Atmospheric-pressure O-2 plasma treatment of Au/TiO2 catalysts for CO oxidation

作者：Zhang, Shuo; Li, Xiao-Song; Zhu, Bin; Liu, Jing-Lin; Zhu, Xiaobing^*; Zhu, Ai-Min; Jang, Ben W-L

来源：Catalysis Today, 2015, 256: 142-147.

DOI：10.1016/j.cattod.2015.04.027

• O-2 plasma
• Atmospheric pressure
• Au/TiO2 catalysts
• CO oxidation

Atmospheric-pressure O-2 plasma generated by dielectric barrier discharge (DBD) is applied to treat Au/TiO2 catalysts synthesized via the deposition-precipitation method for CO oxidation. The plasmatreated sample (S-P) presents a higher activity than the calcined one (S-C). To elucidate the plasma treatment effect, XPS, TEM/HRTEM, sub-ambient pulse CO chemisorption and in situ DRIFTS techniques were used for catalyst characterization. In comparison with S-C, TEM/HRTEM reveals that the S-P catalyst has small particle size and narrow size distribution; XPS and DRIFTS analyses indicate plentiful surface hydroxyl groups on S-P sample. Pulse CO chemisorption and in situ DRIFTS of CO adsorption show that significant increase of low-coordinated Au species has been achieved by the plasma treatment. The improved activity of S-P is ascribed to large amount of low-coordinated Au species and interface active sites as well as abundant surface hydroxyl groups.

• 出版日期2015-11-1
• 单位大连理工大学