Catalytic wet air oxidation of stearic acid on cerium oxide supported noble metal catalysts

被引：42

作者：

Renard, B

Barbier-Jr, J

Duprez, D

Durécu, S

机构：

[1] CNRS, UMr 6503, LACCO, Catalyse Chim Organ Lab, F-86022 Poitiers, France

[2] Univ Poitiers, F-86022 Poitiers, France

[3] TREDI, Dept Rech, F-54505 Vandoeuvre Les Nancy, France

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2005年 / 55卷 / 01期

关键词：

catalytic wet air oxidation; stearic acid; acetic acid; fatty acids; ruthenium; platinum; cerium oxide;

D O I：

10.1016/j.apcatb.2004.06.017

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：

Catalytic wet air oxidation (CWAO) of stearic acid was carried out in a batch reactor over noble metals (Ru, Pd, Pt, Ir) catalysts supported on ceria. The influence of reaction conditions such as temperature, oxygen pressure and stearic acid concentration were investigated. The reaction occurs via a complex mechanism. The molecule of stearic acid can be oxidized by successive carboxy-decarboxylation (R-n-COOH + O-2 --> Rn-1-COOH +CO2) yielding essentially CO2 (route A). It may also be oxidized after C-C bond rupture within the alkyl chain, which gives rise to significant amounts of acetic acid besides CO2 (route B). Pt/CeO2 is a very active catalyst in the conversion of stearic acid and extremely selective to carbon dioxide (route A), while the mechanism via C-C bond splitting is much more marked on Ru/CeO2. The catalyst characterization indicates that both noble metal and CeO2 particles remain stable during the reaction. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：1 / 10

页数：10

共 26 条

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