Abstract
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 N2O by NH3 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% N2O 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 (Fe3+) on the ion exchange sites. In addition, the larger pore sizes in Fe-zeolites are more favorable for the diffusion of N2O within the pores and channels of the zeolite, so the catalytic reduction of N2O by ammonia is promoted.
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Funding
This work was funded by Innovation Fund of SINOPEC Catalyst Co. Ltd-State Key Laboratory of Chemical Resource Engineering (Grant no. 36100000-22-ZC0607-0041); National Natural Science Foundation of China (Grant nos. 21976012 and 22176010).
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Du, S., Kang, B., Guo, X. et al. Catalytic Reduction of N2O by NH3 over Fe-zeolite Catalysts with Different Topologies. Catal Lett (2024). https://doi.org/10.1007/s10562-024-04637-7
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DOI: https://doi.org/10.1007/s10562-024-04637-7