Frontiers of Environmental Science & Engineering
>> 2018,
Volume 12,
Issue 1
doi:
10.1007/s11783-018-1012-4
RESEARCH ARTICLE
Effect of alumina and zirconia as binders on the activity of Fe-BEA for NH
. Research Center for Combustion and Environment Technology, Shanghai Jiao Tong University, Shanghai 200240, China.. School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.. Hirano Institute for Materials Innovation, Shanghai Jiao Tong University, Shanghai 200240, China
Available online: 2017-12-05
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Abstract
Fe-BEA catalysts are active for the NH -SCR of NO. For industrial application, a binder should be added to the Fe-BEA catalysts to make them tightly adhere to the monoliths. The addition of alumina and zirconia as binders to the Fe-BEA led to a different effect on NO conversion. The catalytic activity of the mixed samples was evaluated by the temperature programmed procedure in a flow-reactor system, and the mechanism was analyzed via SEM, BET, XRD and XPS. It was found that larger iron particles were formed by the migration of parent iron particles in the Fe-BEA catalyst with alumina. This led to the increase of Fe magnitude and iron cluster, enhancing the abilities of NO oxidation and storage. Accordingly, the SCR activity increased slightly in low temperature but decreased sharply in high temperature. For the Fe-BEA with zirconia sample, NO oxidation and storage abilities decreased due to the less iron clusters. The increase of Fe magnitude resulted in higher catalytic oxidation ability, which gave rise to little change in the SCR activity compared with the Fe-BEA.
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