Adsorption and oxidation of NH3 over V2O5/AC surface

被引:83
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
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.
引用
收藏
页码:462 / 467
页数:6
相关论文
共 37 条
[11]   DRIFTS investigation of V=O behavior and its relations with the reactivity of ammonia oxidation and selective catalytic reduction of NO over V2O5 catalyst [J].
Jung, SM ;
Grange, P .
APPLIED CATALYSIS B-ENVIRONMENTAL, 2002, 36 (04) :325-332
[12]   An FT-IR study of the adsorption of urea and ammonia over V2O5-MoO3-TiO2SCR catalysts [J].
Larrubia, MA ;
Ramis, G ;
Busca, G .
APPLIED CATALYSIS B-ENVIRONMENTAL, 2000, 27 (03) :L145-L151
[13]   Vanadium loaded carbon-based catalysts for the reduction of nitric oxide [J].
Lazaro, M. J. ;
Galvez, M. E. ;
Ruiz, C. ;
Juan, R. ;
Moliner, R. .
APPLIED CATALYSIS B-ENVIRONMENTAL, 2006, 68 (3-4) :130-138
[14]   SURFACE AND CATALYTIC PROPERTIES OF VANADIA-TITANIA AND TUNGSTA-TITANIA SYSTEMS IN THE SELECTIVE CATALYTIC REDUCTION OF NITROGEN-OXIDES [J].
LIETTI, L ;
SVACHULA, J ;
FORZATTI, P ;
BUSCA, G ;
RAMIS, G ;
BREGANI, F .
CATALYSIS TODAY, 1993, 17 (1-2) :131-139
[15]   POTASSIUM DOPING OF VANADIA/TITANIA DE-NO(X)ING CATALYSTS - SURFACE CHARACTERIZATION AND REACTIVITY STUDY [J].
LIETTI, L ;
FORZATTI, P ;
RAMIS, G ;
BUSCA, G ;
BREGANI, F .
APPLIED CATALYSIS B-ENVIRONMENTAL, 1993, 3 (01) :13-35
[16]   Adsorption behavior of moisture over a vanadia/titania catalyst: A study for the selective catalytic reduction process [J].
Lin, CH ;
Bai, H .
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 2004, 43 (19) :5983-5988
[17]   Adsorption and activation of NH3 during selective catalytic reduction of NO by NH3 [J].
Liu Qingya ;
Liu Zhenyu ;
Li Chengyue .
CHINESE JOURNAL OF CATALYSIS, 2006, 27 (07) :636-646
[18]   Mechanism of low-temperature selective catalytic reduction of NO with NH3 over carbon-supported Mn3O4 -: Role of surface NH3 species:: SCR mechanism [J].
Marbán, G ;
Valdés-Solís, T ;
Fuertes, AB .
JOURNAL OF CATALYSIS, 2004, 226 (01) :138-155
[19]   Removal of SOx and NOx over activated carbon fibers [J].
Mochida, I ;
Korai, Y ;
Shirahama, M ;
Kawano, S ;
Hada, T ;
Seo, Y ;
Yoshikawa, M ;
Yasutake, A .
CARBON, 2000, 38 (02) :227-239
[20]   Low temperature selective catalytic reduction of NO over modified activated carbon fibres [J].
Muñiz, J ;
Marbán, G ;
Fuertes, AB .
APPLIED CATALYSIS B-ENVIRONMENTAL, 2000, 27 (01) :27-36