In situ DRIFTS investigation for the oxidation of toluene by ozone over Mn/HZSM-5, Ag/HZSM-5 and Mn-Ag/HZSM-5 catalysts

被引：205
|
作者：
Li, Jiao [1 ,2 ]
Na, Hongbo [1 ,2 ]
Zeng, Xiaolan [1 ,2 ]
Zhu, Tianle [1 ,2 ]
Liu, Zhiming [3 ]
机构：
[1] Beihang Univ, Sch Chem & Environm, Beijing 100191, Peoples R China
[2] Beihang Univ, Minist Educ, Key Lab Bioinspired Smart Interfacial Sci & Techn, Beijing 100191, Peoples R China
[3] Beijing Univ Chem Technol, State Key Lab Chem Resource Engn, Beijing 100029, Peoples R China
来源：
APPLIED SURFACE SCIENCE | 2014年 / 311卷
基金：
中国国家自然科学基金;
关键词：
In situ DRIFTS; Toluene ozonation; Mn-Ag/HZSM-5; catalyst; PHOTOCATALYTIC OXIDATION; MANGANESE OXIDES; REMOVAL; COMBUSTION; ADSORPTION; REACTIVITY; AIR; MN; DECOMPOSITION; DEACTIVATION;
D O I：
10.1016/j.apsusc.2014.05.138
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The mechanism of toluene oxidation at room temperature over Mn/HZSM-5, Ag/HZSM-5 and Mn-Ag/HZSM-5 catalysts was investigated by in situ DRIFTS. The results show that only a little toluene can be partially oxidized into benzyl alcohol in the absence of O-3, while it can be further oxidized into benzaldehyde, benzoic acid, maleic anhydride, and ultimately mineralized to CO2 in the presence of O-3. The lattice oxygen is the oxygen species of oxidizing toluene into benzyl alcohol, and the active oxygen species generated from ozone decomposition on the oxygen vacancy over the catalysts are responsible for its complete oxidation. Compared with Mn/HZSM-5 and Ag/HZSM-5 catalysts, the Mn-Ag/HZSM-5 catalyst shows higher catalytic activity for toluene oxidation by ozone, which is attributed to more oxygen vacancy in this catalyst, based on the XPS characterization results. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码：690 / 696
页数：7
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