Journal
APPLIED SURFACE SCIENCE
Volume 436, Issue -, Pages 814-822Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2017.12.087
Keywords
Ce/TiO2 catalyst; SCR; Deactivation; P; K resistance
Categories
Funding
- Natural Science Foundation of China [21546014]
- Natural Science Foundation of Shanghai, China [14ZR1417800]
- Natural Science Foundation of China [21546014]
- Natural Science Foundation of Shanghai, China [14ZR1417800]
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The deactivation of SCR catalyst caused by K species contained in the fly ash would suppress its DeNOx performance. In this study, it was manifested that the modification of Ce/TiO2 catalyst with P could enhance its K tolerance. To understand the promotion mechanism, the fresh and poisoned catalyst samples were subjected to the characterization techniques including BET, XRD, XPS, H-2-TPR, NH3-TPD and in situ DRIFT. The results elucidated that the introduction of P species could increase the reducibility of Ce species and generate more surface chemisorbed oxygen, along with the strengthened surface acidity for NH3 adsorption. It seemed that the NH3-SCR reaction mechanism over Ce/TiO2 catalyst was a combination of L-H mechanism (<200 degrees C) and E-R mechanism (>= 200 degrees C). After the addition of P species, the NO oxidation over Ce/TiO2 catalyst was also accelerated, accompanied by the broadened temperature window for the NH3-SCR reaction under the control of L-H mechanism. The promoted NH3 species adsorption and the generated more NO2 over P-Ce/TiO2 catalyst were conducive to the NH3-SCR reaction through L-H pathway, which might be the primary reason for its good K resistance. (C) 2017 Elsevier B.V. All rights reserved.
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