82results about How to "Increase intrinsic activity" patented technology

The invention provides a hydrogenation catalyst and a preparation method thereof. The preparation method uses metal active components of group VIB and VIII for step load, wherein metal of group VIB is molybdenum, metal of group VIII is cobalt or nickel, and a carrier is porous oxide. Load of group VIB metal uses a corresponding soluble salt as a raw material, inorganic acid is used as an acidifying agent, and a long-chain alkyl quaternary ammonium cation is used as a precipitating agent; and Mo-based single-component loaded catalyst is prepared by firstly synthesizing an organic-inorganic hybrid material suspension, performing aqueous phase diffusion and tunnel deposition, filtering, washing, drying, and roasting. Load of group VIII metal uses a corresponding soluble salt as a raw material, and the metal is loaded onto the carried through a normal-temperature isopyknic dipping technology. The method can effectively improve load capacity of the active components and dispersiveness of the active components in the tunnels; and the prepared hydrotreating catalysts is excellent in hydrodesulfurization activity.

The present invention relates to novel coagulation factor FVIIa polypeptides.

The present invention relates to the treatment of dopamine-related dysfunction using full D₁ dopamine receptor agonists in an intermittent dosing protocol with a short, but essential, “off-period.” The D₁ agonist concentration is reduced during the “off-period” to obtain a plasma concentration of agonist that suboptimally activates D₁ dopamine receptors for a period of time to prevent induction of tolerance. Specifically, the method comprises the steps of periodically administering to a patient a full D₁ agonist with a half-life of up to about 6 hours at a dose resulting in a first plasma concentration of agonist capable of activating D₁ dopamine receptors to produce a therapeutic effect. The dose is reduced at least once every 24 hours to obtain a second lower plasma concentration of agonist that results in suboptimal activation of D₁ dopamine receptors for a period of time sufficient to prevent induction of tolerance.

The invention discloses a concrete expanding agent. The concrete expanding agent is prepared from, by weight, 10-15 parts of calcium silicoaluminate, 20-30 parts of calcium sulphoaluminate, 5-9 parts of ferric sulfate, 20-25 parts of sulfur-fixing waste residues, 15-20 parts of red mud, 6-8 parts of modified calcium oxide, 4-6 parts of magnesium oxide, 4-8 parts of sodium methyl silicate, 3-5 parts of triethanolamine, 0.1-0.3 part of azodicarbonamide, 0.5-0.7 part of sodium gluconate, 2-4 parts of sodium laurylsulfate, 0.4-0.6 part of polyethylene glycol, 1-3 parts of polycarboxylate superplasticizer, 2-6 parts of modified pyrophillite powder and 1-3 parts of nano calcium carbonate. The concrete expanding agent has the advantages of being high in strength, good in compensation capability, capable of regulating and controlling a calcium oxide reaction and the like and is a concrete additive having the development prospect.

The invention discloses a metal boride water-splitting catalyst, a preparation method and an application of the catalyst in electro-catalytic water splitting and belongs to the technical field of preparation of an electrocatalyst. The metal boride water-splitting catalyst is prepared with a solid-phase boriding method, transition metal is coated with a solid boriding agent, and boriding treatmentis performed through temperature programming heating. The boriding agent is prepared from a necessary boriding medium and an unnecessary filling agent. Compared with liquid boriding, a solid boridingmethod has the advantages that the surface clearing difficulty is low after boriding, requirements for equipment are low, and the method is applicable to boriding treatment of various transition metals. The catalyst has very good intrinsic catalysis activity and stability performance under the alkaline condition, and the required potential is 300-400 mV when the current density is 10 mA cm<-2>; the electro-catalytic water splitting oxygen evolution stability can be as long as at least 100 h while the performance is not attenuated, and the catalyst can replace noble metals to promote commercialapplication of electro-catalytic water splitting.

The invention discloses a core shell carbon nano-structure electrocatalyst with high catalytic performance and a preparation method thereof. Phthalocyanine iron having an enclosed edge structure is used as a shell, a conductive carbon is used as a core, and an Fe-N4 central structure of iron phthalocyanine unit is used as an active site. The preparation method comprises the following steps: 1), adding the conductive carbon into a mixed solution of pyromellitic dianhydride and phthalic anhydride, and performing drying to obtain powder A; 2), uniformly mixing the powder A with an iron compound,ammonium molybdate and urea to obtain powder B, heating to ensure that the powder B is a fused solution, performing microwave reaction to ensure that in-site polymerization reaction is carried out, and performing washing and drying to obtain the core shell carbon nano-structure electrocatalyst with the high catalytic performance. Being obviously superior to commercial Pt/C catalyst, the novel core shell carbon catalyst disclosed by the invention has excellent high oxygen reduction catalytic activity, excellent circulation stability and excellent CH3OH/CO tolerance; the raw materials used by synthesis of the catalyst are market developed products and are low in cost; the preparation process is simple and feasible, and is suitable for commercial mass production.

The invention belongs to the technical field of oxygen reduction electrocatalyst preparation, and particularly relates to a modified carbon nitride loaded noble metal-based electrocatalyst and a preparation method and application thereof, the electrocatalyst is an oxygen reduction reaction electrocatalyst, heteroatom doped protonation modified carbon nitride is used as a substrate, and noble metal nanoparticles or clusters are loaded. The noble metal nanoparticles of the electrocatalyst are uniformly and stably distributed on the carbon carrier, and the bonding strength of the noble metal nanoparticles and the carbon carrier is greatly improved, so that the noble metal nanoparticles can effectively keep the structure stable in the electrochemical reaction process of a cathode; and the modified carbon nitride is beneficial to avoiding the reduction of the electrocatalytic activity due to the structural change of the active catalyst, and the performance of the fuel cell is greatly improved due to the relatively high electrocatalytic activity.

The invention discloses a preparation method of a metal-doped bismuth layered oxide. The method comprises the steps of soaking a conductive substrate in a bismuth precursor solution and drying to obtain a conductive substrate modified with a bismuth oxide seed layer; and soaking the conductive substrate modified with the bismuth oxide seed layer in a bismuth precursor solution containing heteroatoms, and and synthesizing the metal-doped bismuth layered oxide with a nanosheet array structure on the conductive substrate through a hydrothermal method. The invention also discloses application of the metal-doped bismuth layered oxide in electrocatalytic reduction of CO2. The metal-doped bismuth layered oxide prepared by the invention is more stable in structure and performance, has a honeycomb nanosheet array structure, can provide a large electrochemical active area, and can promote enrichment and reduction of CO2 on the surface of an electrode and improve the current density when being used as a cathode catalyst in a reaction of electrocatalytic reduction of CO2.

The invention belongs to the field of electrocatalysts, and discloses a preparation method and application of a ruthenium-doped cobalt phosphide electrocatalyst for producing hydrogen by high-performance electrochemical decomposition of water. The method comprises the following steps: synthesizing a Co-MOF precursor with an open skeleton through a simple aging reaction, and further forming a RuCo-MOF catalyst with a mesoporous nanostructure through ion etching; and finally, carrying out low-temperature phosphating reaction to obtain the Ru-CoP hollow porous nanocube electrocatalyst. The series of metal-doped phosphides have relatively low charge transfer resistance and reaction potential barrier of hydrogen evolution reaction, and have excellent performance in electro-catalytic hydrogen evolution reaction. Meanwhile, the catalyst is low in cost, simple and convenient to operate, simple in process and excellent in catalytic performance, and provides basic application research for the material in the field of electrocatalysis.

The invention relates to a preparation method of a Mo-SBA-15 molecular sieve. The compounding steps include adding a mesoporous material SBA-15, which is self-assembled in a strong-acid system but not subjected to hydro-thermal treatment, into a solution containing a VIB-family metal precursor, adjusting the reaction system pH value to 0-2, and subjecting the solution to high-temperature hydrothermal crystallization to obtain a sample, namely the SBA-15 molecular sieve containing VIB metal. The obtained Mo-SBA-15 molecular sieve has the advantages of high loading capacity, high dispersity and highly-ordered mesopores. By taking the Mo-SBA-15 molecular sieve as a carrier, a catalyst with high large specific surface area, excellent reactive metal dispersity, high acidity and excellent hydrodesulphurization performance can be obtained only via a VIII-family metal impregnation process.

The invention discloses a hydrotreating catalyst and a preparation method and application thereof. The preparation method of the hydrotreating catalyst comprises the steps that (1), an alumina carrieris prepared or selected; (2) the alumina carrier prepared or selected in step (1) is dipped with a nitrogenous organic acid solution or an aromatic carboxylic acid solution; (3) the alumina carrier dipped with a pyridinedicarboxylic acid solution or the aromatic carboxylic acid solution in step (2) is subjected to low temperature drying treatment; and (4) the alumina carrier subjected to low temperature drying treatment in step (3) is dipped with an active component solution or active metal and an assistant, high temperature thermal treatment is conducted after dipping, and the hydrotreatingcatalyst is prepared. The catalyst prepared by adopting the method is high in metal component dispersity and sulfidity, and is liable to be sufficiently vulcanized, the number of generated active sites is large, improvement of the activity of the catalyst is facilitated, meanwhile, the preparation method is simple, and the production cost is low.

The invention belongs to the field of irreversible hydrogen storage materials, and discloses a fine regulation supported alloy catalyst and a preparation method and application thereof. The catalyst comprises a metal alloy active phase and a metal oxide matrix phase, wherein the metal alloy active phase is highly dispersed on the surface of the metal oxide matrix phase in the form of ultra-small nanoparticles. The preparation method comprises the following steps: adjusting the pH values of solutions of different precious metal precursor salts according to needs, adsorbing a single layer of theprecious metal precursor salts on a solid solution substrate, and carrying out a heat treatment reaction on the obtained product in a reducing atmosphere to obtain the high-dispersion nano-alloy catalyst. The preparation method has the advantages of easily available raw materials, simple process and easiness in mass production. The prepared catalyst has high intrinsic catalytic activity, rich active sites and excellent stability, and can efficiently catalyze hydrazine hydrate to decompose to produce hydrogen under alkaline conditions.

The invention relates to a preparation method of mesoporous nitrogen-doped graphene-loaded molybdenum disulfide synthesized by laser irradiation and application of the mesoporous nitrogen-doped graphene-loaded molybdenum disulfide in electrocatalytic hydrogen production. In order to solve the problems that by an existing synthesis process, transition metal oxide/sulfide composite mesoporous nitrogen-doped graphene rich in carbon-pyridine nitrogen metal bonds cannot be synthesized at low temperature and under low pressure, and the content of the carbon-pyridine nitrogen metal bonds in the composite system cannot be regulated and controlled effectively, it is found that the content of the carbon-pyridine nitrogen-molybdenum bonds in the composite catalyst can be improved by irradiating graphene oxide with laser in a range of 177-315 mJ, and in a hydrothermal process, the mass ratio of laser irradiation graphene oxide to tetrathiomolybdic acid as raw materials is 1: 1-1: 8, the loading amount of the molybdenum disulfide on mesoporous graphene can be optimized, thus, while the conductivity of the molybdenum disulfide is improved, the intrinsic activity of the molybdenum disulfide can also be improved synergistically by the carbon-pyridine nitrogen molybdenum bonds at an interface, and the electrocatalysis process of HER is promoted. The preparation method is simple in process, ingenious in design and low in cost, and is safe and environmentally friendly.

The invention discloses a hydrocracking pretreatment method for high-nitrogen high-dry-point raw oil. The method comprises the following steps: (1) under hydrofining process conditions, high-nitrogenhigh-dry-point raw oil and hydrogen are mixed and enter a hydrofining reactor for a hydrofining reaction, the hydrofining reactor at least comprises two hydrofining catalyst beds, the upper portion ofeach hydrofining catalyst bed is filled with a hydrofining catalyst A, and the lower portion of each hydrofining catalyst bed is filled with a hydrofining catalyst B; (2) a hydrogenation reaction effluent obtained in the step (1) enters a hydrocracking reactor for a hydrocracking reaction, and the hydrocracking reactor is filled with a hydrocracking catalyst; and (3) a hydrocracking reaction effluent obtained in the step (2) enters a separation system to be separated to obtain one or more of gas, naphtha, aviation kerosene and diesel and tail oil.

The invention belongs to the technical field of lithium-sulfur batteries, and particularly relates to a preparation method of a layered double hydroxide composite material for a positive electrode of a lithium-sulfur battery. The preparation method of the layered double hydroxide composite material for the positive electrode of the lithium-sulfur battery comprises the following steps: (1) synthesizing AC-FeCoNi; and (2) synthesizing Cu SAs/AC-FeCoNi. Copper atoms are introduced into AC-FeCoNi through an in-situ cation exchange reaction to prepare the Cu SAs/AC-FeCoNi composite material, and the preparation method is simple, effective and easy to operate; and the prepared composite material has high conductivity and high specific surface area, and has a stable three-dimensional structure.

The invention belongs to the field of electrocatalytic materials, and discloses a synergistically modified composite electrocatalyst and an application thereof in ethanol oxidation. The composite electrocatalyst is composed of an active noble metal phase and a basic carbonate matrix phase, wherein the active noble metal phase is dispersed and distributed on the surface of the basic carbonate matrix phase with a nanowire structure in the form of fine nanoparticles. The synergistic modified composite electrocatalyst provided by the invention optimizes intrinsic activity, the number of active sites and electrical conductivity at the same time. Based on synthesis of the matrix phase with a nanowire structure, the noble metal oxide phase is deposited on the surface of a nanowire through hydrolysis, and finally, the active metal phase is selectively reduced by regulating and controlling the heat treatment condition, so that the active metal phase is combined with the basic carbonate matrix to construct synergistic catalytic active sites, and the obtained composite electrocatalyst has high intrinsic activity, rich active sites and good electrical conductivity. And the electrochemical oxidation reaction of ethanol can be efficiently and stably catalyzed under an alkaline condition.

The invention belongs to the fuel cell material field, and discloses a non-noble metal hydrazine oxidation catalyst based on collaborative modification and a preparation method thereof. The catalyst comprises metal nitride active phases and metal matrix phases, wherein the metal nitride active phases are dispersed and distributed on surfaces of the metal matrix phases in a fine nanoparticle form.A carrier material is added into an aqueous solution containing transition metal salt and a precipitator, hydrothermal reaction at 80-180 DEG C is performed to obtain a nano-structure catalyst precursor, and heat treatment reaction is performed in a mixed atmosphere of an ammonia gas and an inert gas at 300-450 DEG C to obtain the non-noble metal hydrazine oxidation catalyst based on the collaborative modification. The preparation method is low in raw material cost, convenient to prepare and easy for mass production. The prepared catalyst has high intrinsic catalytic activity, rich active sites and good conductivity, and can efficiently and stably catalyze an electrochemical oxidation reaction of hydrazine under an alkaline condition.

The invention relates to a preparation method of an electrocatalyst, in particular to a preparation method of an electrocatalyst with multiple defects and active sites, and aims to solve the problemsof expensive noble metal catalysis price, rare reserves, low electrocatalytic efficiency in electrocatalytic decomposition of water, poor stability after long-time use and complex preparation of electrodes by using a powder type electrocatalyst in the field of hydrogen production by water electrolysis. The method comprises the following steps: 1, stirring and dissolving metal salt, ammonium fluoride and urea in deionized water to obtain a mixed solution; 2, dipping a conductive substrate in the mixed solution, and carrying out a heat preservation reaction to obtain the conductive substrate onwhich a precursor grows; and 3, putting a reaction source and the conductive substrate on which the precursor grows into a chemical vapor deposition device to react, thereby completing the preparationmethod of the electrocatalyst with multiple defects and active sites.

The invention relates to the field of hydrotreating catalysts, and discloses a hydrotreating catalyst, a preparation method and applications thereof. The preparation method comprises: 1) impregnatingan alumina carrier with a sulfur-nitrogen-containing organic compound solution to obtain an impregnated product; 2) carrying out low-temperature drying treatment on the impregnated product obtained inthe step 1); and 3) impregnating the alumina carrier treated in the step 2) with an active component solution, and carrying out heat treatment, wherein the temperature of the low-temperature drying treatment is 15-180 DEG C, and the temperature of the heat treatment is 180-550 DEG C. According to the present invention, the catalyst prepared by the method has good matching between the dispersion degree and the sulfurization, and more active sites are generated, such that the intrinsic activity of the catalyst is easily improved; and the preparation method is simple, and the production cost islow.

The invention aims to improve the performance of a hydrodesulfurization catalyst and provides a preparation method of the hydrodesulfurization catalyst, which belongs to the field of fuel oil hydrodesulfurization. The preparation method comprises the following steps of 1) carrying out surface modification on a carbon-based material, and 2) preparing a precursor solution containing NiMo, CoMo or NiMo active components, loading the active components in the precursor solution on the surface of the surface-modified carbon-based material, drying, and calcining to obtain the carbon-based hydrodesulfurization catalyst containing the active components. The surface of the carbon material is modified; on the basis of not destroying the pore structure of the carbon material, the interaction between the metal active component and the carbon material is adjusted to obtain NiMo, CoMo and NiMo secondary active centers, so that the metal can be anchored on the surface of the carrier and can be deeplyvulcanized, and the hydrodesulfurization reaction performance of the sulfur-containing component and distillate oil can be obviously improved.

The invention relates to a preparation method of ruthenium@ruthenium dioxide core-shell nanospheres containing tensile strain for an acidic oxygen production electrocatalyst. Ruthenium dioxide powderis placed in ultrapure water to be subjected to ultrasonic dispersion to obtain turbid liquid without sediment; the turbid liquid is continuously stirred at room temperature, and the turbid liquid isirradiated by using nanosecond parallel pulse laser to obtain a black solution; the black solution is placed in a refrigerator to be frozen into a solid, then the frozen solid is placed in a freeze dryer to be freeze-dried, and the ruthenium@ruthenium dioxide core-shell nanospheres containing strain are obtained. According to the prepared sample, the overpotential at 10 mA cm <-2 > is only 191 mVand is reduced by 100 mV or above compared with commercial ruthenium dioxide, and the ruthenium@ruthenium dioxide core-shell nanospheres are a ruthenium-based catalyst which is optimal in performanceat present and does not introduce other atoms. The preparation method is simple in process, convenient to operate and easy to control, and a useful way is provided for designing and synthesizing an efficient electrocatalyst.

The invention aims to provide a preparation method of a chromium-doped cobalt phosphide nanorod array growing on carbon cloth in situ, which comprises the following specific steps of oxidizing the carbon cloth in nitric acid to enhance the hydrophilicity of the carbon cloth, and growing a layer of precursor CrxCo1-x(OH)F/CC on the carbon cloth in situ by a hydrothermal method, finally, converting the precursor growing on the carbon cloth into chromium-doped cobalt phosphide CrxCo1-x(OH)F/CC through a high-temperature gas-phase phosphating method. The preparation process is simple to operate, easy to control and low in cost and can be used for large-scale production, the chromium-doped cobalt phosphide nanorod array which grows on the carbon cloth in situ and is prepared by adopting the method is uniform in distribution and close in arrangement, the rod-like particle size reaches the nanoscale and is uniform in particle size, and the CoP crystal form is reserved while the free energy of hydrogen adsorption is reduced by chromium doping; the hydrogen evolution reaction can be efficiently, continuously and stably catalyzed.