期刊
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
卷 71, 期 -, 页码 277-284出版社
ELSEVIER
DOI: 10.1016/j.jtice.2016.12.025
关键词
Phosphotungstic acid; Mechanism; Oxidation; Surface acidity
资金
- National Natural Science Foundation of China [21307047]
- Academic Newcomer Award of Yunnan Province [1319880226]
The mechanism of phosphotungstic acid modification CeO2 catalysts (P-WiCeO(2)) with different CeO2 supports were investigated by in situ diffuse reflectance infrared transform spectroscopy for the selective catalytic reduction of NO by NH3. The results indicated that the NH3-SCR reaction over P-WiCeO(2) followed both the Langmuir-Hinshelwood mechanism and the Eley-Rideal mechanism. The reaction between NH4+ and bidentate nitrate (NO3-) took place, and then the H2O, N-2 and adsorbed NO2 were formed. The coordinated NH3 species reacted with adsorbed NO2 and gaseous NO to generate N-2 and H2O The interaction between CeO2 and phosphotungstic acid contributed to the favored surface acidity (Lewis and Bronsted acid sites) and excellent redox property. The Bronsted acid sites facilitated the generation of NO2-adsorbed and Lewis acid sites accelerated the Eley-Rideal mechanism, while the NO oxidation to bidentate nitrate or NO2-adsorbed species was an important step in the reaction mechanism of P-WiCeO(2). (C) 2016 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据