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573results about How to "High catalytic activity" patented technology

Method for preparing three-dimensional carbon framework embedded nano platinum-based alloy catalyst

InactiveCN107331877AHigh catalytic activityImprove catalytic stabilityMaterial nanotechnologyCell electrodesIonPt based catalysts
The invention discloses a method for preparing a three-dimensional carbon framework embedded nano platinum-based alloy catalyst, and aims to solve the problems that a conventional Pt-based catalyst is low in activity, poor in stability and Pt utilization rate. According to the method, in the growth process of a zeolite imidazolate framework structural material (ZIF), Pt nanoparticles modified by a surfactant are uniformly wrapped in a ZIF structure, the high-temperature reduction process is precisely regulated, the ZIF carbonization, metal reduction and alloying process is controlled, and thus a catalyst structure of a three-dimensional carbon framework embedded nano platinum alloy is constructed. According to the method, the structural shrinkage effect of the carbonization process is smartly utilized, the ZIF structure is converted into a three-dimensional through carbon framework pore structure, the range limiting function of a ZIF framework at high temperature is smartly utilized, platinum particles and metal ions in the ZIF structure are subjected to in-situ alloying and embedded into the framework structure, then the three-dimensional catalyst of a pore-communicated framework and a nano-grade platinum alloy particle embedded structure is formed, the activity and the stability of the catalyst are greatly improved, and the utilization rate of Pt is greatly increased.
Owner:CHONGQING UNIV

Method for preparing efficient stable fuel cell catalyst

The invention provides a method for preparing an efficient stable fuel cell catalyst and aims to solve the defect that an existing fuel cell catalyst is low in property and poor in stability. The method provided by the invention is characterized in that polyaniline covers the surface of a Pt/C catalyst through using an in-situ chemical oxidation polymerization method, and further an N-doped carbon layer is formed under transition metal salt catalysis through high-temperature pyrolysis; on one hand, the formed N-doped carbon layer is utilized as a second active centre and can strengthen the catalytic activity with Pt synergism, on the other hand, the migration and birdnesting growth of Pt nano particles on the surface of a carbon support are effectively blocked, and the stability of a catalyst is improved; in addition, the nanometer limited range action of the polyaniline can effectively restrain the sintering growth of the Pt nano particles on the surface of the carbon support in the high-temperature processing process, and the high activity specific surface area of a final catalyst is guaranteed; the oxygen reduction activity and the stability of the prepared Pt/C catalyst modified by the N-doped carbon layer are remarkably better than those of a commercialization Pt/C catalyst.
Owner:重庆铈坦新材料技术研究院有限公司

High-efficiency multi-element transition metal phosphide hydrogen-evolution catalyst and preparation method thereof

InactiveCN105720278AHigh catalytic activityReduce the cost of hydrogen productionCell electrodesIonTube furnace
The invention discloses a high-efficiency multi-element transition metal phosphide hydrogen-evolution catalyst and a preparation method thereof. The catalyst is Co<x>Fe<y>P and is formed by being loaded in carbon cloth by a hydrothermal method. The preparation method of the catalyst comprises the following steps of preparing a precursor by the hydrothermal method, adding a certain amount of a mixture of Co(NO<3>)<2>.6H<2>O and Fe(NO<3>)<3>.9H<2>O into deionized water to form an uniform mixed solution, placing the mixed solution in a reaction kettle, adding carbon cloth (CC) as a carrier, uniformly adding strong ammonia water, hermetically heating the mixed solution to 110-120 DEG C, carrying out heat preservation for 9-10 hours, taking out the CC, and drying the CC to obtain the precursor; and carrying out low-temperature phosphorization on the precursor, separately placing NaH<2>PO<2> and the precursor in an upstream and a downstream of a tube furnace, introducing nitrogen or inert gas, heating the tube furnace to 300-350 DEG C, and carrying out heat preservation for over 2 hours to obtain the hydrogen-evolution catalyst. Compared with the prior art, the hydrogen-evolution catalyst prepared according to the method is endowed with high-efficiency and stable catalytic hydrogen evolution capability in an acidic solution, and the hydrogen production cost through electrolysis of water can be reduced.
Owner:HUAZHONG UNIV OF SCI & TECH

Synthetic method of sliver/ferroferric oxide/silicon dioxide/titanium dioxide four-layer nuclear shell structure and application thereof

The invention discloses a synthetic method and application of a sliver/ferroferric oxide/silicon dioxide/titanium dioxide four-layer nuclear shell structure. The synthetic method of the sliver/ferroferric oxide/silicon dioxide/titanium dioxide four-layer nuclear shell structure comprises the steps of firstly preparing a sliver/ferroferric oxide nuclear shell structure by using a solvothermal method; then preparing a sliver/ferroferric oxide/silicon dioxide three-layer structure on the basis of the nuclear shell structure by using a stober method; coating a layer of burr shape titanium oxide composed of nanosheets on the surface of the three-layer structure obtained in the step B by using the solvothermal method to obtain a sliver/ferroferric oxide/silicon dioxide/titanium dioxide (AgFe3O4SiO2TiO2) four-layer nuclear shell structure. The four-layer nuclear shell structure is good in absorption characteristic, photocatalytic performance and superparamagnetism for removal of organic pollutants or heavy metal pollutants, so that the treatment effect of the organic pollutants and the heavy metal pollutants in sewage can be greatly improved.
Owner:HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI

Low-temperature hydrolysis method for removing carbonyl sulfide in liquefied petroleum gas

ActiveCN103992831AHigh catalytic activityImprove the conversion rate of hydrolysisGaseous fuelsMetal/metal-oxides/metal-hydroxide catalystsChemistryHydrogen sulfide
The invention provides a low-temperature hydrolysis method for removing carbonyl sulfide in liquefied petroleum gas. The method comprises the following steps: mixing the liquefied petroleum gas after amine washing with an alcohol amine solution, and performing hydrolysis reaction under the action of a carbonyl sulfide hydrolysis catalyst to remove carbonyl sulfide and hydrogen sulfide in the liquefied petroleum gas and hydrogen sulfide generated by hydrolysis; separating the liquefied petroleum gas from the alcohol amine solution, then washing with water to obtain the refined liquefied petroleum gas and recycling the alcohol amine solution, wherein the adding amount of the alcohol amine solution is 0.1%-20% of the weight of the liquefied petroleum gas. By adopting the low-temperature hydrolysis method for removing carbonyl sulfide in the liquefied petroleum gas provided by the invention, carbonyl sulfide and hydrogen sulfide in the liquefied gas can be removed in one step under the condition of 10-60 DEG C, the step of removing hydrogen sulfide in a conventional process is eliminated, the process is simple, the activity of the catalyst is high, the service life is long and the conversion rate of carbonyl sulfide is above 97%.
Owner:BC P INC CHINA NAT PETROLEUM CORP +3
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