Journal
CHEMICAL ENGINEERING SCIENCE
Volume 203, Issue -, Pages 28-42Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2019.03.028
Keywords
C4H10-selective catalytic reduction; de-NOx; Cu/zeolite; Chabazite; ZSM-5; BETA
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Funding
- Sasamura Foundation for the Promotion of Engineering of Japan
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Korea Ministry of Science, ICT & Future Planning (MSIP) [NRF-2015R1A4A1041746]
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The catalytic activity of Cu/zeolites with different types of zeolite frameworks (SSZ-13, ZSM-5, and BETA) was investigated in the selective catalytic reduction of NOx with n-C4H10. The Cu content and zeolite framework significantly affected the catalytic performance in the C4H10-SCR process, where the lowCu-impregnated medium-pore ZSM-5 structure (2Cu/ZSM-5) exhibited the optimal de-NOx performance, followed by the high- and medium Cu-impregnated large- and small-pore BETA and SSZ-13 zeolites (10Cu/BETA and 5Cu/SSZ-13), respectively. The effects of coexistent gases (CO(2 )and O-2) and hydrothermal aging were also evaluated for 2Cu/ZSM-5. CO2 in the feed gas induced an unfavorable effect on NOx reduction because it competed with NO and C4H10 adsorption on the catalyst surface. O-2 in the feed gas had a positive effect on NOx conversion, CO oxidation, and partial oxidation of C4H10, and N-2 selectivity was highly affected by the O-2 concentration, producing a large amount of NH3 in the absence of O-2. The deactivation of the catalytic activity after hydrothermal aging was attributed to collapse of the pore structures and a drop in the zeolite crystallinity. However, there was no catalytic deactivation due to the coke formation by hydrocarbons within 24 h in the steady-state stability test. (C) 2019 Elsevier Ltd. All rights reserved.
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