A novel ceria-activated carbon composite for the catalytic ozonation of carboxylic acids

被引：105

作者：

Faria, P. C. C. ^{[1
]}

Orfao, J. J. M. ^{[1
]}

Pereira, M. F. R. ^{[1
]}

机构：

[1] Univ Porto, Lab Catalise & Mat, Dept Engn Quim, Fac Engn, P-4200465 Oporto, Portugal

来源：

CATALYSIS COMMUNICATIONS | 2008年 / 9卷 / 11-12期

关键词：

catalytic ozonation; activated carbon; cerium oxide; carboxylic acids; oxamic acid; oxalic acid;

D O I：

10.1016/j.catcom.2008.04.009

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：

Ceria (Ce-O) and a novel ceria-activated carbon composite (ACO-Ce-O) were prepared and tested as catalysts in the ozonation of two selected carboxylic acids, oxalic acid and oxamic acid, at acid pH. Ce-O showed an interesting catalytic effect, especially in the ozonation of oxalic acid. A strong synergic effect was observed for the ACO-Ce-O composite in the case of oxalic acid, leading to the best results in the mineralization of this compound. Both materials enhanced the removal of oxamic acid relatively to single ozonation. The Ce-O catalytic ozonation was shown to comprise bulk oxidation reactions occurring via HO center dot radicals. In the case of the composite, both surface and bulk reactions are supposed to occur. Some considerations about the mechanisms are presented. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：2121 / 2126

页数：6

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