常温(低温)CO氧化反应纳米金催化剂的研究

Review of nanosize gold catalyst for carbon monoxide low-temperature oxidation

纳米金催化剂对CO低温氧化具有很高的催化活性,而且抗水性、稳定性都优于其他催化剂,具有广阔的应用前景。但在实验研究中发现,金催化剂的活性随制备方法、预处理条件、载体、金颗粒大小等的不同会出现较大差异。造成这种差异的原因,从根本上说是由于人们对这种新型催化剂的活性位数目、性质还不能实现有效控制。本文在简要回顾多种因素影响金催化剂活性的实验事实的基础上,综述了对活性本质的最新研究成果,以期为高活性、高稳定性的金催化剂的制备提供理论参考。

Nanosize catalysts have been shown good catalytic performances for CO low-temperature oxidation in addition to superior catalytic behaviors such as high stability and resistance to moisture compared with other catalysts for CO oxidation, showing a more extensive application prospects. It, however, was found that the activity of nanosize catalysts were affected by preparation method, pretreatment conditions, support and particle size. Ultimately, the variation in catalytic activity is due to the lack of control in the generation of the active site, either in terms of its number or its properties. In this review, the nature of the active site and the corresponding reaction mechanism were discussed after a brief introduction of experimental results referred to the factors affecting the catalytic activity.