Adsorption and oxidation of NH3 over V2O5/AC surface

被引：81
作者：
Sun, Dekui [1 ,2 ]
Liu, Qingya [3 ]
Liu, Zhenyu [1 ,3 ]
Gui, Guoqing [1 ]
Huang, Zhanggen [1 ]
机构：
[1] Chinese Acad Sci, Inst Coal Chem, State Key Lab Coal Convers, Taiyuan 030001, Peoples R China
[2] Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China
[3] Beijing Univ Chem Technol, State Key Lab Chem Resource Engn, Beijing 100029, Peoples R China
来源：
APPLIED CATALYSIS B-ENVIRONMENTAL | 2009年 / 92卷 / 3-4期
基金：
国家高技术研究发展计划(863计划);
关键词：
V2O5/AC; SCR reaction; NH3; adsorption; Oxidation; NO; SELECTIVE CATALYTIC-REDUCTION; LOW-TEMPERATURE SCR; NO REDUCTION; VANADIA-TITANIA; NITRIC-OXIDE; FT-IR; CARBON; AMMONIA; SO2; BEHAVIOR;
D O I：
10.1016/j.apcatb.2009.09.005
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：
V2O5/AC has been reported to be active for selective catalytic reduction (SCR) of NO with NH3 at around 200 degrees C and resistant to SO2 deactivation. To elucidate its SCR mechanism, adsorption and oxidation of NH3 over V2O5/AC are studied in this paper using TG, MS and DRIFTS techniques. It is found that the adsorption and oxidation of NH3 take place mainly at V=O bond of V2O5. A higher V2O5 loading results in more NH3 adsorption on the catalyst. V2O5 contains both Bronsted and Lewis acid sites; NH4+ on Bronsted acid sites is less stable and easier to be oxidized than NH3 on Lewis acid sites. Gaseous O-2 promotes interaction of NH3 with AC and oxidation of NH3 over V2O5/AC. NH3 is oxidized into NH2 and acylamide structures and then to isocyanate species, which is an intermediate for N-2 formation. (C) 2009 Elsevier B.V. All rights reserved.
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收藏
页码：462 / 467
页数：6
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