The promoting mechanism of Ce on the hydrothermal stability of Fe-Beta catalyst for NH3-SCR reaction
نویسندگان
چکیده
The experiment of Fe-Beta catalysts modified by Ce with incipient wetness impregnation methods was carried out for the selective catalytic reduction NOx NH3. characteristics catalyst before and after hydrothermal treatment were evaluated changes active sites, acid sites pore structure. results showed that conversion from [Fe2+-OX]+ to [HO-Fe3+-OX]+ during reaction aging promoted gradual dehydroxylation condensation generate larger FexOy particles. However, introduction slowed down this trend, [(HO)2-Ce-OX]+ competed each other in process would not form longer cluster species. adsorption activation species more nitrate chelated bidentate nitrate, then improved formation NH4NO3, which remarkably enhance activity Ce-Fe-Beta aging.
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ژورنال
عنوان ژورنال: Microporous and Mesoporous Materials
سال: 2022
ISSN: ['1873-3093', '1387-1811']
DOI: https://doi.org/10.1016/j.micromeso.2022.111937