Dalian Institute of Chemical Industry made new progress in gold catalyst research

Recently, the Institute of Aerospace Catalysis and New Materials of the Dalian Institute of Chemical Physics, Chinese Academy of Sciences has made new progress in gold catalyst research. For the first time, a strong metal-metal interaction between gold and non-metal oxides under high temperature oxidation conditions has been discovered (SMSI). ) Effects. Research results were published in the Journal of the American Chemical Society.

In the late 1970s and early 1980s, researchers discovered that Pt group metals supported by reducible carriers such as titanium dioxide lose their adsorption properties for small molecules (CO, H2) after reduction at high temperatures (500°C). The name is Metallic Interaction Strong Interaction (SMSI). SMSI can change the morphology and electronic properties of metal nanoparticles, so it can change the reactivity and selectivity, and has an important influence on the catalytic performance of the catalyst. At the same time, SMSI is usually accompanied by the carrier's embedding of metal particles to a large extent to effectively stabilize the metal particles, which helps to prepare a stable metal catalyst.

Since the late 1980s, due to its unique catalytic properties, the research of supported gold catalysts has received widespread and sustained attention. However, whether the supported gold catalyst can form a strong interaction with the carrier has long been inconclusive. Recently, Ji Zhongyuan, a professor at the National University of Taiwan, discovered for the first time that zinc oxide nanorods loaded with Au nanoparticles can form SMSI under oxidative conditions.

Based on years of research on hydroxyapatite (HAP) supported metal catalysts, the Dalian Institute of Chemical Research Zhang Tao and Wang Junhu first discovered that Au and HAP can form typical SMSI effects. The SMSI effect is identical to the classic SMSI effect except that the conditions are the opposite (the former occurs in an oxidizing environment and the latter occurs in a reducing environment).

The SMSI between Au/HAP can not only improve the high-temperature anti-sintering performance of gold nanoparticles, but also improve the selectivity and reusability of the catalyst in the liquid phase reaction. Further studies found that the SMSI system can be extended to gold and other phosphate systems, such as the Au/LaPO4 system. The study findings provide new ideas and methods for the design and preparation of supported gold catalysts with both high stability and selectivity.

The above research work was funded by the National Natural Science Foundation of China.

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