Cerium Manganese Oxides Coupled with Zsm-5 : A Novel Scr Catalyst with Superior K Resistance
The application of cerium-manganese oxides (CeMn) in controlling exhaust gas from biomass combustion is greatly inhibited due to poor resistance to alkali metals. Herein, we report a smart strategy to circumvent the K poisoning problem of CeMn by physically coupling with ZSM-5, which exhibited almost no activity loss even under a high loading of 2 wt. % K 2 O. Results showed that in contrast to the conventionally believed disturbance of redox property and reduction of acid sites, the dominant effect from K loading on the deactivation of CeMn catalysts lies on the formation of chemically inert nitrates, which significantly restrains the reaction cycle via Langmuir-Hinshelwood route. With ZSM-5 hybridization, the stable nitrates over CeMn can be facilely activated and consumed by NH 4 + species introduced by ZSM-5, thus transforming poisoning sites into active sites and ensuring superior catalytic performance. The study presenting here not only provides an efficient strategy for fabricating NH 3 -SCR catalysts with superior K resistance but also sheds new light on the deactivation mechanism of K over CeMn catalysts
Year of publication: |
[2022]
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Authors: | Ji, Jiawei ; Tang, Yu ; Han, Li ; Ran, Pan ; Song, Wang ; Cai, Yandi ; Tan, Wei ; Sun, Jingfang ; Tang, Changjin ; Dong, Lin |
Publisher: |
[S.l.] : SSRN |
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