51results about How to "Improve the ability to resist CO poisoning" patented technology

The invention discloses a PtRu binary metal nano-alloy catalyst which is of a flower-shaped (porous) structure. The synthetic method of the PtRu binary metal nano-alloy catalyst is characterized by comprising the steps that 1, a surface active agent and a reducing agent are added into water together, and stirring is conducted for 10-30 minutes at the indoor temperature, wherein the mass ratio of the surface active agent to the reducing agent is 1:2-2:1, and the amount of added water needs to meet the requirement that both the surface active agent and the reducing agent are completely dissolved in the water; 2, a metallic platinum salt pecursor solution and a metallic ruthenium salt pecursor solution are added in the mixed solution obtained in the first step, and stirring is conducted for 10-30 minutes at the indoor temperature,wherein the volume ratio of the platinum salt pecursor solution to the metallic ruthenium salt pecursor solution is 3:2-2:3, the ratio of the volume of the mixed solution to the total volume of the metallic pecursor solutions is 10:1-20:1, and the concentration of the metal salt precursor solution is 0.05-0.5 mol/L; 3, the mixed solution obtained in the second step is stirred for 5-30 minutes at the indoor temperature, a reaction is conducted in an autoclave for 1.5-3 hours, and the temperature is controlled to be 180-230 DEG C; 4, the product obtained in the third step is cooled and then is washed, and the PtRu binary metal nano-alloy catalyst of the flower-shaped (porous) structure is obtained after centrifugal separation.

The invention provides a hollow core-shell Pt@Ni/graphene three-dimensional composite catalyst and a preparation method. A PtNi nano alloy of a hollow core-shell structure is uniformly loaded on the surface of graphene by virtue of an electrochemical deposition method by taking the graphene as a carrier and a polymer nanosphere as a template. The catalyst is represented by adopting a SEM and an electrochemical method. The composite catalyst is uniformly deposited among graphene sheet layers, so as to effectively prevent accumulation between graphene nanosheets, improve the dispersion degree of the catalyst and increase the active surface area of the catalyst. Test results of cyclic voltammetry and chronoamperometry show that the hollow core-shell Pt@Ni/graphene three-dimensional composite catalyst is relatively good in catalytic activity and CO poisoning resistance on methanol oxidation and also is good in stability.

The invention relates to the field of fuel cell material preparation, in particular a process for preparing multi-component catalyst for proton interchange film fuel cells through water heating method which comprises, charging carrying agent, one or two noble metallic compounds, one or two rare earth metallic oxides, and deionized water into air-tight container in inert atmosphere under the condition of 110-300 deg. C, pressure 0.3-4 MPa for reaction 1-24 hours, cooling down and adding reduction agent, deacidizing 1-10 hours at 100-200 deg. C, washing, filtering and drying to obtain the multicomponent catalyst.

The invention discloses a preparation method of a PtRu/C binary alloy nano catalyst. The preparation method comprises the following steps of: dissolving active carbon in water and then heating up and stirring to obtain carbon paste; sequentially dropping H2PtCl6, RuCl3 and a metal protector into the carbon paste, then stirring by using ultrasound and regulating the pH value to 8; slowly dropping a reducing agent; and carrying out vacuum filtration, washing and vacuum drying after reacting to finally obtain the PtRu/C binary alloy nano catalyst. The obtained PtRu/C binary alloy nano catalyst has good dispersity and strong capacity of resisting CO poisoning, and meanwhile, because the particle size range of the obtained PtRu/C binary alloy nano catalyst is 3-5 nm, the PtRu/C binary alloy nano catalyst has the characteristic of narrow particle size range; the agglomeration of PtRu/C binary alloy particles is slowed down, and the stability of the alloy is increased; meanwhile, the catalytic activity of the PtRu/C binary alloy nano catalyst to methanol is also improved to certain degree. The preparation method has the advantages of simple and convenient operation, less time consumption, and the like.

The present invention provides a direct methanol fuel cell anode catalyst and its preparing method, the product is composed of a porous-nano TiO2 or porous-nano TiO2-SiO2 and active carbon, Pt, Ru. A multivariant catalyst is formed by combined highly active porous-nano TiO2 or porous-nano TiO2-SiO2 and active carbon, Pt, Ru, the surface of TiO2 or TiO2-SiO2 deposits a little noble metal Pt, Ru, the PtRu/TiO2 or PtRu/TiO-SiO2 composite powder of high activity is formed, noble metal Pt and CO generated by methanol anodic oxidation are absorbed, transferred to the surface of composite powder, and overoxidized to final product CO2, reduces the use of noble metal such as Pt, Ru, greatly enhances CO inhibiting ability of catalyst.

The invention discloses a catalyst for selectively hydrogenating an ethylenically unsaturated carbonyl compound as well as a preparation method and application of the catalyst. The catalyst comprises,on the basis of the weight of a carbon carrier, 0.05 to 10 wt% of ruthenium, 0.05 to 5 wt% of molybdenum and 0.05 to 5 wt% of iron, as a preferred embodiment, ruthenium is modified by nitrogen. The catalyst is especially suitable for preparing citronellal and/or dihydrocitronellal through high-selectivity hydrogenation of citral, and preparing dihydrocitronellal through high-selectivity hydrogenation of citronellal. The catalyst can inhibit the formation of aldehyde substance dimerization, significantly reduce the adsorption of CO, enhance the CO poisoning resistance, and significantly improve the stability in the reuse process.

The invention discloses a preparation method for an N-C-doped TiO<2> nanofiber loaded Pd@Ni positive electrode catalyst for a direct methanol fuel cell. The catalyst comprises the high-conductivity N-C-doped TiO<2> nanofiber and nanometer Pd@Ni with a core-shell structure, wherein the mass content of the N-C-doped TiO<2> nanofiber is 95-97%; the mass content of the nanometer Pd@Ni is 3-5%; and the ratio of n(Pd) to n(Ni) is 1:1. The catalyst provided by the invention has relatively high catalytic oxidation performance; the intermediate products of CO and the like generated by methanol oxidization are absorbed and moved to the surface of the composite catalyst, and are directly and deeply oxidized into a final product-CO<2>; the costs of Ni and Pd are far below than that of noble metals, such as Pt, Ru and the like, and the dosages of Ni and Pd are relatively low in the catalyst; and therefore, the cost of the catalyst is greatly lowered, the catalytic performance and the CO poisoning resistance of the catalyst are greatly improved.

The invention discloses a direct methanol fuel cell PdAg/TiO2 nanotube electrode and a preparation method thereof. The PdAg/TiO2 nanotube electrode is formed in a manner that a positive pole of a titanium plate is oxidized to form nanotubes on the surface, and a nanometer PdAg alloy is deposited though electroplating. After the positive pole of the titanium plate is oxidized by roasting, a thin layer of TiO2 nanotubes with high specific surfaces is formed on the surface of the titanium plate, the electrical conductivity of the TiO2 nanotubes is improved by the PdAg alloy deposited on the surface of the TiO2 nanotubes in an electroplating manner, and a catalytic oxidation of TiO2 on methyl alcohol is greatly improved through the synergistic effect of the PdAg alloy on TiO2; meanwhile, intermediate products, such as CO, generated by methyl alcohol oxidation are adsorbed and transferred to the surfaces of the PdAg/TiO2 nanotubes and are deeply oxidized to obtain a final product CO2, and a CO toxicity resisting capacity of the catalyst is improved; the price of PdAg is lower than that of noble metals such as Pt and Ru, and the dosage of PdAg in the PdAg/TiO2 nanotubes is small, so that the cost of the catalyst is greatly reduced; the PdAg/TiO2 nanotube electrode is utilized as a direct methanol fuel cell anode, and the property of the cell is improved.

The invention includes following steps: adding carbon carrier treated by hydrophilic process into solution of mixing deionized water and islpropanol; adding precursors of Pt, Ru and Ni into even dispersed serum of containing carbon; adjusting pH value of the serum to 3 - 10; adding NaBH4 to serum at 50 - 90 deg.C for carrying out deoxidation for 1 - 5 hours; repeated rinsing Pt - Ru - Ni/C catalyst through ultra pure water inorder to remove interfering ions; under vacuum and 80 - 130 deg.C, drying the obtained catalyst for 1 - 6 hours. Comparing with existing catalysts, the disclosed catalyst possesses advantages of high activity to electrocatalysis and oxidation for alcohols, reducing dose of noble metal, simple technique, rich in material resources.

The invention discloses a direct methanol fuel cell (DMFC) nano PdNi (lead nickel)/mesoporous TiO2 (titanium dioxide) membrane anode and a preparation method thereof. The product consists of a titanium plate and a nano PdNi/mesoporous TiO2 membrane catalyst. The DMFC nano PdNi/mesoporous TiO2 membrane anode is compounded by the nano PdNi/mesoporous TiO2 membrane catalyst and the titanium plate, wherein the nano PdNi/mesoporous TiO2 membrane catalyst consists of PdNi nano alloy and high specific surface mesoporous TiO2 membrane. PdNi alloy can be used for improving the conductivity of TiO2, the synergistic effect of PdNi to TiO2 can be used for improving the catalytic oxidation performance of TiO2 to methanol, and at the same time, CO (carbon monoxide) and the like intermediate products generated by methanol oxidation are adsorbed and transmitted to the surface of the composite membrane catalyst and are directly deeply oxidized into the end product CO2 (carbon dioxide), so that the CO poisoning capability resistance of the catalyst is improved; due to the price of PdNi far lower than that of precious metals such as Pt (platinum) and Ru (ruthenium), and the dosage of PdNi in the membrane catalyst is little, and the compounding of PdNi and the titanium plate is used for the anode of a DMFC, so that the manufacturing cost of the DMFC can be greatly reduced, and the performance of the DMFC is improved.

The invention discloses a catalyst for producing methyl cyclohexanecarboxylate, which consists of three parts, namely a main active component, an additive and a carrier. The main active component is metal palladium. The additive is formed by combining first additive elements and second additive elements, an additive 1 is VIII metal elements, and an additive 2 is elements such as Ca, Mg, Si, B and the like; and the carrier is activated alumina. The catalyst is used for producing the methyl cyclohexanecarboxylate through the hydrogenation of methyl benzoate; and the adding of the two additives into the catalyst improves the ability of the catalyst against CO poisoning and improves catalytic performance. The corrosion problem during the production of the methyl cyclohexanecarboxylate is eliminated, the consumption of the catalyst is reduced, and the separation process of a product and the catalyst is simplified.

The invention relates to a preparation method of a polyfluorene derivative-supported noble metal catalyst. The method comprises the following concrete preparation steps that (1) an electrochemical method is used for synthesizing poly 9-hydroxyfluorene (PHF) and preparing a composite catalyst Pt-Pd/PHF; (2) a glass carbon electrode is ground to the mirror surface state by alpha-aluminum oxide polishing powder, and is cleanly flushed for use; (3) a cyclic voltammetry (CV) method is used for PHF electrochemical synthesis, the same CV turn number is scanned in a certain voltage range; the scanning speed is controlled to be 50mVs<-1>; (4) the obtained polymer modified glassy carbon electrode (PHF/GC) is respectively and cleanly flushed by ethyl alcohol and distilled water and is directly used for Pt-Pd catalyst electro-deposition experiments. The Pt-Pd catalyst particles have uniform dispersion and small particle diameters on the surface of the PHF, so that the large electrochemical active area is realized; the PHF loaded Pt-Pd catalyst (Pt-Pd/PHF) has high electro-catalysis activity on the methanoic acid oxidation.

The invention discloses an anode catalyst for a PdMo/TiO2 nanowire direct methanol fuel cell and a preparation method. The anode catalyst is composed of TiO2 nanowire and PdMo nano-alloy. According to the invention, the TiO2 nanowire having high specific surface area as a carrier is compounded with the PdMo nano alloy, so that a polybasic catalyst is formed; by means of PdMo compounding, the electrical conductivity of TiO2 is increased; the catalytic and oxidative performance of TiO2 to methanol is increased under the synergistic effect to TiO2; meanwhile, intermediate products generated by methanol oxidation, such as CO, are adsorbed and transferred on the surface of the compound catalyst and are deeply oxidized directly to obtain the final product, namely CO2; therefore, the CO poison resistant capability of the catalyst can be increased; the cost of PdMo is far less than that of the noble metals, such as Pt and Ru; the use amount of PdMo in the catalyst is lower; therefore, the cost of the catalyst in the direct methanol fuel cell can be greatly reduced; and the performances of the direct methanol fuel cell are increased.

The invention belongs to the technical field of fuel cells, and relates to a preparation method and application of a porous Pd-PdO nanorod. The preparation method comprises the following steps of: mixing 1, 10-phenanthroline serving as a complexing agent, potassium chloropalladite serving as a palladium source and ethanol and water serving as solvents at normal temperature to obtain a 1, 10-phenanthroline-palladium complex precursor; and calcining the 1, 10-phenanthroline-palladium complex precursor at high temperature under an air condition to obtain the porous Pd-PdO nanorod. The porous Pd-PdO nanorod obtained by the preparation method shows enhanced methanol oxidation reaction activity.

The invention discloses a tungsten carbide-nickel-palladium composite material and a preparation method thereof, and application of the composite material in fuel cells. The tungsten carbide-nickel-palladium composite material uses nickel-doped tungsten carbide as a base, and palladium is loaded on the surface of the base. The preparation method includes the following steps that 1, a mixed solution of ammonium metatungstate and nickel sulfate is subjected to crystallization and blended culture, and a precipitate is dried and calcined to obtain nickel compound-doped tungsten oxide; the obtain tungsten oxide is subjected to pore-forming with a sodium hydroxide solution, dried powder is reduced and carbonized in the CO atmosphere, and the temperature is reduced to obtain a tungsten carbide/nickel composite material; 2, the tungsten carbide/nickel composite material is put in a solution containing palladium compounds for a displacement reaction to obtain the tungsten carbide-nickel-palladium composite material. The preparation steps are simple and the cost is low. The invention further provides the application of the tungsten carbide-nickel-palladium composite material in the anodic reaction of the ethanol fuel cells, the catalytic activity is high, and the anti-poisoning ability is obviously enhanced.

The invention belongs to the technical field of electrocatalysis, relating to a method of modifying and strengthening electrocatalytic activities of formic acid by platinum base materials and improving stability thereof. The Pt base catalyst and an anionic salt of Sb are mixed and dispersed with a reductant under the ultrasonic condition, the reaction time is controlled to obtain the desired Theta sh, and the Theta sh is rapidly filtered, repeatedly washed and vacuum dried at a temperature of 50 DEG C for overnight, thereby obtaining the carbon-carrying platinum catalyst Pt-Sb/C modified by antimony. The method has the advantages that the method is simple and the modified condition is moderate and friendly; the method not only can be used in the Pt body electrode, but also is more suitable for preparation of large-batch catalytic materials; compared with the traditional catalyst, the formic acid catalyzing electrochemical oxidized activity of the obtained product is greatly improved; the obtained product has the excellent electrocatalytic oxidized activity to formic acid and is the promising direct formic acid fuel battery anode catalyst; and the anti-CO poisoning ability is increased.