Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.apcatb.2020.119756
Title: Differences in oxidation-reduction kinetics and mobility of Cu species in fresh and SO2-poisoned Cu-SSZ-13 catalysts
Authors: Vitaly V. Mesilov 
Susanna L. Bergman 
Sandra Dahlin
Yang Xiao
Shibo Xi
Ma Zhirui
Lian Xu
Wei Chen 
Lars J. Pettersson
Steven L. Bernasek 
Keywords: Cu-SSZ-13
LNT-SCR
SO2 poisoning
XAS
NAP-XPS
Issue Date: 27-Nov-2020
Publisher: Elsevier B.V.
Citation: Vitaly V. Mesilov, Susanna L. Bergman, Sandra Dahlin, Yang Xiao, Shibo Xi, Ma Zhirui, Lian Xu, Wei Chen, Lars J. Pettersson, Steven L. Bernasek (2020-11-27). Differences in oxidation-reduction kinetics and mobility of Cu species in fresh and SO2-poisoned Cu-SSZ-13 catalysts. Applied Catalysis B: Environmental : 119756. ScholarBank@NUS Repository. https://doi.org/10.1016/j.apcatb.2020.119756
Abstract: Fresh and SO2-poisoned Cu-SSZ-13 selective catalytic reduction (SCR) catalysts were studied using near-ambient pressure X-ray photoelectron spectroscopy (NAP-XPS) in the presence of NH3, O2, and NO, as well as by in situ X-ray absorption spectroscopy (XAS) using H2, He, and CO. In contrast to the fresh catalyst, inhibited reduction of Cu-species and the absence of Cu-metal nanoparticles was found in the SO2-poisoned catalyst during heating/cooling in H2 and CO. High structural disorder and differences in the formation of Cu-carbonyl species were seen for the SO2-poisoned catalyst compared to the fresh catalyst. Suppressed oxidation-reduction and low mobility of Cu-species during exposure to NH3-SCR-related gases were observed in the SO2-poisoned catalyst, unlike in the fresh catalyst. These observations help explain catalyst deactivation during the standard NH3-SCR reaction. The formation of Cu-metal nanoparticles in the fresh catalyst revealed another possible deactivation pathway for the SCR-catalyst in combined LNT-SCR systems during fuel-rich periods.
Source Title: Applied Catalysis B: Environmental
URI: https://scholarbank.nus.edu.sg/handle/10635/184945
ISSN: 0926-3373
DOI: 10.1016/j.apcatb.2020.119756
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