39results about How to "Give full play to the catalytic performance" patented technology

The present invention discloses a preparation method for a composite oxide carrier. According to the method of the present invention, a composite oxide dry glue is prepared by the following steps, wherein the steps comprise: firstly preparing an aluminum hydroxide wet filter cake and an aqueous solution containing an IVB group metal complex; adding the wet filter cake to the complex solution, andstrongly stirring; carrying out filtering and drying to obtain the composite oxide dry glue. With the composite oxide dry glue prepared by the method, most of the IVB group metal oxide can be distributed on the surface of aluminum oxide so as to reduce the influence on the pore structure of the aluminum oxide, improve the assistant catalysis effect of the IVB group metal oxide, and improve the pore structure and the surface performance of the composite oxide carrier. In addition, with the present invention, the sulfurization performance of the catalyst adopting the composite oxide carrier as the carrier can be improved, and the loaded active metal is easy to reduce.

The invention discloses a hydroisomerization pour-point-depressing deep-coupling process for producing low-pour-point diesel oil. The process comprises the following steps: mixing a diesel oil raw material and hydrogen; then successively allowing the mixture to pass through at least two tandem hydrogenation reaction zones, wherein each hydrogenation reaction zone successively includes a composite catalyst bed layer filled by a mixture of a hydrodewaxing catalyst and a hydro-upgrading isomerization pour-point-depressing catalyst, and a hydrofining catalyst bed layer according to a flow direction of the materials; and finally, subjecting an obtained reaction effluent of the last hydrogenation reaction zone to separation and fractionation so as to obtain the low-pour-point diesel oil. The method provided by the invention reasonably utilizes temperature rise in upgrading pour-point-depressing process and temperature drop in hydrodewaxing process, so clean low-pour-point diesel oil is produced; meanwhile, the yield and cetane number of the diesel oil are improved; hot-spot temperature of a device is reduced; and operation cycle is prolonged; moreover, consumption of cooled hydrogen and fuel gas loss of a heating furnace are reduced, and operation cost is saved.

The invention discloses a preparation method of a composite oxide carrier. A composite oxide gel adopted in the method of the invention is obtained by the steps of: first preparing an aluminum hydroxide sol and a water solution containing a group IVB metal complex, then mixing the sol and the water solution, adding dropping a hydrolysis promoter so as to obtain a mixed precipitate, which is then subjected to aging, washing, filtering and drying. The composite oxide gel obtained by the method can make most of group IVB metal oxides distributed on an alumina surface so as to weaken influence onan alumina pore structure, enhance the catalysis assisting effect of group IVB metal oxides, and improve the pore structure and surface performance of the composite oxide carrier. Therefore, the vulcanizing property of a catalyst with the carrier of the invention can be improved, and loaded active metals are easy for reduction.

The invention provides a method for modifying a three-dimensional graphene confinement high-volume hydrogen-storage material by an iron-based catalyst. The method comprises the following steps: respectively dissolving ferric nitrate or partial other metal-added nitrate and polyvinylpyrrolidone in deionized water to prepare a mixed solution, placing the mixed solution in an air-blast drying box forcomplete drying, grinding the material to powder, and transferring the ground powder to a tubular furnace for primary pre-burning or secondary heat treatment to obtain a black foamed product which isthe iron-based catalyst modified three-dimensional graphene confinement high-volume hydrogen-storage material; and compositing the iron-based catalyst modified three-dimensional graphene and a hydrogen-storage alloy to obtain the modified three-dimensional grapheme confinement high-volume hydrogen-storage material. A series of the iron-based catalyst modified three-dimensional graphene confinement high-volume hydrogen-storage materials can be prepared by controlling the reaction conditions, the method is novel, the production period is short, the cost is low, and the hydrogen-storage materialhas the advantages of strong repeatability and large-scale preparation, and has good industrial prospect on the field of hydrogen storage.

The invention discloses a method for preparing chiral aromatic secondary alcohol. It comprises following steps: a. oxiding racemic aromatic secondary alcohol in beta- cyclodextrin containing water phase into relevant aromatic acetone by using chemical oxidant, reaction time is 6- 24 hours; b. adding reducant additive for reaction for 30 minutes, adding basic substance to moderate pH to 7.0; c. putting the quiescent cell of Rhodotorula sp.)ECU316-1 CGMCC NO.1735 into said solution to catalyze and oxide aromatic acetone into (S)- aromatic secondary alcohol; d. isolating and purifying reaction solution and getting target product. The invention combines chemical and biological method to converse racemic aromatic secondary alcohol to chiral aromatic secondary alcohol with high optical purity (above 99%). It is characterized by temperate reaction condition, simple operation, easy to prepare catalysy and good industrial development prospect.

The invention discloses a method for producing a high-calorific-value combustible gas through in-situ catalysis of a biomass pyrolysis volatile component to remarkably improve the content of CH4 in the gas and greatly increase the calorific value of the produced gas. The specific method is that the biomass volatile component is subjected to an isothermal synchronous in-situ catalysis methanation reaction through a perovskite catalyst in a catalyst position, the contents of CO2, CO and H2 in the combustible gas are reduced after the reaction, the content of CH4 is increased, the calorific value and the value of the produced gas are improved, and the high-calorific-value combustible gas with high quality is obtained, wherein the perovskite catalyst comprises an active ingredient and carrier ingredients in percentage by mass, the active ingredient is LaAxB(1-x)O3, A is a transition metal like Fe, Cu, Zn, Zr, Mn and Co, B is Ni, Ce, Ru and Rh, x is between 0 and 1 and is 1-15%, and the carrier ingredients are Al2O3, TiO2, ZrO2, SiO2, cordierite, honeycomb ceramics, hydrotalcite, and SBA-16 mesoporous molecular sieve. In addition, the catalyst adopted in the method further has the advantages of high activity, simple preparation, low cost, good anti-carbon property, high stability, and the like.

The invention provides a preparation method and application of a C3N4 modified organic membrane. The preparation method includes: step 1) adding nitrogen carbide CN and a pore-forming agent into an organic solvent, wherein the mass ratio of CN to the pore-forming agent is 0.4:1-2.5:1, and the mass ratio of the pore-forming agent to the organic solvent is 1:81-1:87; carrying out ultrasonic treatment to obtain a mixed solution, then adding a polymeric membrane material PFM into the mixed solution, with the PFM accounting for 12-15% of the total mass of the PFM and the mixed solution, performingstirring at a constant temperature, and conducting standing and defoaming to form a membrane casting solution; and 2) pouring the prepared membrane casting solution to one side of a clean and dry glass plate, scraping a liquid membrane by a square coater, immersing the glass plate subjected to liquid membrane scraping into deionized water for phase exchange, solidifying the membrane casting solution into a membrane, then taking the membrane out, also soaking the membrane in deionized water, and removing the residual organic solvent to obtain the C3N4 modified organic membrane. According to themethod, the organic membrane has the capability of catalytic degradation of organic matters, and the anti-pollution performance of the membrane is improved.

The invention discloses a biodiesel esterification heterogeneous catalyst and a preparation method thereof. The catalyst is an MIL-100/AILs@ZIF-8 catalyst with a core-shell structure adopting MIL-100/AILs particles as a core phase material and ZIF-8 as a shell phase material. Preparation methods of MIL-100, AILs, MIL-100/AILs and MIL-100/AILs@ZIF-8 are introduced. The catalyst can be used to synthesize biodiesel. The catalyst has the advantages of high catalysis activity, difficult inactivation, easiness in separation, cycle use, environmental protection and high selectivity.

The invention discloses a process for removing methyl mercaptan from carbon dioxide gas, and the method comprises the following steps of: 1, uniformly mixing the carbon dioxide gas containing the methyl mercaptan with air to obtain a mixed gas, wherein the molar ratio of oxygen to methyl mercaptan in the mixed gas is (0.6-2.5): 1; and 2, reacting the mixed gas under the action of a methyl mercaptan removal catalyst to obtain carbon dioxide gas with the volume content of sulfur not exceeding 0.1 ppm, wherein the methyl mercaptan removal catalyst is prepared from a waste zinc oxide desulfurizer,a zinc salt, a manganese salt, a potassium salt and a binder. According to the invention, the carbon dioxide gas containing the methyl mercaptan is uniformly mixed with the air to react under the action of the methyl mercaptan removal catalyst, and the methyl mercaptan is converted into hydrogen sulfide and absorbed by the methyl mercaptan removal catalyst by controlling the molar ratio of the methyl mercaptan to the oxygen, so that the removal of the methyl mercaptan in the carbon dioxide gas is realized, the generation of an impurity gas is avoided, and the removal effect of the methyl mercaptan in the carbon dioxide gas is greatly improved.

The invention belongs to the technical field of environmental protection, and particularly relates to an intelligent industrial waste gas purification device. The device comprises a first fixing frame, a second fixing frame, an inner tube, an outer tube, a lamp tube, a fan, a first gas hood and a second gas hood, wherein the inner tube and the outer tube are both erected between the first fixing frame and the second fixing frame, the inner tube is sleeved with the outer tube, and a cavity between the inner tube and the outer tube is a purification flow channel; the fan is fixed at one end of the first fixing frame; the first gas hood is fixed at one end of the fan; the second gas hood is fixed at one end of the second fixing frame; the lamp tube is fixed in the inner tube along the axial direction; a photocatalyst layer is arranged on the inner wall of the outer tube; the outer wall of the outer tube is coated with a light reflection layer; and the inner tube is made of a light-transmitting material. The device is simple in structure, convenient to use and maintain and good in purification effect, energy and mass exchange among the catalyst, VOC waste gas and photons is fully considered, the efficient photocatalyst is deeply developed, and certain intelligent improvement is carried out.

The invention discloses a preparation method of high-purity 1-butene, which comprises the following steps of carrying out dimerization reaction with higher activity on ethylene in a binary catalyst system with a Ti-O bicyclic structure by controlling the reaction pressure, temperature, catalyst ratio and retention time to generate an intermediate product with the 1-butene content of 90% or above, and carrying out pressurized rectification, and separating a 1-butene product with the purity of more than or equal to 99.47% from the tower top. The product can be directly used for polyethylene comonomers.