Competitive Adsorption of O_2 and Toluene on the Surface of FeO_x/SBA-15 Catalyst

Meijuan Lu ； Rong Huang ； Weicheng Xu ； Junliang Wu ； Mingli Fu ； Limin Chen ； Daiqi Ye

《Aerosol and Air Quality Research》 17卷9期 (2017/09) Pp. 2310-2316

https://doi.org/10.4209/aaqr.2016.05.0186

摘要

The adsorption of volatile organic compounds (VOCs) and O_2 on the surface of the catalyst was one of the vital progresses in the plasma-catalytic oxidation of VOCs. In this work the breakthrough curves of toluene adsorption on the 3%FeO_x/SBA-15 were measured under the various O_2 concentrations. The results showed that the breakthrough time of toluene reduced with increasing O_2. Competitive adsorption was observed on the catalyst surface between O_2 and toluene. The catalysts adsorbed the toluene under the various O_2 concentrations were characterized by O_2 temperature-programmed desorption (O_2-TPD), and X-ray photoelectron spectroscopy (XPS). The desorption amounts of O_2 – and the Fe percentage on the catalyst surface were dependent on the O2 concentration during toluene adsorption. The experimental results of pure SBA-15 and 5%MnO_x/SBA-15 indicated the competitive adsorption site of O_2 and toluene was FeO_x. In situ FTIR data of toluene adsorption on the catalyst surface indicated that the adsorption state of toluene could not be impacted by the competitive adsorption of O_2, and the O_2 adsorbed on the catalyst could oxidize toluene.

關鍵字

O_2 adsorption ； Toluene adsorption ； Competitive adsorption ； Oxygen source