Kinetic study of photo-SCR with NH3 over TiO2

被引：63

作者：

Teramura, K ^{[1
]}

Tanaka, T ^{[1
]}

Yamazoe, S ^{[1
]}

Arakaki, K ^{[1
]}

Funabiki, T ^{[1
]}

机构：

[1] Kyoto Univ, Grad Sch Engn, Dept Mol Engn, Kyoto 6158510, Japan

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2004年 / 53卷 / 01期

关键词：

photo-SCR; Eley-Rideal mechanism; Lewis acid site;

D O I：

10.1016/j.apcatb.2004.05.005

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：

83% of NO conversion and 96% of N-2 selectivity were achieved in the photo-SCR system over TiO2 photocatalyst. N-2 was evolved in the gas phase when NO was flowed over TiO2 pretreated by NH3 under photoirradiation. The photo-SCR reaction proceeds according to Eley-Rideal mechanism. NO in the gas phase attacks NH3 adsorbed on Lewis acid site. Strength and/or amount of the Lewis acid site related to NH3 adsorption had an influence on the N-2 evolution. Therefore, the surface acid property of TiO2 is an important factor to control the N-2 evolution. In addition, the reaction orders of gases (NO, NH3 and O-2) and light intensity were determined by the kinetic studies. The results supported the reaction mechanism which we have proposed in the previous works. Time-determining step of the photo-SCR over TiO2 is the process of decomposition of a NH2NO intermediate under excess O-2 concentration or re-oxidation of Ti3+ to Ti4+ below 2% O-2 concentration. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：29 / 36

页数：8

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