Mechanistic investigation of NH3 oxidation over V-0.5Ce(SO4)2/Ti NH3-SCR catalyst

被引：18

作者：

Hu, Wenshuo ^{[1
]}

Zhang, Shuo ^{[1
]}

Xin, Qi ^{[1
]}

Zou, Renzhi ^{[1
]}

Zheng, Chenghang ^{[1
]}

Gao, Xiang ^{[1
]}

Cen, Kefa ^{[1
]}

机构：

[1] Zhejiang Univ, State Key Lab Clean Energy Utilizat, 38 Zheda Rd, Hangzhou 310027, Zhejiang, Peoples R China

来源：

CATALYSIS COMMUNICATIONS | 2018年 / 112卷

关键词：

NH3; oxidation; NH imido intermediate; Ammonia dehydrogenation mechanism; AMMONIA OXIDATION; V2O5/TIO2; CATALYSTS; MOLECULAR-STRUCTURE; OXIDE CATALYSTS; REDUCTION; NO; REACTIVITY; SCR; RESISTANCE; H2O;

D O I：

10.1016/j.catcom.2018.04.010

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：

NH3 oxidation over V-0.5Ce(SO4)(2)/Ti catalyst used for NH3-SCR was investigated and compared to that occurred over a commercial V-W/Ti catalyst. It was found that much more significant NH3 oxidation into N-2 and N2O occurs over V-0.5Ce(SO4)(2)/Ti than commercial V-W/T-i catalyst at high temperatures (> 300 degrees C). According to the kinetics and characterization results obtained, stronger surface redox properties and a relatively higher concentration of polymerized vanadates present on V-0.5Ce(SO4)(2)/Ti should contribute to its higher NH3 conversion values. In-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) studies suggested the formation of -NH imido species, based on which a successive NH3 dehydrogenation-like mechanism is proposed, which consistently explains well the experimental observations.

引用

页码：1 / 4

页数：4

共 19 条

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