Highly dispersed precious metal catalysts are widely used in chemical processes. How to achieve high dispersion of precious metals through the adjustment of preparation methods has always been one of the challenging topics in this field.
Study on the catalytic activity of highly dispersed iridium catalyst
The research team led by Researcher Zhang Tao and Researcher Wang Xiaodong of Dalian Institute of Chemical Physics, Chinese Academy of Sciences has long been devoted to the research and development of highly dispersed metal catalysts, and has recently made important progress in the development of highly dispersed iridium (Ir) catalysts. The new iron hydroxide-supported iridium (Ir) catalyst prepared by them showed catalytic activity comparable to that of gold catalyst in CO oxidation and CO selective oxidation under H2-rich atmosphere.
The preliminary research results show that the preparation method can be further extended to the preparation of other Pt-group precious metal catalysts, and has universality. The latest research results have been published online in Angew. Chem. Int. Ed.
Hydrogen in industry is mainly derived from hydrocarbon reforming, and the obtained hydrogen source contains trace amounts of CO. When used as fuel cell feed gas, trace amounts of CO can severely poison the electrode catalyst (Pt catalyst) of the fuel cell, reducing the efficiency of the fuel cell. CO selective oxidation (PROX) in a hydrogen-rich atmosphere is one of the most effective ways to eliminate trace CO. The current PROX catalysts are mainly supported Au catalysts. Zhang Tao's research group is devoted to the development of Pt-based and Ir-based PROX catalysts and the study of the reaction mechanism. Not only have they developed single-atom platinum-based highly dispersed catalysts and new iridium-based catalysts, but they have also conducted in-depth studies on the PROX reaction mechanism of such catalysts.
Earlier studies found that the inclusion of iron oxide species in the carrier can greatly improve the catalyst's ability to activate oxygen and thereby increase catalyst activity. On the basis of this knowledge, the latest research used a special ferric hydroxide carrier to provide active oxygen or improve the catalyst's ability to activate oxygen, and successfully prepared a sub-nanometer scale (<1nm) highly dispersed Ir-based catalyst. The characterization proves that the ferric hydroxide carrier has a significant role in improving the catalyst's ability to activate oxygen.
Compared with the standard Au / Fe2O3 catalyst (currently recognized as a highly active catalyst for CO oxidation), the catalyst not only has considerable activity (at room temperature CO conversion), but also has a wider CO conversion temperature window (20-60 ° C) , Provides new ideas and options for the development and application of high-activity PROX catalysts.
A.Product description:
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