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Improvement of Alkali Metal Resistance for $NH_{3}$-SCR Catalyst Cu/SSZ-13: Tune the Crystal Size
Content Provider | MDPI |
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Author | Chen, Zexiang Shen, Meiqing Wang, Chen Wang, Jianqiang Wang, Jun Shen, Gurong |
Copyright Year | 2021 |
Description | To improve the alkali metal resistance of commercial catalyst Cu/SSZ-13 for ammonia selective catalytic reduction $(NH_{3}$-SCR) reaction, a simple method to synthesize Cu/SSZ-13 with a core–shell like structure was developed. Compared with smaller-sized counterparts, Cu/SSZ-13 with a crystal size of 2.3 μm exhibited excellent resistance to Na poisoning. To reveal the influence of the crystal size on Cu/SSZ-13, physical structure characterization (XRD, BET, SEM, NMR) and chemical acidic distribution $(H_{2}$-TPR, UV-Vis, Diethylamine-TPD, pyridine-DRIFTs, EDS) were investigated. It was found that the larger the crystal size of the molecular sieve, the more Cu is distributed in the crystal core, and the less likely it was to be replaced by Na to generate CuO. Therefore, a 2.3 μm sized Cu/SSZ-13 well-controlled the reactivity of the side reaction $NH_{3}$ oxidation and the generation of $N_{2}$O. The result was helpful to guide the extension of the service life of Cu/SSZ-13. |
Starting Page | 979 |
e-ISSN | 20734344 |
DOI | 10.3390/catal11080979 |
Journal | Catalysts |
Issue Number | 8 |
Volume Number | 11 |
Language | English |
Publisher | MDPI |
Publisher Date | 2021-08-16 |
Access Restriction | Open |
Subject Keyword | Catalysts Environmental Engineering Alkali Metal Poison Cu/ssz-13 Crystal Size Nh3-scr |
Content Type | Text |
Resource Type | Article |