Au/TiO_2-B催化剂的CO低温氧化性能  

Au/TiO_2-B catalyst for low-temperature CO oxidation

作　　者：王喜兵[1] 纪拓[1] 李力成[2] 杨祝红[1] 陆小华[1] 

机构地区：[1]南京工业大学材料化学工程国家重点实验室,江苏南京210009 [2]南京林业大学化学工程学院,江苏南京210037

出　　处：《化工学报》2014年第5期1636-1643,共8页CIESC Journal

基　　金：国家重点基础研究发展计划项目(2013CB733503)~~

摘　　要：探索Au纳米粒子对新型材料的催化性能可以显著拓宽金催化剂的应用范围。使用TiO2-B作为载体，担载Au纳米粒子并应用于低温CO氧化反应体系。TiO2-B为长度5～20μm的微米级纤维，Au纳米粒子粒径在3 nm以下，均匀地分散在TiO2-B表面。CO 氧化测试表明，Au纳米粒子的性能受TiO2-B焙烧温度的影响，不同焙烧温度会引起Au分散性以及Au纳米粒子与载体相互作用的改变。分散于纯TiO2-B载体上的金的催化活性可与其分散在锐钛矿纳米粉体上的相媲美。此外，300℃下活化的Au纳米粒子表现出了最佳的CO氧化性能，在氧化性气氛中活化的催化剂的催化性能优于在惰性和还原性气氛中活化的催化剂。Exploring the catalytic performance of gold nanoparticles on the novel materials can effectively extend the application of gold catalyst. In this case, TiO2-B is used as a support to load gold nanoparticles for low-temperature CO oxidation. The TiO2-B was shaped in micron-scale fibers with length of 5-20μm, and the gold nanoparticles with size of~ 3 nm could be uniformly dispersed on the surface of TiO2-B. CO oxidation tests showed that the catalytic performance of gold nanoparticles was influenced by calcination temperature of TiO2-B which gave rise to the difference in gold dispersion and interaction between gold nanoparticles and support. The activity of gold deposited on the support with pure TiO2-B phase could exceed/match that on anatase nanopowders. Moreover, the gold nanoparticles activated at 300℃ showed the best CO oxidation performance, and the catalyst activated in oxidative atmosphere had a better catalytic performance than that in inert or reductive atmosphere.

关 键 词：催化剂 纳米粒子 CO氧化 活化 

分 类 号：O643[理学—物理化学] TQ42[理学—化学]