A kind of preparation method of platinum alloy nano powder catalyst

Abstract

A method for preparing a platinum alloy nanopowder catalyst, including the following steps: 1) preparing a mixed solution of chloroplatinic acid and at least one transition metal salt or noble metal salt and at least one alkali metal salt or alkaline earth metal salt; 2) adding the steps 1) The obtained mixed solution is spray dried or freeze-dried to obtain a dry powder sample; 3) The powder sample obtained in step 2) is annealed in a reducing atmosphere at a temperature lower than the melting point of the alkali metal salt or alkaline earth metal salt, so that platinum and Transition metal alloying to obtain a platinum alloy; 4) Dissolve the alkali metal salt or alkaline earth metal salt in the product in step 3 with water, and obtain a platinum alloy nanopowder catalyst after washing and drying; the mixed solution includes transition metal salts or noble metal salts, and alkali metal salts Or alkaline earth metal salts, solvents; the transition metal salts include nitrates, chlorides, carbonates, acetates, and oxalates of iron, cobalt, nickel, copper, molybdenum, and tungsten.

Description

technical field [0001] The invention relates to a preparation method of a platinum alloy nano-powder catalyst, belonging to the fields of nano-material synthesis and electrochemistry. Background technique [0002] Platinum-based nanocatalysts have suitable adsorption / desorption capabilities for reactants and products, and play an extremely important role in heterogeneous catalytic reactions such as environmental catalysis, fuel cells, and fine chemicals. For example, the active components of the three-way catalyst for purifying automobile exhaust gas are platinum group elements, and platinum-based nanostructured electrodes show excellent performance in the electrocatalytic reaction of fuel cells. Due to the scarcity and high price of platinum metal, reducing its usage while maintaining or even improving its catalytic performance and its recycling rate has become the focus of research. The preparation of nanocatalysts with smaller particle size and thinner thickness of plati...

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Problems solved by technology

However, the particle size, consistency, and controllability of the crystal structure of the platinum alloy catalyst prepared by the high-temperature reduction method are still outstanding, which greatly affects the catalytic performance of the platinum alloy catalyst.

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