Selectivity considerations in methane catalytic combustion

被引:0
|
作者
Betta, RAD
Loffler, DG
机构
来源
HETEROGENEOUS HYDROCARBON OXIDATION | 1996年 / 638卷
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暂无
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
In the catalytic combustion of methane, both the catalytic reactions and the downstream radical combustion processes can influence the selectivity to CO and CO2, Assuming CH4 is oxidized to CO2 via a CO intermediate, the CO level exiting a supported palladium monolithic catalyst was modeled assuming that the CO was a gas phase intermediate and using literature kinetics for both CH4 and CO surface reaction rates. The. model predicts a CO selectivity independent of the methane oxidation rate and CO levels in the range of 1 to 6 ppm. This agrees with experimental measurements that showed levels of 5 to 8 ppm at practical gas turbine conditions. The radical reaction process just downstream of the catalyst was also explored using a kinetic reaction sequence that describes the homogeneous radical combustion of CH4. To achieve CO levels in the range of 10 ppm in a reaction time adequate for use in a gas turbine combustor, reaction temperatures above 1100 degrees C are required.
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页码:36 / 47
页数:12
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