纳米金催化剂在CO低温氧化和选择性氧化中的研究进展

Nano-sized gold catalysts for CO low-temperature oxidation and selective oxidation

介绍了纳米金催化剂在CO低温氧化和丙烯直接环氧化反应中的研究进展。在CO低温氧化反应中,催化剂的活性相和载体都具有明显的尺寸效应,纳米金颗粒和载体之间的相互作用主要表现载体不仅可以改变纳米金颗粒的大小和形状,而且也影响了氧的活化,从而提高反应活性;在丙烯直接环氧化反应中,由H2和O2在金颗粒表面反应生成的过氧化物种是反应中间体;在选择性氧化和选择性加氢反应中,金催化剂表现出优良的活性和稳定性。

In this paper, nano-sized Au catalysts for CO oxidation and selective oxidation are reported. It was found that for CO oxidation, both active phase and support had size effect. The interaction between active phase and support had remarkable influence on the activity, by affecting not only the size and shape of gold particle, but also the activation of oxygen. For propylene epoxidation, characterization revealed that the hydroperoxide species formed on Au surface by reaction of H2 and O2 was the intermediate of the reaction.