Journal
TOPICS IN CATALYSIS
Volume 59, Issue 10-12, Pages 919-924Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s11244-016-0569-z
Keywords
SCR; NO oxidation; NH3 oxidation; Combined catalysts; Ceria-zirconia; H-Beta
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NH3-SCR performance of the combined catalyst (CombiCats) prepared by mechanical mixing of CeO2-ZrO2 and H-Beta is studied in details. It was shown, that individual standard SCR activities of CeO2-ZrO2 and H-Beta are negligible, while their mixing results in the significant improvement of NOx conversion. The absence of standard SCR activity of individual components enabled us to estimate the contribution of fast SCR, NO and NH3 oxidation reactions to the overall process on CombiCat. Comparison of catalytic data obtained for layered configurations and CombiCats with various CeO2-ZrO2/ H-Beta ratios also allowed us to determine the rate-limiting step and role of each component in the process.
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