60results about How to "Increase active site" patented technology

The invention belongs to the fields of material synthesis and energy technology, and especially relates to a graphene/metal oxide composite cathode material for lithium ion batteries and a preparation method thereof. Grapheme is dispersed into various metal oxide precursor salt solutions; a graphene/metal oxide compound is obtained directly by a hydrothermal method, or an graphene/metal oxide compound is obtained by a liquid in-situ polymerization method or a coprecipitation process; and the graphene/metal oxide compound is obtained by heat treatment or hydrothermal treatment. In the invention, the novel three-dimensional composite cathode material of graphene-coated metal oxide or graphene-anchored metal oxide is prepared by carrying metal oxide particles with graphene as a carrier. The obtained composite material can be used as a lithium ion battery cathode, which has a high specific capacity, excellent cycle stability and rate capability, and is expected to be used as a lithium ion battery cathode material with a high energy density and a high power density.

A catalyst based on MnOx/TiO2 system for low-temp selective catalytic reduction of NOx is proportionally prepared from alkoxy compound of Ti, alcohol solvent, water, protonic acid, soluble salt of Mn and the soluble salt of transition element through proportional mixing, stirring until sol becomes gel, drying, grinding and high-temp calcining.

The invention relates to a hydrogen evolution electrode, a preparation method and applications thereof. The preparation method specifically comprises: washing a foam metal foam nickel as a substrate,and electrochemically depositing a layer of a granular alloy containing one or more than two selected from nickel, cobalt and molybdenum on the surface; carrying out room temperature aging in a solution containing chlorine ions to from a layer of a nano-sheet-like hydroxide with a nano-scale thickness on the surface of the electroplating layer, wherein the hydroxide is corresponding to the electrodeposition metal; and electrochemically depositing trace platinum, and continuously carrying out room temperature aging to increase the thickness of the hydroxide so as to obtain the hydrogen evolution electrode with the multi-level pore channel structure. According to the present invention, the prepared hydrogen evolution cathode has the low platinum loading, has the excellent hydrogen evolutionmass specific activity at the platinum loading of lower than 10 [mu]g/cm<2>, and has good stability in the application of magnesium-water batteries.

The invention relates to a preparation method for a graphene-coated iron-loaded and nitrogen-loaded active site catalyst on a carbon nano tube (CNT); sources of raw materials used for the method are extensive; carbon source and nitrogen source materials are low in cost; the sample yield is high; the production cost of a fuel cell is helped to be reduced; the content of Fe and N in the prepared catalyst is controllable, and meanwhile, bigger specific surface area is kept so as to overcome the problem that metal nanometer particles are easy to aggregate in the past. The preparation method comprises the following steps: (1) supporting Fe and N to the surface of the carbon nano tube to obtain Fe-N-CNT; (2) synthetizing a composite material, formed by coating the surface of the Fe-N-CNT with graphene precursors, by a hydrothermal method; (3) calcining the composite material to obtain Fe-N-CNT&GN. Compared with a traditional fuel cell cathode Pt/C catalyst, the catalyst prepared by the method disclosed by the invention is low in cost, relatively higher in catalytic activity, high in stability, high in methanol tolerance, and has a good commercial application prospect.

The invention discloses a high-temperature-resistant methanation catalyst as well as a preparation method thereof. According to the catalyst, Al2O3 is used as a carrier, Ni is used as a primary active component, La and Ce are used as secondary components, and metallic oxides of Mn, Co, Fe, W or Mg are used as other active auxiliaries; the preparation method of the catalyst comprises the following steps: carrying out ultrasonic dispersion and coprecipitation on the primary active component Ni and a PEG (polyethylene glycol)-aqueous solution of a carrier precursor, and separating, drying and roasting to obtain a NiO-Al2O3 catalyst; then, loading the secondary components La and Ce and precursors of the active auxiliaries to the NiO-Al2O3 catalyst by adopting an incipient-wetness impregnation method; finally, roasting and carrying out reduction activation to obtain the high-temperature-resistant methanation catalyst; the catalyst has high specific surface area, and can reduce carbon deposition reaction and improve the selectivity of methane. The high-temperature-resistant methanation catalyst can maintain relatively high methanation catalytic activity for a long time at high temperatures and can be widely applied to a methanation process under a high-temperature environment.

The invention provides a preparation method of an oxidation catalyst taking a cerium-zirconium-silicon composite oxide as a carrier and application of the oxidation catalyst to the automotive vehicle emitted tail gas, and belongs to the technical field of automotive vehicle tail gas oxidation, catalysis and purification. The oxidation catalyst taking the cerium-zirconium-silicon composite oxide as the carrier is prepared by taking FeCrAl metal honeycomb or cordierite ceramic honeycomb as a matrix, taking a cerium-zirconium-silicon composite oxide as a coating and taking precious metal Pt and/or Pd as active substances. The carrier material of the prepared cerium-zirconium-silicon composite oxide is large in specific surface area, relatively large in pore volume and moderate in pore diameter, and is beneficial for increasing the active sites. For the hydrocarbon and the carbon monoxide in the automotive vehicle emitted tail gas, the prepared oxidation catalyst taking the cerium-zirconium-silicon composite oxide as the carrier has good oxidation catalytic activity, high conversion rate and low ignition temperature. At the same time, the preparation method is simple and suitable for industrial application.

The invention discloses a coked gasoline desilication catalyst and a preparation method thereof. The coked gasoline desilication catalyst disclosed by the invention contains an Al2O3-TiO2-B2O3 composite oxide as a carrier and Ni-Mo-W-Ce as an active component; the used Al2O3-TiO2-B2O3 carrier comprises the following components in percentage by weight: 10-20% of TiO2, 3-10% of B2O3, and the balance of Al2O3; and, in terms of the weight percentage of the catalyst, the active component comprises the following components in percentage by weight: 1.2-3.9% of NiO, 4.2-9.5% of MoO3, 5-15% of WO3, 1.5-2.5% of CeO2, and the balance of the carrier. The coked gasoline desilication catalyst disclosed by the invention is roasted in the atmosphere of water vapor, has a special pore diameter and higher pore volume, and is capable of effectively adsorbing and desorbing silicon impurities and protecting subsequent purification of the catalyst by mainly adding hydrogen into coked gasoline.

The invention discloses a removal method for dissolved oxygen in recycled water. The removal method comprises the following steps: enabling the recycled water with dissolved carbohydrazide to pass through a reactor filled with a combined modified activated carbon fiber catalyst; catalyzing carbohydrazide reduction at the low temperature of 40 to 50 DEG C to remove the dissolved oxygen in the recycled water, wherein the combined modified activated carbon fiber catalyst is a catalyst obtained by carrying out high-pressure hydrothermal modification treatment on activated carbon fibers, immersingand loading an active metal salt precursor and roasting. According to the removal method disclosed by the invention, the reaction temperature of the dissolved oxygen in the carbohydrazide and the recycled water is effectively reduced, and the removal effect of the dissolved oxygen in the recycled water is improved; the removal method is especially suitable for removing the dissolved oxygen in output water of three-grade treatment of a sewage treatment plant.

The invention relates to a fuel cell cathode catalyst and a preparation method thereof, a membrane electrode and a fuel cell. The preparation method of the fuel cell cathode catalyst comprises the following steps: providing or preparing a nitrogen-doped carbon carrier deposited with platinum alloy nanoparticles, wherein the platinum alloy nanoparticles comprise platinum and at least one 3d transition metal; and carrying out acid treatment to consume the 3d transition metal on the surface layer of the platinum alloy nanoparticles, and then, carrying out heat treatment for 1-20 h at the temperature of 100-300 DEG C to obtain the fuel cell cathode catalyst. The fuel cell cathode catalyst prepared by the preparation method has excellent catalytic activity and stability, and is beneficial to industrial application.

The invention discloses a preparation method for a monolithic chromium oxide catalyst. The preparation method comprises the following steps: preparing a monolithic catalyst provided with a chromium oxide coating by adopting an impregnation method: weighing a chrome precursor and dissolving the chrome precursor in deionized water, stirring the solution at normal temperature, pouring the chrome precursor on a cordierite honeycomb ceramic carrier after the chrome precursor is dissolved uniformly, after the cordierite honeycomb ceramic carrier is impregnated repeatedly, drying at 100 DEG C, and roasting for 4 hours at 300 DEG C to obtain the monolithic catalyst provided with the chromium oxide coating; preparing the monolithic chromium oxide catalyst by an alkaline liquid processing method: soaking the monolithic catalyst provided with the chromium oxide coating prepared by the step (1) in an alkaline liquid in an excessive impregnating way, wherein the PH of the alkaline liquid is 8 to 10, soaking the monolithic catalyst provided with the chromium oxide coating, roasting the monolithic catalyst provided with the chromium oxide coating for 2 to 6 hours after being dried for 12 hours, thereby obtaining the alkaline liquid surface processed monolithic chromium oxide catalyst. The catalytic oxidation of a NO reaction at normal temperature is realized; NO can be eliminated at the normal temperature; the engineering application is realized. The catalyst disclosed by the invention has a good application prospect because raw materials are easily available and the process is simple.

The invention discloses a preparation method for a wet oxidation catalyst. The preparation method includes the following steps: (1) processing active carbon by adopting carbohydrate, and performing pulping; (2) dissolving a copper source precursor into a solution; (2) dissolving a cerium source precursor into a solution; (4) mixing materials prepared by the step (1), (2) and (3), adjusting pH values to form deposition, and performing filtering, washing and drying, and roasting in an inert gas environment so that a powder material can be formed; and (5) mixing the powder material of the step (4) with a manganese source precursor solution into slurry, and adding a pore forming agent after stirring, performing seal standing to form the mixture into a clover shape through extruding after secondary stirring, coating nanometer zirconia after drying, and performing roasting in an inert gas environment to form a wet oxidation catalyst. The prepared wet oxidation catalyst can be used for high concentration organic wastewater, and has characteristics of large specific surface areas, strong sulfur tolerance and stable catalytic activity, etc.

The invention discloses a honeycomb denitration catalyst with increased specific surface area and a preparation method. The preparation method comprises steps as follows: (1) beating active alumina; (2) dissolving a titanium source precursor; (3) dissolving a tungsten source precursor and mixing the dissolved tungsten source precursor with the materials in the steps (1) and (2); (4) adjusting pH of the material evenly mixed in the step (3) to 8-13, and performing precipitation, filtering and washing to obtain a filter cake; (5) adding water to the filter cake obtained in the step (4), mixing the filter cake into a slurry state, adding a vanadium source precursor solution, and performing mixing, drying and roasting to form powder; (6) mixing a solution formed by a molybdenum source precursor with the powder in the step (5) into a slurry, stirring the mixture, adding a pore-forming agent, performing secondary stirring, allowing the mixture to stand, squeezing the mixture into a honeycomb shape, performing drying, and coating the surface with nano-tungsten oxide for roasting to obtain the denitration catalyst. The prepared denitration catalyst has the advantages that the specific surface area can be increased, and non-uniform deposition of heavy metals in flue gas on the surface of the catalyst is prevented.

The invention discloses a preparation method of a heavy oil hydrodemetallization catalyst, and the method comprises the following steps: (1) pulverizing a waste hydrotreating catalyst, and roasting; (2) soaking the material obtained in the step (1) into an ammonium bicarbonate aqueous solution, carrying out sealed heat treatment, drying, soaking with a polyethylene glycol solution, and drying to obtain a pretreated material A; (3) performing high-temperature activation treatment on kaolin, then soaking into an ammonium bicarbonate aqueous solution, performing sealed heat treatment, and dryingthe material subjected to heat treatment to obtain a pretreated material B; and (4) kneading and molding pseudo-boehmite, the pretreated material A and the pretreated material B, drying and roasting the molded product to obtain a carrier, and loading a hydrogenation active component onto the carrier to obtain the catalyst. According to the method, the hydrodemetallization catalyst is prepared fromthe waste catalyst and kaolin, environmental pollution is reduced while the production cost is reduced, the content of macropores of the hydrodemetallization catalyst is appropriate, and the hydrodemetallization catalyst has high hydrodemetallization activity and hydrodesulfurization activity.

The invention discloses a preparation method for a high specific surface area wet oxidation catalyst. The preparation method includes the following steps: (1) processing active carbon by adopting carbohydrate, and performing pulping; (2) dissolving a copper source precursor into a solution; (3) mixing materials of (1) and (2), adjusting pH values to form deposition, and performing filtering and washing; (4) dissolving a nickel source precursor into a solution, fulling mixing with (3), performing drying, baking the mixture in an inert gas environment to form a powdered material; and (5) mixingthe powdered material of the step (4) with a cerium source precursor into slurry, adding a pore forming agent after stirring, performing seal standing and drying after secondary stirring, baking the mixture in the inert gas environment to form a wet oxidation catalyst. The prepared wet oxidation catalyst can be used for oil refining or ethylene waste lye treatment, and has large specific surface areas and high catalytic activity.

The invention provides a clean production method of 2,4-di-tert-butylphenol, wherein the clean production method comprises the steps: A) mixing phenol and a catalyst, stirring, heating, adding isobutene, and carrying out a reaction to obtain 2,4-di-tert-butylphenol, wherein the catalyst is a transition metal oxide doped molecular sieve, the transition metal oxide is La2O3 and CeO2, the molecular sieve is an X-type molecular sieve and/or a Y-type molecular sieve, and the mass fraction of the transition metal oxide in the catalyst is 6-20%; and B) mixing the used catalyst with a new catalyst, adding phenol and isobutene, carrying out a reaction again, repeating for several times, extracting and recovering the catalyst by using an organic solvent, and then drying and calcining to finish regeneration and recycling of the catalyst. The molecular sieve catalyst doped with the transition metal is used for alkylation reaction of phenol and isobutene, the catalytic activity is high, byproductsgenerated by reaction of a target product and isobutene molecules can be reduced, and the reaction selectivity is improved.

The invention discloses a preparation method of a demetalization catalyst, and the method comprises the following steps: (1) pulverizing a waste hydrotreating catalyst, and roasting; (2) immersing thematerial obtained in the step (1) into an ammonium bicarbonate aqueous solution, carrying out sealed heat treatment, filtering, drying the material, soaking with a polyethylene glycol solution, filtering, and drying to obtain a pretreated material A; and (3) subjecting pseudo-boehmite and the pretreated material A to kneading molding, drying and roasting the molded product so as to obtain a carrier, and loading a hydrogenation active component onto the carrier so as to obtain the demetalization catalyst. According to the method, the hydrodemetallization catalyst is prepared from the waste catalyst, so that the production cost is reduced, the environmental pollution is reduced, the activity of the catalyst is guaranteed, the catalyst has good stability, and the operation period of a devicecan be prolonged.

The invention discloses a preparation method of a nitrogen-doped graphene material based on 5, 5'-diamino-3, 3'-1, 2, 4-triazole. The method comprises the following steps: dispersing graphene into N,N '-dimethylformamide, adding an N, N'-dimethylformamide solution of 5, 5 '-diamino-3, 3'-1, 2, 4-triazole, heating at 50-100 DEG C for 30-60 minutes, cooling to 0-4 DEG C, and drying to obtain a graphene-coated 5, 5 '-diamino-3, 3'-1, 2, 4-triazole eutectic; grinding 5, 5 '-diamino-3, 3'-1, 2, 4-triazole eutectic into powder, and heating the powder at 500-800 DEG C for 3-5 hours to obtain a nitrogen-doped graphene material; according to the preparation method, the graphene is uniformly coated on the surface of the 5, 5 '-diamino-3, 3'-1, 2, 4-triazole crystal, and additives such as an adhesive are not needed, so that the surface performance of the 5, 5 '-diamino-3, 3'-1, 2, 4-triazole crystal is completely maintained.

The invention discloses a preparation method of a nitrogen-doped graphene material containing 3, 5-diamino-1H-1, 2, 4-triazole. The method comprises the following steps: dispersing graphene in deionized water, adding a 3, 5-diamino-1H-1, 2, 4-triazole ethanol solution into the graphene solution, heating the solution at 50-100 DEG C for 30-60 minutes, cooling the solution to 0-4 DEG C, drying the solution to obtain a graphene-coated 3, 5-diamino-1H-1, 2, 4-triazole eutectic material, grinding the 3, 5-diamino-1H-1, 2, 4-triazole eutectic material into powder, and heating the powder at 500-800 DEG C for 3-5 hours to obtain a nitrogen-doped graphene material. According to the preparation method disclosed by the invention, 3, 5-diamino-1H-1, 2, 4-triazole is utilized to react with graphene, sothat the graphene material with relatively high nitrogen doping content is obtained. According to the material, the graphene uniformly coats the surface of the 3, 5-diamino-1H-1, 2, 4-triazole crystal, and additives such as an adhesive and the like are not needed, so that the surface performance of the 3, 5-diamino-1H-1, 2, 4-triazole crystal is completely maintained.

The invention discloses a denitration catalyst for increasing a specific area and a preparation method. The method comprises the following steps: (1) mixing activated carbon with a sugar solution and pulping; (2) dissolving a titanium source precursor; (3) dissolving a tungsten source precursor and uniformly mixing the tungsten source precursor with the materials acquired in the steps (1) and (2); (4) uniformly mixing the material acquired in the step (3) and then adjusting the pH value of the solution to 8-13, precipitating, filtering and washing, thereby acquiring a filter cake; (5) adding water into the filter cake acquired in the step (4), preparing into pulp, adding a vanadium source precursor solution, mixing, drying and roasting under inert gas shielding, thereby forming powder; and (6) mixing the solution formed by a silicon source precursor with the powder acquired in the step (5) and forming slurry, adding a pore former, stirring for two times and then standing, drying and roasting under inert gas shielding, thereby acquiring the denitration catalyst. The product disclosed by the invention can increase the specific area of the catalyst and can reduce the conversion rate of SO2/SO3.