Journal
JOURNAL OF CATALYSIS
Volume 311, Issue -, Pages 447-457Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2013.12.012
Keywords
NOx reduction; NH3/SCR; CuSSZ13; Hydrothermal stability; ESR
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Funding
- National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology (MEST) (Emission Control Catalytic System for Next Generation Energy-Efficient Vehicle) [2013063241]
- Ministry of Education, Science and Technology (MEST) (Center for Ordered Nanoporous Materials Synthesis) [2012R1A3A2048833]
- National Research Foundation of Korea [2009-0092793, 2012R1A3A2048833] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The hydrothermal stability of CuSSZ13 catalysts with respect to their Cu/Al ratio has been investigated to understand the deactivation mechanism of their catalytic activity for NO reduction by NH3/SCR. The decline of the deNOx activity due to the hydrothermal aging became more severe as the Cu/Al ratio increased. Results of ESR, H-2-TPR and DRIFT studies indicated that the D6R sites are occupied first by Cu2+ ions (alpha species) up to their accommodation capacity, followed by the occupation of the CHA sites (beta species) with the increase in the Cu/Al ratio. The beta species agglomerate more readily than alpha species due to their less stable nature, leading to the formation of CuOx. The CuOx may grow to destroy the zeolite cage and channel, resulting in the collapse of the SSZ13 structure, which is believed to be the primary cause for the hydrothermal deactivation of the CuSSZ13 catalyst. (C) 2014 Elsevier Inc. All rights reserved.
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