Catalytic Reduction of NO by NH over Fe-zeolite Catalysts with Different Topologies
Catalysis Letters, ISSN: 1572-879X, Vol: 154, Issue: 7, Page: 3947-3957
2024
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Article Description
To reveal the effect of zeolite topology on the status of iron species, a series of Fe-zeolite catalysts (Fe-Beta, Fe-ZSM-5, Fe-Y, Fe-ZSM-35, Fe-MCM-22, Fe-SSZ-13) were synthesized using the wet ion-exchange technique. The catalytic reduction of NO by NH with Fe-zeolites was carried out, and the corresponding activities followed the order Fe-Beta > Fe-ZSM-5 > Fe-Y > Fe-ZSM-35 > Fe-MCM-22 > Fe-SSZ-13. The Fe-Beta catalyst shows the best activity, which achieving more than 98% NO conversion at 350 ℃. The prepared catalysts were subjected to physicochemical characterization. It shows that the structure of Fe-Beta and Fe-ZSM-5 zeolite facilitated the loading of Fe ions upon the framework of zeolites through the pores and the sequent formation of active centers (Fe) on the ion exchange sites. In addition, the larger pore sizes in Fe-zeolites are more favorable for the diffusion of NO within the pores and channels of the zeolite, so the catalytic reduction of NO by ammonia is promoted. Graphical Abstract: (Figure presented.)
Bibliographic Details
Springer Science and Business Media LLC
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