101results about How to "Increase dispersion" patented technology

The invention discloses a preparation method of a low-load-capacity and high-activity load type ruthenium catalyst using titanium dioxide as a carrier. According to the invention, the titanium dioxide is used as the carrier, an ageing solution is illuminated by using ultraviolet rays in a precipitation and deposition ageing process, thus interaction of a ruthenium precursor and the titanium dioxide is enhanced, the dispersion degree of the precursor is improved, and further the high-dispersion titanium dioxide loaded ruthenium catalyst is obtained. The preparation method has the advantages of simple equipment and process, high yield, and convenience for industrialized production; and the prepared ruthenium catalyst has the advantages of small ruthenium granularity and good reproducibility. The ruthenium catalyst is applied to a process for synthesizing methane by carbon dioxide through hydrogenation, and has high reactant transformation rate, high selectivity and good stability.

The invention discloses a molybdenum-based low-temperature denitration catalyst and a preparation thereof. The catalyst is characterized in that TiO2 is used as a carrier, the oxides of molybdenum are used as active components, one or more of the oxides of metals V, W, Cu, Ni, Zn and Ce are added as auxiliaries, and the active components in the prepared catalyst occupiy 1-15% of the catalyst. The preparation method of the catalyst comprises the steps of ultrasonic mixing, drying, crushing and roasting. By using ammonia as a reducing agent, the denitration efficiency can be up to 80% when the temperature is 130 DEG C and the temperature of an active window is 150-446 DEG C when the catalyst is up to 99%; and during the preparation, drying and roasting are carried out, then the specific surface area and the stability of the catalyst are improved and the service life of the catalyst is prolonged, so that the catalyst has good industrial application prospect. The catalyst is suitable for the smoke low-temperature denitration catalytic processes.

The invention relates to a sulfur and mercury removing agent, which consists of a carrier and active ingredients, wherein the carrier can be a single carrier or is formed by two or more kinds of carriers; the carrier accounts for 10 to 80 percent of the total weight of the sulfur and mercury removing agent; and the active ingredients include 0.1 to 40 weight percent of manganese dioxide MnO2 and 0.1 to 60 weight percent of magnetic iron oxide Fe21.333O32. The invention also discloses a method for preparing the sulfur and mercury removing agent. The sulfur and mercury removing agent prepared by the method has high sulfur capacity and high mercury capacity, has a sulfur and mercury removal efficiency of over 99 percent and can be widely used in sulfur and mercury removing treatment devices for flue gases of coal burning power plants and light dydrocarbons of oil refining and chemical plants.

In the invention, a catalyst used for hydrogenation reaction of pyromellitic acid ester to prepare hydrogenated pyromellitic acid ester is prepared, the catalyst is prepared by loading multi-component noble metal on a rare-earth modified and compounded aluminum oxide carrier, and the hydrogenation catalyst has high activity, high selectivity and long life.

The invention provides a catalyst for propylene production using propane dehydrogenation, a preparation method thereof and application of the catalyst to the field of propylene production using propane dehydrogenation.The catalyst is characterized in that the catalyst uses regular mesoporous alumina-zirconia or alumina-cerium oxide composite oxide as the carrier, chromium oxide as the active component and alkali metal oxide as the auxiliary; by the weight of alumina, the content of zirconia or cerium oxide is 2-10%; the loading amount of the chromium oxide is 5-15%, and the loading amount of the alkali metal oxide is 0.05-0.5%.The catalyst is high in propane conversion rate and propylene selectivity, can inhibit carbon deposition and is good in high-temperature stability.

The carbon nanotube powder prepared by the invention has hydrophilic and lipophilic properties and can be dispersed in water and organic solvents. First, surface active agent is used to disperse carbon nanotubes in water to form a uniform and stable dispersion liquid; then, the carbon nanotube dispersion liquid is freeze-dried to obtain dispersed and fluffy carbon nanotube powders. The operation method of the present invention is simple and practical, and is easy to operate. The carbon nanotube powder prepared by the present invention can be well dispersed in water and organic solvents (such as NMP, DMF, ethanol, etc.) under stirring, ultrasonic action or a combination thereof, Large dispersion, fast dispersion speed and uniform dispersion system significantly improve the dispersion performance of carbon nanotubes, which creates conditions for the real application of carbon nanotubes in composite materials, electrode materials, nano devices and other fields.

The invention discloses a selective hydrogenation catalyst of cracked gasoline and a preparation method of the selective hydrogenation catalyst. The catalyst comprises a carrier and an active component which is loaded on the carrier; the active component is obtained by ionizing radiation reduction; the active component comprises a main active component (palladium) and an auxiliary active component; the content of the palladium is 0.01 to 1.0 weight percent of the total weight of the carrier; the auxiliary active component is one or more of stannum (Sn), lead (Pb), copper (Cu), gallium (Ga), zinc (Zn), silver (Ag), antimony (Sb), manganese (Mn), cobalt (Co), molybdenum (Mo) and tungsten (W); and the content of the auxiliary active component is 0 to 3.0 weight percent of the total weight of the carrier. A metal active component precursor or oxide which is obtained by roasting the metal active component precursor is subjected to the ionizing radiation reduction to obtain the selective hydrogenation catalyst of the cracked gasoline, wherein the metal active component is loaded on the carrier of the catalyst. The catalyst prepared by the method improves the utilization rate of the main active component (palladium), so that the hydrogenation activity and selectivity of the catalyst are obviously improved.

The invention discloses a cycloalkane dehydrogenation catalyst, a preparation method thereof and an application. The preparation method includes steps of preparing a catalyst carrier Ce-Mg-Al or Zr-Mg-Al hydrotalcite by an alkali coprecipitation method; after drying the carrier, directly applying the carrier to immerse the load active component Pt or Pd or Ru; then drying, roasting and performing hydrogen reduction; acquiring the composite oxide dehydrogenation catalyst. The catalyst is applied to the cycloalkane dehydrogenation reaction, and can present excellent catalytic reaction activity and hydrogen producing rate under relatively gentle reaction condition; moreover, the preparation method is simple and has good industrial application prospect.

The invention relates to a preparation method for a desulfurizing agent, which comprises the following steps: a) mixing nanometer-sized zinc oxide, a caking agent and a pore creating material to obtain a mixed material; b) dissolving soluble cupric salt into water to form a solution, and loading the soluble cupric salt on the mixed material by an immersion method to obtain the mixed material containing copper element; c) pinching the mixed material containing the copper element and forming the material to obtain a formed object; and d) drying and baking the formed object to obtain a finished desulfurizing agent. The desulfurizing agent obtained by the preparation method has high dispersion degree in active components; therefore, the finished product not only has high sulfur capacity, but also can achieve the aim of high accuracy desulfurization.

The invention discloses a preparation method of a titanium dioxide nanosheet-diatomite composite photocatalyst. The method comprises the following steps: pretreatment: putting diatomite into a container, adding deionized water and concentrated hydrochloric acid, carrying out reflux reaction for 5 hours under magnetic stirring, carrying out vacuum filtration, respectively washing with deionized water and anhydrous ethanol three times until no chlorine ion exists, and carrying out vacuum drying at 100 DEG C to obtain pretreated diatomite; and preparation of photocatalyst: dispersing the pretreated diatomite in anhydrous ethanol, adding titanium tetraisopropylate, transferring into a teflon-lined hydrothermal reaction kettle, dropwisely adding hydrofluoric acid into the reactor, sealing the teflon-lined hydrothermal reaction kettle, keeping the temperature at 160-220 DEG C for 24-50 hours, filtering the reaction product, washing and drying to obtain the titanium dioxide nanosheet-diatomite composite photocatalyst. The complementation of the advantages of high dispersity and pearly luster of composite photocatalyst is achieved, and the formaldehyde degradation efficiency can be effectively enhanced.

The invention relates to a reforming catalyst with high dispersion stability and a preparation method thereof and belongs to the technical field of reforming catalysts. The catalyst has a multistage structure constructed by alumina and hydrotalcite, assistant metal is introduced into a hydrotalcite laminate by using the characteristic that metal cations of the hydrotalcite laminate are adjustable, and the stability of the assistant metal is improved due to the crystal lattice confinement effect of the hydrotalcite laminate; due to interaction of Pt with the stable assistant metal, high dispersion stability is achieved. The reforming catalyst with the high dispersion stability and the preparation method thereof have the advantages that the dispersion stability of the assistant metal and Pt is high; the reusability of the catalyst is good; in addition, the reforming catalyst has the multistage structure, so that industrial application is facilitated.

The invention relates to a method for using ultra-sonic-plasma to prepare CuO/CeO2/ gamma-Al2O catalyst, wherein said method comprises: (1) adding gamma-Al2O3 particles into the mixture solution of Cu (NO3)2 and Ce (NO3)3, and using ultra-sonic to accelerate the immersion; then using ultra-sonic to radiate at power as 40-1000W, to be fitlerd and dried to obtain the solid particles; (2) plasma processing the solid particles, to obtain the CuO/CeO2/ gamma-Al2O3 catalyst. The inventive catalyst has large specific surface, high disperse degree, while CuO is changed from crystal to high-disperse non-crystal at the surface of catalyst, and the catalyst has high activity, to catalyze and burn the VOCs at low temperature; and the inventive method can avoid expensive metal, with low cost.

The invention relates to a carbon-supported transition metal phosphide electrocatalyst for hydrogen generation and a preparation method of the electrocatalyst. A carbon-supported metal precursor is prepared through in-situ growth by using a transition metal-catalyzed carbon material, then phosphorization is conducted on the metal precursor so as to obtain the carbon-supported transition metal phosphide electrocatalyst for hydrogen generation. In the electrochemical hydrogen generation reaction, only overpotentials of 49 and 130 mV are required by the prepared carbon-supported iron phosphide (FeP/Fe@NC) when the current density is 10 and 100 mA/cm<2>, and meanwhile the catalyst has excellent stability without deactivation for 90 hours or above at a current density of 10 mA/cm<2>. The preparation method is simple and easy, the required raw materials are cheap and easily available, and high binding between the catalyst and the carbon carrier and excellent dispersibility of the catalyst can be ensured, so that the catalyst has good conductivity and electron transport characteristics.

The invention provides a liquefied gas hydrogenating, olefin content decreasing and desulfurizing catalyst and a preparation method thereof. The catalyst comprises a carrier and activated substances, the carrier adopts F-modified Al2O3-TiO2 composite oxides, activated substances comprise molybdenum, nickel and cobalt, the molybdenum is a main component, and the nickel and the cobalt are auxiliary components. The preparation method of the catalyst comprises a process for preparing a modified Al2O3-TiO2 compound oxide carrier and a process for preparing the liquefied gas hydrogenating, olefin content decreasing and desulfurizing catalyst by a co-impregnation method. The liquefied gas hydrogenating, olefin content decreasing and desulfurizing catalyst has the advantages of double functions of resisting to sulfur-poisoning and hydrogenating, olefin content decreasing and desulfurizing of a traditional molybdenum catalyst, simultaneously, low-temperature and low-pressure activity is good, deeply hydrogenating saturability is high, and activity is stable.

The invention provides a cheap low-temperature SCR catalyst with sulfur resistance and a preparation method thereof, and belongs to the field of atmosphere pollution prevention NH3-SCR denitration. The catalyst adopts gamma-Al2O3 as a carrier, manganese oxide as an active ingredient and cerium oxide as a modification agent, and the molar ratio of Ce to Mn to Al is (0.02-0.20): 0.4: 1. When in preparation, NH3.H2O is adopted as a precipitating agent to precipitate the carrier precursor Al(NO3)3 to Al(OH)3, dried Al(OH)3 is soaked in a nitric acid solution of the active ingredient, and then Al(OH)3 is dried and calcined to obtain the SCR catalyst. The catalyst is excellent in low-temperature catalytic activity and capacity for resisting toxicity of SO2 and H2O, and the activity is 100 percent under the reaction condition of 120 to 240 DEG C; after 100ppm of SO2 and 3 percent of H2O are added, the activity can be maintained stable for a long time; after SO2 and H2O are cut off, the activity can be completely restored.

The invention discloses a preparation method of a hydrogenation refining catalyst. The method comprises the following steps: (1) performing high-temperature calcination on original clay, enabling the calcinated clay to react with mixed acid, and pulping so as to form a serous fluid, wherein the mixed acid is the mixture of strong acid and weak acid; (2) adding a Y-shaped molecular sieve into the serous fluid obtained in the step (1), uniformly stirring, adding an acid solution containing aluminum and an alkaline solution in a concurrent flow manner to carry out a gelatinizing reaction, and aging, filtering, washing and drying, so as to obtain alumina powder containing silicon; (3) adding an adhesive into the alumina powder containing silicon, which is prepared in the step (2), and performing extrusion molding, drying and calcination, so as to obtain an alumina carrier containing silicon; (4) preparing a nickel-tungsten active-component solution which contains grease and an organic acid, adding the carrier prepared in the step (3) into the nickel-tungsten active-component solution to dip, and drying and calcinating, so as to obtain the hydrogenation catalyst. Appropriate bonding force is generated between the catalyst carrier and active components, and the degree of dispersion of the active components is moderate. The catalyst is applied in a paraffin hydrorefining reaction, and has the advantages of high stability, high quality of paraffin hydrorefining products, and the like.

The invention discloses an o-phenylphenol catalyst prepared by dehydrogenating cyclohexanone dimer, and a preparation method thereof. A carrier of the catalyst is alumina modified with rare earth oxide, and the catalyst consists of alkali oxide and precious metal which are loaded on the carrier. The invention has the most remarkable characteristic of using the alumina modified with rare earth oxide as the carrier, and another remarkable characteristic of the invention is the preparation method of the catalyst, and the method adopts an isopyknic fractional-step impregnation process, avoids competitive adsorption among components, increases the bonding strength between the components and the carrier, and the like. The catalyst has the advantages of high selectivity to o-phenylphenol, few byproducts, simple preparation process, good stability and capability of simple activation and regeneration after coking deactivation, and is an excellent high-selectivity catalyst with industrial practical value.

The invention discloses a catalyst for preparing C2-oxygenates through hydrogenation of carbon monoxide as well as a preparation method and an application thereof. The catalyst takes monodisperse SiO2 as a carrier and is prepared by a dipping method. The composition of the catalyst is as follows: Rh-Mn-Li/SiO2, wherein the mass ratio of the metals to the monodisperse SiO2 carrier is as follows: Rh: Mn: Li: SiO2 is (0.1-5): (0.02-5): (0.02-5): 100. The preparation method comprises the following steps of: preparing a monodisperse carrier SiO2, roasting the carrier at the temperature of 200-700 DEG C, and dipping the carrier through nitrate or chloride of metallic components, drying for 1-20 hours at the temperature of 30-200DEG C, thus obtaining the catalyst for preparing C2-oxygenates through hydrogenation of carbon monoxide. The catalyst for preparing C2-oxygenates through hydrogenation of carbon monoxide has the advantages of high conversion rate of carbon monoxide and good selectivity of C2-oxygenates.

The invention discloses a preparation method of 1,1,2,3,3-pentamethylindane. The method comprises the following steps: alpha-methylstyrene and2-methyl-2-butene undergo a cycloaddition reaction under the action of a novel supported porous metal-organic Pd catalyst, and the reaction product is continuously rectified to separate the product, wherein the catalyst is represented by Pd-X-Y-Z, X is selected from Cu, Co, Fe, Zn, Ni, W, Re, Ag and Cd, Y is selected from bipyridine, porphyrin, phenanthroline, Schiff bases, triazines and benzonitrile, Z is selected from carbon nanotubes, molecular sieves, neutral alumina, ordered mesoporous carbon and silica, the mass fraction of Pd is 5-20%, X is 20-40%, Y is 30-50%, and Z is 15-45%. The method using the catalyst makes the conversion rate greater than 90% and the selectivity greater than 80%, and the catalyst is stable and is not prone to lose during the cycloaddition reaction. The method of the invention has the advantages of simplicity in operation, and good economic benefits.

The invention provides a preparation method for a small-size high-dispersion fuel battery catalyst and belongs to the technical field of fuel batteries. The preparation method comprises the following steps of: preparing NiFe/C nano particles by a colloidal method, then adding a platinum precursor, dissolving and releasing a large number of electrons through a cathode with the NiFe nano particles to make the whole carbon carrier be a giant reducer for quickly reducing platinum ions adsorbed to the surface of the carbon carrier, and forming the small-size and high-dispersion Pt/C catalyst. The method is simple, feasible and low in production cost; the catalyst prepared by the method can be applied to the fuel battery taking a proton exchange membrane as an electrolyte. The fuel battery manufactured by the method can be widely applied to electric automobiles, various aircrafts and portable electronic equipment such as cameras, notebook computers and electric toys.

The invention relates to a preparation method and an application of a copper and ferrous magnetic metal oxide modified fly ash phosphorus adsorbent. The method is characterized in that: a ferrous sulfate solution and a copper sulfate solution are well mixed; the mixture is heated to a temperature of 40 to 100 DEG C; fly ash is added to the mixture, wherein a proportion of ferrous sulfate to copper sulfate to fly ash is 200-500ml:100ml:1-150g. NaOH is added to the mixture until a pH value of the mixture is 6 to 14; air is delivered into the mixture for 5 to 120min such that magnetism is generated; the mixture is aged for 5 to 120min; precipitate is filtered from the mixture, and is washed by using distilled water; the precipitate is dried and ground, such that the modified fly ash phosphorus adsorbent is obtained. The invention is innovative in that: magnetic metal oxide is loaded on the surface of fly ash, such that the purification effect of fly ash upon phosphorus can be improved; dispersibility of the magnetic metal oxide is improved, such that the magnetic metal oxide has higher absorption efficiency; also, the absorbent used for absorbing phosphorous can easily be separated from water through a magnetic separation method, such that solid-liquid separation efficiency is improved.

The invention relates to a preparation method for a methanol synthesizing catalyst and belongs to the technical field of catalyst preparation. The preparation method comprises the steps of: first, preparing a mixed solution of zinc nitrate and aluminum nitrate and an alkaline precipitator solution, adding the alkaline precipitator solution into the mixed solution till the pH is 7, and then washing, drying and roasting the mixed solution to obtain a ZnO-Al2O3 carrier; then preparing an ammonia water solution and a reducing agent solution of copper sulfate, dispersing the ZnO-Al2O3 carrier in a sodium hydroxide solution, at a reaction temperature, simultaneously adding the ammonia water solution and the reducing agent solution of the copper salt into the sodium hydroxide solution containing the carrier, continuously stirring the solution, and continuously stirring the solution after addition; and finally, washing, drying, roasting and moulding a solid obtained by solid-liquid separation to obtain the copper, zinc and aluminum catalyst. The copper, zinc and aluminum catalyst prepared by the preparation method has the advantages that the active ingredient Cu is small in grain size and high in dispersity. Compared with a catalyst prepared by virtue of a traditional coprecipitation method or a step-by-step precipitation method, the methanol yield is high and the thermal stability is good.

This invention discloses an ethyl benzene oxy-dehydrogenation catalyst, its feature is that it is mainly consisted by active constituent and auxiliary agent, the active constituent said is molecular sieve with vanadium element in bone frame structure, and the auxiliary agent is alkali metal or. The content of the auxiliary agent computed as metal oxide in every gram catalyst is 0.01-3.0mmol.

The present invention discloses a method for preparing high performance water-proofing and anti-corrosion paint. The components of the water-proofing and anti-corrosion paint take waste polystyrene plastic foams as a basal material. The water-proofing and anti-corrosion paint also comprises rubber, colophony, ethyl acetate, toluene, solvent and toluene di-isocyanate. According to weight portion mixture ratio, the basal material is weighted by 100 weight portion, and other components by weight portion of the water-proofing and anti-corrosion paint are: 30 to 60 weight portions of rubber, 10 to 20 weight portions of colophony, 30 to 60 weight portions of ethyl acetate, 30 to 60 weight portions of toluene, 50 to 70 weight portions of solvent and 1 to 5 weight portions of toluene toluene di-isocyanate. The preparing method comprises the following steps: firstly, placing fragments of the waste polystyrene plastic foams used as the basal material in a reactor; secondly, adding the colophony, the ethyl acetate, the toluene, the solvent and the toluene toluene di-isocyanate according to the mixture ratio, heating and dissolving the form plastics to be foamless; and finally, adding the rubber, mixing the components to be pasty, pulling out filaments and filtering. The paint prepared by the method has the advantages of high dispersity and penetrability, good weather resistance, acid, base and high temperature resistance, low preservation requirement, stable performance, simple preparing process, low process condition and low integrated cost. In addition, the method uses the waste polystyrene plastic foams as the basal material, thereby making waste into valuable and reducing the white pollution.

The invention discloses a preparation method of a compound type methanation catalyst. The preparation method comprises the following steps: firstly, mixing tetrabutyl titanate with anhydrous ethanol to obtain a mixed solution of tetrabutyl titanate and ethanol, mixing deionized water, anhydrous ethanol and nitric acid to obtain a mixed aqueous solution of ethanol and nitric acid, adding the mixed aqueous solution of ethanol and nitric acid into the mixed solution of tetrabutyl titanate and ethanol to obtain a sol, drying to form a gel, and calcining in a muffle furnace to obtain nano TiO2 powder; secondly, mixing the nano TiO2 powder with deionized water to form a suspension, preparing a Na2CO3 solution as a precipitant, preparing a solution of Ni(NO3)2 and Al(NO3)3 or a solution of M(NO3)x, Ni(NO3)2 and Al(NO3)3 to serve as a catalyst precursor, injecting the precursor into the nano TiO2 suspension at the same time until complete deposition, then aging continuously, and filtering the solution to obtain a filter cake; and finally, washing the filter cake by using deionized water, drying the filter cake, and then calcining the filter cake to obtain a NiO/TiO2/Al2O3 catalyst or a NiO-M/TiO2/Al2O3 catalyst. By adopting the preparation method disclosed by the invention, the reaction activity, poisoning resistance, carbon deposition resistance and service life of the catalyst are greatly promoted.

The invention discloses a method for preparing hexamethylenediamine by using a fixed bed reactor, and the method comprises the following steps: introducing raw materials containing adipic dialdehyde,ammonia gas and hydrogen into a reactor loaded with a catalyst, and carrying out contact reaction to generate the hexamethylenediamine; wherein the Ni-based catalyst is prepared from hydrotalcite containing Ni < 2 + >. According to the method, the Ni-based hydrotalcite catalyst loaded with an alkali metal is adopted to catalyze the adipic dialdehyde to prepare the hexamethylenediamine through reductive amination, so that the use of highly toxic raw material adiponitrile is avoided, and the route is clean and environment-friendly.

The invention relates to a method for preparing cholestenone by using a eutectic mixture as a solubilization promoting agent through resting cell transformation. The method comprises the steps of (1) performing centrifugation after resting cells are cultivated in a fermentation medium, and adding a sterile phosphate buffer solution for re-suspension so as to be used as transformation liquid, wherein the resting cells have the capacity of preparing cholestenone by oxidizing cholesterol; (2) feeding cholesterol into the transformation liquid, adding the eutectic mixture serving as the solubilization promoting agent, extracting the transformation liquid by ethyl acetate, and detecting the yield of a product 4-cholesten-3-one by an HPLC (high performance liquid chromatography) method; (3) separating the substrate cholesterol from the product cholestenone through a column chromatography separation method, and purifying to obtain a pure cholestenone product. According to the method, the eutectic mixture (DES) replaces an organic solvent such as methyl alcohol and serves as a green additive; after the eutectic mixture is added, the dispersion rate of the substrate is increased, contact of the substrate cholesterol and bacteria is effectively promoted, and the transformation efficiency of the resting cells is effectively improved; in adding and transforming processes, the operation conditions are mild, and the steps are simple.

The invention discloses a preparation method of a palladium carbon catalyst. The preparation method of the palladium carbon catalyst comprises the following steps: dipping pretreated activated carboninto a palladium salt solution, adsorbing the palladium solution by the activated carbon, forming precipitate of palladium hydroxide through an alkali solution and the palladium salt solution and attaching the precipitate to the activated carbon. Through accurate control over various factors such as the palladium salt concentration, the alkali liquid concentration, activated carbon dipping and thelike, the palladium carbon catalyst with high palladium metal dispersity, high microcrystal content and high use properties of high surface activity and long service life is prepared; furthermore, the method is simple, pollutants are few and the recovery rate is high.

The invention discloses an iron-base composite oxide catalyst for producing styrene by CO2 oxidative dehydrogenation of ethylbenzene. Specifically, Gamma-Al2O3 is a carrier of the catalyst, FeOx is an active component thereof, and one of TiO2, PdO, ZnO and V2O5 is an additive of the catalyst; the catalyst is prepared by an atomic layer deposition method. Since the catalyst is used for producing styrene by CO2 oxidative dehydrogenation of ethylbenzene, selectivity of styrene reaches 95% above, and conversion rate of ethylbenzene reaches 65% above and even is up to 85% around. Besides, in preparation of the catalyst, liquid phase procedures such as dissolution and deposition of precursors are omitted, and the precursors disperse in surfaces and holes of the carrier directly; thus, the active component of the catalyst has high dispersity. In addition, the preparation method of the catalyst is simple with requirements for short cycle and mild condition.

A highly dispersed supported core-shell structure Pd @ Ni/WC direct alcohol fuel cell catalyst and its preparation method belong to the field of energy materials and electrochemical technology. Firstly, porous WC support was prepared by calcination of SiO2 at high temperature. Ni/WC was prepared by chemical reduction using NiCl _ 2 -6 H _ 2O as Ni source. Finally, Ni atoms on Ni surface were substituted for Pd by substitution method, and the catalyst with Ni nanoparticles as core and Pd as shell was obtained. As that core-shell structure nanoparticle of the invention are uniformly dispersed onthe surface of the WC carry with high conductivity, the core-shell structure can improve the conduction of alcohols and electrons, and the bimetallic alloy has a synergistic structure and an electronic effect, and also can improve the catalytic performance; and the core-shell structure nanoparticles of the invention are uniformly dispersed on the surface of the WC carry with high conductivity. Asthat preparation process of the invention is simple, the raw material cost is low and the source is rich, the cost can be reduced, and the invention is favorable for large-scale production.