首页|Hydrothermally stable metal oxide-zeolite composite catalysts for low-temperature NOx reduction with improved N2 selectivity

Hydrothermally stable metal oxide-zeolite composite catalysts for low-temperature NOx reduction with improved N2 selectivity

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Development of hydrothermally stable,low-temperature catalysts for controlling nitrogen oxides emis-sions from mobile sources remains an urgent challenge.We have prepared a metal oxide-zeolite compos-ite catalyst by depositing Mn active species on a mixture support of CeO2/Al2O3 and ZSM-5.This compos-ite catalyst is hydrothermally stable and shows improved low-temperature SCR activity and significantly reduced N2O formation than the corresponding metal oxide catalyst.Comparing with a Cu-CHA catalyst,the composite catalyst has a faster response to NH3 injection and less NH3 slip.Our characterization re-sults reveal that such an oxide-zeolite composite catalyst contains more acidic sites and Mn3+species as a result of oxide-zeolite interaction,and this interaction leads to the generation of more NH4+species bound to the Brønsted acid sites and more reactive NOx species absorbed on the Mn sites.Herein,we report our mechanistic understanding of the oxide-zeolite composite catalyst and its molecular pathway for improving the low-temperature activity and N2 selectivity for NH3-SCR reaction.Practically,this work may provide an alternative methodology for low-temperature NOx control from diesel vehicles.

Selective catalytic reductionMn-based catalystsHydrothermal stabilityN2 selectivity

Lijun Yan、Shiqi Chen、Penglu Wang、Xiangyu Liu、Lupeng Han、Tingting Yan、Yuejin Li、Dengsong Zhang

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School of Environmental and Chemical Engineering,International Joint Laboratory of Catalytic Chemistry,College of Sciences,Shanghai University,Shanghai 200444,China

BASF Environmental Catalyst and Metal Solutions,Iselin,NJ 08830,United States

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaChenguang Program Shanghai Education Development Foundation and Shanghai Municipal Education Commission

21976117221256042227611921CGA48

2024

10.1016/j.cclet.2023.109132

中国化学快报(英文版)
中国化学会

中国化学快报(英文版)

CSTPCD
影响因子：0.771
ISSN：1001-8417
年,卷(期)：2024.35(6)
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