Cerium doped copper/ZSM-5 catalysts used for the selective catalytic reduction of nitrogen oxide with ammonia

Dou, Baojuan, Lv, Gang, Wang, Chang, Hao, Qinglan and Hui, KwanSan ORCID: https://orcid.org/0000-0001-7089-7587 (2015) Cerium doped copper/ZSM-5 catalysts used for the selective catalytic reduction of nitrogen oxide with ammonia. Chemical Engineering Journal, 270. pp. 549-556. ISSN 1385-8947

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The CuCe/ZSM-5 catalysts with different cerium loadings (0, 0.5, 1.0, 1.5 and 2.0wt.%) was investigated to evaluate the correlation between structural characteristics and catalytic performance for the selective catalytic reduction (SCR) of NO by NH3. It was found that the addition of cerium increased copper dispersion and prevented its crystallization. According to the results of X-ray photoelectron spectroscopy (XPS) and temperature-programmed reduction by hydrogen (H2-TPR), copper species were enriched on the ZSM-5 grain surfaces and part of copper ions was incorporated into the cerium lattice. Addition of cerium improved the redox properties of the CuCe/ZSM-5 catalysts, owing to the higher valence of copper and mobility of lattice oxygen than those of Cu/ZSM-5 catalyst. Hence the introduction of cerium in Cu/ZSM-5 improved significantly NO conversion. On the one hand, the cerium introduction into Cu-Z enhances their low-temperature activities. 95% NO conversion is reached around 197°C for Cu-Z while the corresponding temperature value decreases to 148°C for CuCe4-Z. On the other hand, the temperature range of efficient NO reduction (95%) also extends to higher temperature when the cerium are added to Cu/ZSM-5. Among the Cu-Ce/ZSM-5 catalysts tested, the CuCe4-Z sample exhibits the highest catalytic activity with the temperature range for 90% NO removal of 148-427°C.

Item Type: Article
Uncontrolled Keywords: ammonia,zsm-5 catalyst,nitrogen oxide,selective catalytic reduction
Faculty \ School: Faculty of Science > School of Engineering
University of East Anglia Research Groups/Centres > Theme - ClimateUEA
UEA Research Groups: Faculty of Science > Research Groups > Energy Materials Laboratory
Faculty of Science > Research Groups > Emerging Technologies for Electric Vehicles (EV)
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Depositing User: Pure Connector
Date Deposited: 29 Sep 2017 05:06
Last Modified: 20 Apr 2023 00:35
URI: https://ueaeprints.uea.ac.uk/id/eprint/64993
DOI: 10.1016/j.cej.2015.02.004

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