Study of nitric oxide catalytic oxidation on manganese oxides-loaded activated carbon at low temperature

被引:35
作者
You, Fu-Tian [1 ,2 ]
Yu, Guang-Wei [1 ]
Wang, Yin [1 ]
Xing, Zhen-Jiao [1 ]
Liu, Xue-Jiao [1 ,2 ]
Li, Jie [1 ,2 ]
机构
[1] Chinese Acad Sci, Key Lab Urban Pollutant Convers, Inst Urban Environm, Xiamen, Peoples R China
[2] Univ Chinese Acad Sci, Beijing, Peoples R China
关键词
Nitric oxide catalytic oxidation; Manganese oxide; Activated carbon; Low temperature; NO OXIDATION; ROOM-TEMPERATURE; MNOX/TIO2; CATALYSTS; ELEMENTAL MERCURY; SURFACE-AREA; FIBER ACF; REDUCTION; ADSORPTION; MNO2; MECHANISM;
D O I
10.1016/j.apsusc.2017.04.044
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
Nitric oxide (NO) is an air pollutant that is difficult to remove at low concentration and low temperature. Manganese oxides (MnOx)-loaded activated carbon (MLAC) was prepared by a co-precipitation method and studied as a new catalyst for NO oxidation at low temperature. Characterization of MLAC included X-ray diffraction (XRD), scanning electron microscopy (SEM), N-2 adsorption/desorption and X-ray photoelectron spectroscopy (XPS). Activity tests demonstrated the influence of the amount of MnOx and the test conditions on the reaction. MLAC with 7.5 wt.% MnOx (MLAC003) exhibits the highest NO conversion (38.7%) at 1000 ppm NO, 20 vol.% O-2, room temperature and GHSV ca. 16000 h(-1). The NO conversion of MLAC003 was elevated by 26% compared with that of activated carbon. The results of the MLAC003 activity test under different test conditions demonstrated that NO conversion is also influenced by inlet NO concentration, inlet O-2 concentration, reaction temperature and GHSV. The NO adsorption-desorption process in micropores of activated carbon is fundamental to NO oxidation, which can be controlled by pore structure and reaction temperature. The activity elevation caused by MnOx loading is assumed to be related to Mn4+/Mn3+ ratio. Finally, a mechanism of NO catalytic oxidation on MLAC based on NO adsorption-desorption and MnOx lattice O transfer is proposed. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码:387 / 397
页数:11
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