title: Removal of toluene by sequential adsorption-plasma oxidation: Mixed support and catalyst deactivation.
abstract: A sequential adsorption-plasma oxidation system was used to remove toluene from simulated dry air using γ-Al2O3, HZSM-5, a mixture of the two materials or their supported Mn-Ag catalyst as adsorbents under atmospheric pressure and room temperature. After 120min of plasma oxidation, γ-Al2O3had a better carbon balance (∼75%) than HZSM-5, but the CO2yield of γ-Al2O3was only ∼50%; and there was some desorption of toluene when γ-Al2O3was used. When a mixture of HZSM-5 and γ-Al2O3with a mass ratio of 1/2 was used, the carbon balance was up to 90% and 82% of this was CO2. The adsorption performance and electric discharge characteristics of the mixed supports were tested in order to rationalize this high COxyield. After seven cycles of sequential adsorption-plasma oxidation, support and Mn-Ag catalyst deactivation occurred. The support and catalyst were characterized before and after deactivation by SEM, a BET method, XRD, XPS and GC-MS in order to probe the mechanism of their deactivation. 97.6% of the deactivated supports and 76% of the deactivated catalysts could be recovered by O2temperature-programmed oxidation.
authors.affiliation: School of Environment & Municipal Engineering, Xi'an University of Architecture & Technology, Xi'an 710055, China.
authors.forename: Caihong
authors.initials: C
authors.lastname: Qin
authors.affiliation: School of Environment & Municipal Engineering, Xi'an University of Architecture & Technology, Xi'an 710055, China.
authors.forename: Xuemin
authors.initials: X
authors.lastname: Huang
authors.affiliation: School of Environment & Municipal Engineering, Xi'an University of Architecture & Technology, Xi'an 710055, China.
authors.forename: Junjie
authors.initials: J
authors.lastname: Zhao
authors.affiliation: Research Center of Air Pollution Control Technology, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
authors.forename: Jiayu
authors.initials: J
authors.lastname: Huang
authors.affiliation: School of Environment & Municipal Engineering, Xi'an University of Architecture & Technology, Xi'an 710055, China.
authors.forename: Zhongli
authors.initials: Z
authors.lastname: Kang
authors.affiliation: School of Environment & Municipal Engineering, Xi'an University of Architecture & Technology, Xi'an 710055, China. Electronic address: xiaoqingdang@hotmail.com.
authors.forename: Xiaoqing
authors.initials: X
authors.lastname: Dang
keywords: Adsorption-plasma oxidation; Catalysts; Deactivation; Mixed support; Toluene