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Water: A promoter of ammonia selective catalytic reduction over copper-exchanged LTA zeolites

Title
Water: A promoter of ammonia selective catalytic reduction over copper-exchanged LTA zeolites
Authors
YANG, LIUXue W.SEO, SEUNGWANGXUECHAO, TANMei D.Liu C.-J.NAM, IN SIKHong S.B.
Date Issued
2021-10
Publisher
Elsevier BV
Abstract
Negative effects of water on the hydrothermal stability of ammonia (NH3) selective catalytic reduction (SCR) catalysts are well known. Thus, developing water-resistant, zeolite-based transition metal catalysts like copper (Cu) for mitigating nitrogen oxides from mobile sources is very challenging. Here we show that water markedly facilitates the migration of copper ions from sterically inaccessible sod cage to the readily accessible lta one through six-membered rings within a copper-exchanged high-silica Cu-LTA zeolite. We also show that this ubiquitous molecule promotes the low-temperature SCR activity of the Cu-LTA catalyst with a plausible reaction [H2O-Cu-NH3]+ intermediate. We anticipate that water might play a beneficial role in nitrogen oxides removal over metal-containing zeolites for cleaner air via tuning the active sites and reaction pathways.
URI
https://oasis.postech.ac.kr/handle/2014.oak/106584
ISSN
0926-3373
Article Type
Article
Citation
Applied Catalysis B: Environmental, vol. 294, 2021-10
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홍석봉HONG, SUK BONG
Div of Environmental Science & Enginrg
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