanoparticles. According to the preparation method, the precious metal loaded cobalt oxide with a heterostructure is synthesized, so that the essence and composition of active sites of the precious metal loaded type cobalt oxide nano catalyst are influenced; the prepared materials are loaded on the oxide carrier through a liquid-phase mixing method, so that the dispersing degree of the precious metal loaded type cobalt oxide can be improved, and moreover, the problem of high cost caused by previous metal can be reduced. The preparation method of such material is simple and easy to operate, consistent in shape, high in stability, and low in cost, and shows high methane low-temperature oxidizing activity while being applied to methane combustion reaction, and has a certain industrial application prospect.

The invention discloses a RuCo alloy catalyst capable of breaking a restrictive relationship, a preparation method of the RuCo alloy catalyst and an application of the RuCo alloy catalyst to ammonia synthesis. The RuCo alloy catalyst comprises a nitrogen-doped carbon carrier and active metals Ru and Co loaded on the carbon carrier. According to the invention, the highly dispersed RuCo alloy monatomic catalyst is synthesized by a reduction method; according to the catalyst, Ru and Co have a synergistic effect; dissociation of N2 and desorption of NHx are promoted to occur on different active sites; therefore, the restrictive relationship existing in the synthetic ammonia reaction is broken through; the obtained RuCo alloy monatomic catalyst has excellent synthetic ammonia catalytic performance under a mild condition; the ammonia synthesis rate reaches 11.2 mmol NH3/(gcat.h) under the condition of 400 DEG C, the catalyst has extremely high catalytic stability, meanwhile, the preparationmethod of the catalyst is simple, the utilization rate of metal atoms is high, and the catalyst has obvious industrial application value.

A process and its reactor for preparing CO and H2 from methanol feature that the CuO/ZnO/Al2O3 series catalyst is used and the reaction takes place at 160-330 deg.C, under 0-3 MPa and with 0.1-3 /h for space velocity of methanol, preferably 0.5-2.0 /h.

The invention discloses a method for preparing a fluorinated compound CFR1=CFR2 (R1, R2=F or -CF3) through trifluoromethane thermolysis. The method comprises the following steps that under the condition of no catalyst, trifluoromethane takes a gas phrase reaction with CH4, NH3, H2O or hydrogen gas to obtain the fluorinated compound under the reaction conditions that the reaction pressure is 0.1 to 1.5 MPa; the reaction temperature is 700 to 1000 DEG C; the mol ratio of the trifluoromethane to any one or several kinds of materials of CH4, NH3, H2O or hydrogen gas is (1:0) to (1:40); and the dwell time is 0.1 to 50s. The method provided by the invention has the advantages that the raw materials can be easily obtained; a catalyst does not need to be used; the operation and the control are easy; in addition, the experiment repeatability is high; and meanwhile, the conversion and reutilization of HFC-23 are well realized.

The invention discloses a core-shell iron-based catalyst for directly producing aromatic hydrocarbon from synthesis gas. According to the catalyst, a nano ZSM-5 molecular sieve with the silica-aluminaratio of 30-200 is used as a shell layer, and surface pre-modified nano metal oxide particles are used as a core; the particle size of the nano metal oxide is 1-3 nm, the nano metal oxide is uniformly distributed, and the content of metal elements is 0.1-7% wt; wherein the aromatic hydrocarbon is C7-C11 aromatic hydrocarbon. The catalyst provided by the invention has high CO conversion rate and high aromatic hydrocarbon selectivity; the CO conversion rate can reach 42.6%; the selectivity of aromatic hydrocarbons in total hydrocarbons reaches 47.6%; the content in an oil phase reaches 78.1%; in addition, aromatic hydrocarbon products are concentrated, the selectivity of by-products CO2 and CH4 is low, the CO2 selectivity is only about 18.9%, the CH4 selectivity is only about 14.0%; the problems that the aromatic hydrocarbon selectivity and yield are low, the selectivity of by-products CO2 and CH4 is high, and the CO utilization rate is low are solved.

The invention discloses a carbon nanotube and hydrogen production system and method with autocatalysis function. The production system includes a quartz sand feeding device, a moving bed reactor, a heat exchanger, an ultrasonic separation device, a carbon nanotube purification device, a methane gas cylinder and a hydrogen storage tank. The moving bed reactor is adopted, cheap and easily availablemethane gas is taken as the carbon source, natural quartz sand is used as an unconventional catalyst for catalytic cracking to produce carbon nanotubes and high purity hydrogen at the same time, alsothe carbon nanotubes loaded on the surface of natural quartz sand are separated and purified, quartz sand does not inactivate in the reaction process as an unconventional catalyst, and shows increasingly high catalytic efficiency with the proceeding of the reaction, and catalyzes methane cracking to rapidly produce carbon nanotubes with large length-diameter ratio, controllable length and high geometric dimension consistency at low cost. The reaction by-product is high purity hydrogen, which can be used as a high value-added raw material of downstream industry, thus further improving the economical efficiency of the whole system.

The invention discloses a catalyst used for power plant coal-fired flue gas SCR denitration and a preparation method. The catalyst comprises TiO2 and active components. The catalyst is characterized in that: the TiO2 accounts for 80% of the total weight of the catalyst, and the active components comprise V2O5 and WO3, with the V2O5 up to 0.2-2% of the total weight of the catalyst, and the WO3 of 5-10% of the total weight of the catalyst. The preparation method of the catalyst used for power plant coal-fired flue gas SCR denitration consists of three steps of: preparing tungsten titanium powder, loading the active components and adding other additives, drying and roasting the catalyst. The method of the invention substantially improves the catalyst performances, and the toxicity resisting ability of the catalyst to substances like arsenic and alkali metals is greatly enhanced.

The invention relates to a copper-carried catalyst used for catalyzing hydrogen peroxide or oxidizing benzene to phenol, the preparation and the application thereof. Phenol is an important chemical raw material and also a precursor for preparing Bisphenol A, carbonic ester, phenolic resin, polycaprolactam, detergents, fungicides, herbicides, dyes, adhesives, antioxidants and a plurality of other compounds. Industrially, the demand of the phenol is great, and the world demand exceeds 6.6 multiplied by 10<7> tons per year and increases at the speed of 7 percent to 10 percent annually. A plurality of synthetic routes of the phenol are developed to meet the increasing demand of the phenol. The catalyst takes SBA-16 meso-porous molecular sieve as a carrier and carries transition metal copper, the content of which is 4 percent to 10 percent of the weight of the carrier. The catalyst is applied in the chemical field, namely, oxidizing benzene to phenol directly.

The invention discloses a Sn-Mn-Ce-La catalyst. A preparation method of the catalyst comprises the following steps: 1) weighing and dissolving metered Mn(NO3)2, Ce(NO3)3*6H2O, La(NO3)3*6H2O and citric acid in water to obtain a mixed solution, and stirring the mixed solution at the constant temperature of 50-80 DEG C for 5-10 hours to obtain a yellow jelly-like substance; 2) drying the yellow jelly-like substance, adding an aqueous SnCl2*2H2O solution, stirring sufficiently, adding ammonia water dropwise and regulating PH to 9-10 to obtain a precipitate and a mother liquor; and 3) filtering, washing and drying the precipitate and roasting the precipitate in air to obtain the Sn-Mn-Ce-La composite oxide catalyst. The catalyst has higher low-temperature catalysis to eliminate the activity, chlorobenzene can be converted completely at the temperature of 190 DEG C-210 DEG C, and inactivation does not occur when continuous reaction is performed for 30 hours at the temperature of 250 DEG C-300 DEG C.

The invention relates to the technical field of catalysts, in particular to a hydrogenation catalyst and a preparation method and application thereof. The hydrogenation catalyst comprises a metal oxide carrier and an active component loaded on the metal oxide carrier, wherein the active component comprises a Cu elementary substance and/or an oxide of copper; the metal oxide carrier comprises a subgroup metal oxide or a subgroup composite metal oxide; the subgroup metal oxide comprises cerium oxide, titanium oxide, zirconium oxide or zinc oxide; the subgroup composite metal oxide comprises a composite oxide of two or more of cerium oxide, titanium oxide, zirconium oxide and zinc oxide. When the hydrogenation catalyst is used for catalyzing dimethyl oxalate hydrogenation to directly preparemethyl glycolate, the catalytic activity is high, the selectivity to methyl glycolate is high, and the stability of the structure and the performance of the hydrogenation catalyst in the long-term useprocess is high.

The invention provides a catalyst for oxynitride removing reaction by using methane, as well as a preparation method thereof. The catalyst is characterized in that a carrier of the catalyst is an H-Beta/Mordenite double-micropore molecular sieve; an active ingredient is cobalt; the weight percentage of the cobalt is between 0.5 and 10 percent; and the weight percentage of H-Beta/Mordenite is between 90 and 99.5 percent. The preparation method for the catalyst adopts an ion exchange method, which is to put H-Beta/Mordenite double-micropore molecular sieve powder into cobalt acetate solution with the concentration of between 0.005 and 0.03mol/L to react for 24 hours at 90 DEG C, wash, filter, dry and roast the powder to obtain the catalyst. The catalyst can allow the conversion rate of oxynitride to reach over 90 percent, has no inactivation phenomenon after maintaining activity for 72 hours, is wide in the operation interval (between 400 and 650 DEG C) of reaction temperature, and shows good performances of resisting water and sulfur at the same time.

The invention discloses a coke oven gas hydrogenation and desulfurization catalyst. Al2O3 is used as a carrier for the coke oven gas hydrogenation and desulfurization catalyst, Mo is used as an activecomponent for the coke oven gas hydrogenation and desulfurization catalyst, Si is used as a first accelerator for the coke oven gas hydrogenation and desulfurization catalyst, B and/or P are used assecond accelerators for the coke oven gas hydrogenation and desulfurization catalyst, the Mo active component exists in the form of MoO3, the first accelerator Si exists in the form of SiO2, the second accelerators exist in the form of second accelerator oxide, the second accelerator P exists in the form of P2O5, and the second accelerator B exists in the form of B2O3. The invention further provides a method for preparing the coke oven gas hydrogenation and desulfurization catalyst. The method includes preparing silicon-molybdenum co-impregnation liquid; carrying out drying and calcining to obtain the coke oven gas hydrogenation and desulfurization catalyst. The coke oven gas hydrogenation and desulfurization catalyst can be directly used without being calcined. The coke oven gas hydrogenation and desulfurization catalyst and the method have the advantages that the coke oven gas hydrogenation and desulfurization catalyst is a silicon-molybdenum catalyst and is high in initial activityand good in heat resistance, the method is simple and is convenient to operate, and industrial production can be facilitated; the accelerators do not need to be vulcanized before being used, and accordingly the usage amounts of vulcanizing agents can be reduced.

The invention discloses a copper carbonate loaded titanium dioxide ultraviolet photocatalyst and a preparation method thereof. The photocatalyst comprises the following raw materials in parts by weight: 1 part of titanium dioxide, 0.2-0.5 part of inorganic carbonate and 0.001-0.5 part of inorganic copper salt. The method comprises the following steps: firstly, dissolving inorganic carbonate in water to obtain an inorganic carbonate aqueous solution with the molar concentration of 0.1-1.0 mmol/L; secondly, dispersing titanium dioxide in the inorganic carbonate aqueous solution to obtain suspension liquid; finally, slowly adding the inorganic copper salt into the suspension liquid obtained in the step (3), uniformly stirring, washing and standing, filtering by filter paper, and drying in vacuum at 60-100 DEG C for 4-8 hours to obtain the copper carbonate loaded titanium dioxide ultraviolet photocatalyst. Compared with a conventional load technology, the loads of transition metal oxides all need to be electrically calcined, and in the method, the preparation cost does not exist and the electrical energy does not need to be used; the preparation cost of the photocatalyst meets the condition that the cost of each 500 g of the photocatalyst is increased by less than 0.5 yuan on the basis of the cost of titanium dioxide.

The invention discloses a catalyst for preparing butanol through ethanol coupling, the active component of the catalyst is a CuNiAl composite oxide, the content of Cu is 0.1-20 wt%, the content of Ni is 25-65 wt%, the content of Al is 5-35 wt%, and the molar ratio of Ni to Al is 3: 1-1: 3; the catalyst is prepared by adopting a coprecipitation method or a deposition precipitation method, a metal salt of copper and nickel-aluminum precursor solutions with different molar ratios are mixed, an obtained mixed solution is aged under the condition that the temperature and pH are controlled, and the catalyst is obtained through washing, drying, roasting and grinding treatment. The invention also discloses a preparation method and application of the compound. The invention provides an efficient, stable and cheap catalyst for preparing butanol through ethanol coupling, and high activity, high selectivity and stability of the catalyst are realized under mild reaction conditions.

The invention discloses a preparation method of a rare earth metal Nd doped H-ZSM-34 molecular sieve, the preparation method comprises the following steps of: adding an aluminum source into water, continuously adding an alkali source and a silicon source, stirring and aging to obtain a clear seed crystal solution; sequentially adding sodium hydroxide and water-soluble silica gel into an aqueous solution, stirring, then sequentially adding aluminum sulfate crystals and the seed solution to obtain a precursor solution; adding a Nd(NO3)3.6H2O solid in the precursor solution, stirring at room temperature, putting the mixture into a kettle, crystallizing, taking out of the kettle, filtering by suction, washing, drying and roasting in air to obtain Nd-doped Na-ZSM-34; adding the Nd-doped Na-ZSM-34into an ammonium nitrate solution, stirring, filtering by suction, washing and drying; and repeating ammonium exchange four times to obtain NH4-ZSM-34, and roasting the NH4-ZSM-34 in the air to obtain the rare earth metal Nd doped H-ZSM-34 molecular sieve. The rare earth metal Nd doped H-ZSM-34 molecular sieve prepared by the method has the advantages of unique pore structure, suitable acidity,good stability, larger specific surface area and the like.

The invention discloses a tin-manganese-titanium catalyst. A preparation method of the tin-manganese-titanium catalyst comprises the following steps: 1) adding a precipitating agent and a dispersant into an aqueous solution of a mixture of SnCl2-H2O(1/2), Mn(NO3)2 and Ti(SO4)2, and fully stirring at 20 DEG C-90 DEG C for 5 h-15 h to obtain a brown deposition and a mother liquor; 2) continuing aging the deposition in the mother liquor for 0.5 h-2 h, filtering and washing the filtrate to be neutral with water, drying the deposition, and roasting in air to obtain the tin-manganese-titanium composite oxide catalyst. The catalyst has the advantages of being low in raw material cost, simple in preparation technology, low in energy consumption, low in temperature of eliminating aryl chlorides, high in efficiency, free in secondary pollution, long in service life, strong in anti-positioning capability and the like, and is extremely suitable for complete catalytic combustion of volatile aryl chlorides atmosphere pollutants in low temperature.

The invention relates to a nickel-lanthanum oxide catalyst for methane dry reforming, the active component of the catalyst is metal Ni, the carrier is La2O3, and an obvious Ni-La interface is formed between the active component and the carrier; the weight percentage of the active component Ni is 1.0-5.0%, and the size of Ni nano-particles is about 20 nm; and the weight percentage of the carrier La2O3 is 95.0 to 99.0 percent. Meanwhile, the invention also discloses a preparation method of the catalyst. The catalyst shows very high catalytic stability, so that the problems of high-temperature sintering and carbon deposition of active components are effectively solved.

The invention belongs to the technical field of application of novel catalytic materials, and particularly relates to a phosphorus-doped nickel aluminum oxide as well as a preparation method and application thereof. The preparation method comprises the following steps: carrying out high-temperature aerobic roasting on a nickel-aluminum-based hydrotalcite-like compound to obtain a nickel-aluminum oxide; mixing the nickel-aluminum oxide with a phosphorus source, and heating the mixture under the protection of inert gas or under a vacuum airtight condition; and adding phosphorus into the nickel-aluminum oxide to finally prepare the phosphorus-doped nickel-aluminum oxide. The preparation method comprises the following steps: carrying out high-temperature aerobic roasting on a nickel-aluminum-based hydrotalcite-like compound to construct Ni-Al interaction; and then, through doping of P in the nickel aluminum oxide, Ni-P interaction is constructed. Based on the synergistic interaction of Ni-Al and Ni-P, the regulation of electrons around P active metal is realized, so that the P active metal is balanced in an intermediate state between a metal simple substance and phosphide. Therefore, inactivation factors such as metal agglomeration, carbon deposition and phase change are inhibited, and excellent catalytic activity, selectivity and stability are shown.

The invention discloses a preparation method of a snowflake-shaped H-ZSM-5 molecular sieve. The method comprises the steps: adding a silicon source in an aqueous solution, adding an aluminum source, atemplate and an alkali source continuously, performing even stirring and mixing so as to form a mixture colloid, then performing crystallization on the mixture colloid for 48 hours, performing suction filtration, water washing and drying, performing roasting so as to obtain a snowflake-shaped ZSM-5 molecular sieve, adding the snowflake-shaped ZSM-5 molecular sieve at a solid-liquid ratio of 1 g:100 mL to an 0.5 mol/L ammonium nitrate aqueous solution, performing stirring for 8 h, performing suction filtration, water washing and drying, and conducting roasting so as to prepare the target product snowflake-shaped H-ZSM-5 molecular sieve. The prepared snowflake-shaped H-ZSM-5 molecular sieve has the advantages of a unique pore structure, suitable acidity, good stability, a large specific surface area and the like, and has good catalytic performance for methanol catalysis in a propylene preparation reaction and a long service life.