Relationship between the molecular structure of V2O5/TiO2 catalysts and the reactivity of SO2 oxidation

被引：66

作者：

Ji, Peidong ^{[1
]}

Gao, Xiang ^{[1
]}

Du, Xuesen ^{[1
,2
]}

Zheng, Chenghang ^{[2
]}

Luo, Zhongyang ^{[1
]}

Cen, Kefa ^{[1
]}

机构：

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

[2] Chongqing Univ, Coll Power Engn, Minist Educ China, Key Lab Low Grade Energy Utilizat Technol & Syst, Chongqing 400044, Peoples R China

来源：

CATALYSIS SCIENCE & TECHNOLOGY | 2016年 / 6卷 / 04期

基金：

美国国家科学基金会;

关键词：

VANADIA-TITANIA CATALYSTS; SULFUR-DIOXIDE; SUPPORTED VANADIA; OXIDE CATALYSTS; NITRIC-OXIDE; REDUCTION; NO; ADSORPTION; MONOLAYER; NH3;

D O I：

10.1039/c5cy00867k

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：

The relationship between the molecular structure of V2O5/TiO2 catalysts and the reactivity of SO2 oxidation was investigated. The dispersion state and surface properties of supported vanadia over V2O5/TiO2 catalysts were studied with various experimental techniques. Isolated vanadia species were dispersed on the TiO2 surface as Ti-O-V bonds at VOx coverage far below the monolayer. Polymeric vanadia species were then formed through the V-O-V bonds as the VOx coverage increased. SO2 temperature-programmed desorption and in situ diffuse reflectance infrared Fourier transform spectroscopy were conducted to study the interaction between SO2 and V2O5/TiO2. On the V2O5/TiO2 catalysts, the turnover frequency of SO2 oxidation was almost constant with increased VOx coverage under the condition of constant temperature. V=O was demonstrated to play a critical role in the SO2 adsorption and oxidation. A possible reaction mechanism was established in this study.

引用

页码：1187 / 1194

页数：8

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