期刊
TOPICS IN CATALYSIS
卷 39, 期 1-2, 页码 45-52出版社
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s11244-006-0036-3
关键词
SSITKA; kinetic analysis; NO selective reduction by CH4; ZSM-5
The surface coverage analysis derived from two formal steady-state kinetic models is compared to values directly obtained from steady-state isotopic transient analysis (SSITKA) for the selective catalytic reduction (SCR) of NO by CH4 over Co-ZSM-5 catalysts. It is shown that the most abundant reacting intermediates are NO (x) adspecies, though no clear differentiation between the various adspecies identified by DRIFT spectroscopy was achieved. Less numerous carbon containing adspecies were identified and quantified in the reacting system, essentially as methoxy species. Nitromethane-like intermediates remained undetectable due to a very rapid transformation into N-2 and CO2. On the basis of these converging kinetic analyses related to each elementary step of the SCR process, a microkinetic model can be derived, which allows describing transient operation, in view of a non steady-state application.
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