Synthesis and characterization of manganese oxides employed in VOCs abatement

被引：85

作者：

Lamaita, L ^{[1
]}

Peluso, MA ^{[1
]}

Sambeth, JE ^{[1
]}

Thomas, HJ ^{[1
]}

机构：

[1] Natl Univ La Plata, CONICET, Ctr Invest & Desarrollo Ciencias Aplicadas, CINDECA Dr Jorge J Ronco, RA-1900 La Plata, BA, Argentina

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2005年 / 61卷 / 1-2期

关键词：

gamma-MnO2; nsutite; manganese oxides; DRIFTS; ethanol oxidation; VOCs;

D O I：

10.1016/j.apcatb.2005.03.014

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：

Two MnO2 were prepared by different methods: (i) MnCO3 decomposition; and (ii) oxidation of acid MnSO4 solution. The combined use of X-ray diffraction (XRD), DRIFTS, DRS-UV-vis and TGA techniques revealed: (i) the presence of Mn4+-Mn3+; (ii) a poor crystallinity; and (iii) OH species at temperatures higher than 200 degrees C. The catalysts were tested in the complete oxidation of ethanol to carbon dioxide and water, and the reaction results showed that the catalytic activity of both samples were larger than MnO2 (pyrolusite, beta-MnO2) and Mn2O3 (like bixbyite) oxides. The high activity of the prepared oxides can be related to the simultaneous presence of Mn3+ and Mn4+ ions and OH- species generated by Mn4+ vacancies. In addition, in situ DRIFT spectroscopy demonstrated a different mechanism of adsorption-reaction of ethanol between the two synthesized manganese oxides. (c) 2005 Elsevier B.V All rights reserved.

引用

页码：114 / 119

页数：6

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