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Competitive Adsorption of O2 and Toluene on the Surface of FeOx/SBA-15 Catalyst

Category: Control Techniques and Strategy

Volume: 17 | Issue: 9 | Pages: 2310-2316
DOI: 10.4209/aaqr.2016.05.0186
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Meijuan Lu1,2, Rong Huang1,3, Weicheng Xu1, Junliang Wu1, Mingli Fu1, Limin Chen1, Daiqi Ye 1

  • 1 College of Environment and Energy, South China University of Technology, Guangzhou 510006, China
  • 2 School of Environmental and Land Resource Management, Jiangxi Agricultural University, Nanchang 330045, China
  • 3 College of Natural Resources and Environmental, South China Agricultural University, Guangzhou 510642, China

Highlights

Toluene and O2 showed the competitive adsorption on 3%FeOx/SBA-15 catalyst surface.
Fe2+ was one of active adsorption sites for O2 and toluene.
Competitive adsorption could not impact the adsorption state of toluene.


Abstract

The adsorption of volatile organic compounds (VOCs) and O2 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%FeOx/SBA-15 were measured under the various O2 concentrations. The results showed that the breakthrough time of toluene reduced with increasing O2. Competitive adsorption was observed on the catalyst surface between O2 and toluene. The catalysts adsorbed the toluene under the various O2 concentrations were characterized by O2 temperature-programmed desorption (O2-TPD), and X-ray photoelectron spectroscopy (XPS). The desorption amounts of O2 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%MnOx/SBA-15 indicated the competitive adsorption site of O2 and toluene was FeOx. 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 O2, and the O2 adsorbed on the catalyst could oxidize toluene.

Keywords

O2 adsorption Toluene adsorption Competitive adsorption Oxygen source


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