Fuel combustion reactions and catalysts: XXI. Synthesis and characterization of modified Mn-Al-O catalysts for high-temperature oxidation

被引：4

作者：

Tsykoza, LT ^{[1
]}

Ismagilov, ZR ^{[1
]}

Ushakov, VA ^{[1
]}

Kuznetsov, VV ^{[1
]}

Ovsyannikova, IA ^{[1
]}

机构：

[1] Russian Acad Sci, Siberian Div, Boreskov Inst Catalysis, Novosibirsk 630090, Russia

来源：

KINETICS AND CATALYSIS | 2003年 / 44卷 / 06期

关键词：

Combustion; Manganese; Solid Solution; Calcination; Calcination Temperature;

D O I：

10.1023/B:KICA.0000009058.43038.94

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 phase composition of supported Mn-Al-O catalysts and their activity in the reaction of methane oxidation were studied depending on the composition of aluminum oxide supports (gamma-Al2O3 with different chi-Al2O3 contents modified with individual Mg, La, and Cc oxides or Mg + La and Mg + Ce oxide mixtures) and calcination temperatures (500, 900, and 1300 C). It was found that the Mn-Al-O catalysts based on gamma-alumina containing chi-Al2O3 and modified with Mg, La, or Cc additives are more active and thermally stable (up to 1300degreesC) than the samples based on pure gamma-Al2O3. A conclusion was drawn that a higher degree of disorder of the structure of chi-Al2O3, compared to that of gamma-Al2O3, is favorable for a deeper interaction of manganese and modifying additives with the support at the early stages of the synthesis and for the formation of Mn-Al compounds with complex composition (solid solutions and/or hexaaluminates) at 1300degreesC. These compounds are responsible for the stability and high activity of the catalysts in methane oxidation.

引用

页码：806 / 812

页数：7

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