Effect of SO2 on the catalytic activity of SnO2 and CeO2 in methane oxidation

被引：3

作者：

Vishnyakov, A. V. ^{[1
]}

Rodina, K. V. ^{[1
]}

Chashchin, V. A. ^{[1
]}

机构：

[1] Mendeleev Univ Chem Technol Russia, Moscow 125047, Russia

来源：

KINETICS AND CATALYSIS | 2013年 / 54卷 / 03期

关键词：

COMBUSTION;

D O I：

10.1134/S0023158413030154

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 variation of the catalytic activity of tin and cerium dioxides in the combustion of SO2-containing methane has been investigated at SO2 concentrations of 50 to 1000 ppm in the gas stream. The catalytic activity of SnO2 decreases dramatically upon the introduction of SO2, but it returns rapidly to its initial level and then remains invariable (95% conversion, operating temperature of 600A degrees C). Cerium dioxide is much less resistant to poisoning with sulfur dioxide: the higher the SO2 concentration in the gas stream, the larger the decrease in its activity. After sulfur dioxide is cut off, CeO2 regains its initial activity at 750A degrees C. The behaviors of SnO2 and CeO2 are in agreement with the thermal stabilities of the corresponding sulfates and oxosulfates.

引用

页码：369 / 372

页数：4

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