M-N(M=Ag,Au; N=Pd,Rh,Co)合金纳米团簇光催化剂性能与机理研究

金、银等贵金属纳米团簇，由于表面等离子体共振，在可见光区产生强烈的吸收。最近一些研究表明，金、银纳米团簇在可见光区能作为光催化剂，催化一些有机化学反应。其催化机制有别于半导体类光催化剂，有较高的转化频率(TOF)。受此启发，本项目中提出，金、银与其它催化活性金属如铑、钯、钴形成的合金团簇在可见光区可能也有光催化活性，在光照下能更高效的催化一些化学反应。在热反应条件下，对许多化学反应来说，合金团簇比纯金属团簇有更好的催化性能。本项目中，将探讨金、银与钯、铑和钴形成的合金纳米团簇对一些氧化还原反应和偶联反应的光催化活性，并结合实验与理论计算，对相关的催化反应机理进行深入、全面地研究。通过本项目的进行，将加深对金属纳米团簇光催化反应机制的认识，拓展合金纳米团簇在光催化反应领域的使用，促进太阳能在化学化工合成中的应用。

The nano-cluster of noble metal such as silver and gold, due to the surface plasmon resonance effect, shows strong absorption of visible light. Some recent investigations indicated that these nano-clusters can accelerate some organic chemical reactions as photocatalyst under visible-light irradiation. With higher tuner over frequency, the catalytic mechanism of these nano-cluster photocatalysts are different from that of the classic semiconductor photocatalysts.Inspired by the high photocatalytic activity of these metal nano-cluster, we suggest that the alloy nano-clusters of silver or gold with palladium, rhodium or cobalt maybe also are potentail photocatalyst, which can accelerate some chemical reactions under visible-light irradiation even at low temperature. For many reactions in normal condition, alloy nano-cluster catalyst is more active than pure metal nano-cluster. In this project, the photocatalytic activity of alloy namo-clusters of Au or Ag with palladium, rhodium or cobalt will be investigated by testing some redox reactions and coupling reactions under visible light irradiation. By combining the experimental method and theoretical calculation, the photocatalytic mechanism of these reaction will be investigated comprehensively and systematically. Our project will increase the knowledge about the photocatalytic mechanism of metal nano-cluster, and develop more efficient alloy nano-cluster photocatalys, and promote the usage of solar energy in organic synthesis in chemical industry.