Precious metal-support interaction in automotive exhaust catalysts
来源期刊：JOURNAL OF RARE EARTHS2014年第2期
论文作者：郑婷婷 何俊俊 赵云昆 夏文正 何洁丽
文章页码：97 - 107
摘 要：Precious metal-support interaction plays an important role in thermal stability and catalytic performance of the automotive exhaust catalysts.The support is not only a carrier for active compounds in catalysts but also can improve the dispersion of precious metals and suppress the sintering of precious metals at high temperature;meanwhile,noble metals can also enhance the redox performance and oxygen storage capacity of support.The mechanism of metal-support interactions mainly includes electronic interaction,formation of alloy and inward diffusion of metal into the support or covered by support.The form and degree of precious metal-support interaction depend on many factors,including the content of precious metal,the species of support and metal,and preparation methods.The research results about strong metal-support interaction（SMSI） gave a theory support for developing a kind of new catalyst with excellent performance.This paper reviewed the interaction phenomenon and mechanism of precious metals（Pt,Pd,Rh） and support such as Al2O3,CeO2,and CeO2-based oxides in automotive exhaust catalysts.The factors that affect SMSI and the catalysts developed by SMSI were also discussed.
郑婷婷1，何俊俊1，赵云昆1,2，夏文正1，何洁丽1
1. State-Local Joint Engineer Laboratory of Precious Metal Catalytic Technology and Application,Kunming Sino-platinum Metals Catalysts Co. Ltd.2. State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals,Kunming Institute of Precious Metals
摘 要：Precious metal-support interaction plays an important role in thermal stability and catalytic performance of the automotive exhaust catalysts.The support is not only a carrier for active compounds in catalysts but also can improve the dispersion of precious metals and suppress the sintering of precious metals at high temperature;meanwhile,noble metals can also enhance the redox performance and oxygen storage capacity of support.The mechanism of metal-support interactions mainly includes electronic interaction,formation of alloy and inward diffusion of metal into the support or covered by support.The form and degree of precious metal-support interaction depend on many factors,including the content of precious metal,the species of support and metal,and preparation methods.The research results about strong metal-support interaction（SMSI） gave a theory support for developing a kind of new catalyst with excellent performance.This paper reviewed the interaction phenomenon and mechanism of precious metals（Pt,Pd,Rh） and support such as Al2O3,CeO2,and CeO2-based oxides in automotive exhaust catalysts.The factors that affect SMSI and the catalysts developed by SMSI were also discussed.
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