The surface properties and the activities in catalytic wet air oxidation over CeO2-TiO2 catalysts

被引：271

作者：

Yang, Shaoxia ^{[1
]}

Zhu, Wanpeng ^{[1
]}

Jiang, Zhanpeng ^{[1
]}

Chen, Zhengxiong ^{[1
]}

Wang, Jiangbing ^{[1
]}

机构：

[1] Tsinghua Univ, Dept Environm Sci & Engn, Beijing 100084, Peoples R China

来源：

APPLIED SURFACE SCIENCE | 2006年 / 252卷 / 24期

基金：

中国博士后科学基金;

关键词：

catalytic wet air oxidation (CWAO); CeO2; TiO2; acetic acid;

D O I：

10.1016/j.apsusc.2005.11.067

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：

No-noble metal CeO2-TiO2 catalysts prepared by sol-gel method were developed and examined for catalytic wet air oxidation (CWAO) of acetic acid. The structure of the catalysts was measured by BET, SEM, XRD, XPS and DTA-TG. We investigated the effect of the interactions of Ce and Ti on the structure of CeO2-TiO2 catalysts. The mechanisms of the relationships between the different content of Ti and the activity of CeO2-TiO2 catalysts were discussed. The results showed that the average crystal size of CeO2, decreased and the surface areas increased; the low valence of Ce3+ increase, and the chemisorbed oxygen slightly decreased with the increase of Ti content on the surface of CeO2-TiO2 catalysts. The order of the activity in CWAO of acetic acid followed: Ce/Ti 1/1 > Ce/Ti 3/1 > Ce/Ti 1/3 > Ce/Ti 511 > CeO2 > TiO2 > no catalyst. In CWAO of acetic acid, the optimal atomic ratio of Ce and Ti was 1, and the highest COD removal was over 64% at 230 degrees C, 5 MPa and 180 min reaction time over Ce/Ti 1/1 catalyst. The excellent activity and stability of CeO2-TiO2 catalysts was observed in our study. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：8499 / 8505

页数：7

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