TY - JOUR
T1 - Mechanism of arsenic poisoning on SCR catalyst of CeW/Ti and its novel efficient regeneration method with hydrogen
AU - Li, Xiang
AU - Li, Junhua
AU - Peng, Yue
AU - Chang, Huazhen
AU - Zhang, Tao
AU - Zhao, Shen
AU - Si, Wenzhe
AU - Hao, Jiming
N1 - Publisher Copyright:
© 2015.
PY - 2016/5/5
Y1 - 2016/5/5
N2 - Deactivation and regeneration of arsenic are studied on novel CeO2-WO3/TiO2 for selective catalytic reduction (SCR) of NOx with NH3. It is found that the activity and N2 selectivity of poisoned catalyst are inhibited immensely at the entire temperature range. The fresh, poisoned and regenerated catalysts are characterized using XRD, BET, XPS, H2-TPR, NH3-TPD, NO+O2-TPD, in situ Raman and in situ DRIFTS. The characterization results indicate that the poisoning of arsenic decrease BET surface area, surface Ce3+ concentration and the amount of Lewis acid sites and adsorbed NOx species but increase the reducibility and number of chemisorbed oxygen species. According to the in situ DRIFTS investigations, the adsorption of surface-adsorbed NH3 and NOx species is suppressed at low temperature, while the reactivity between surface-adsorbed NH3 and NO is prohibited at high temperature. A novel H2 reduction regeneration not only effectively removes arsenic from the poisoned catalysts, but promotes surface Ce3+/Ce4+ ratio and form new NOx adsorptive sites. However, it also affects the chemical properties of catalyst such as crystalline Ce2(WO4)3 forming, surface active oxygen species raise and loss of Brønsted acid sites.
AB - Deactivation and regeneration of arsenic are studied on novel CeO2-WO3/TiO2 for selective catalytic reduction (SCR) of NOx with NH3. It is found that the activity and N2 selectivity of poisoned catalyst are inhibited immensely at the entire temperature range. The fresh, poisoned and regenerated catalysts are characterized using XRD, BET, XPS, H2-TPR, NH3-TPD, NO+O2-TPD, in situ Raman and in situ DRIFTS. The characterization results indicate that the poisoning of arsenic decrease BET surface area, surface Ce3+ concentration and the amount of Lewis acid sites and adsorbed NOx species but increase the reducibility and number of chemisorbed oxygen species. According to the in situ DRIFTS investigations, the adsorption of surface-adsorbed NH3 and NOx species is suppressed at low temperature, while the reactivity between surface-adsorbed NH3 and NO is prohibited at high temperature. A novel H2 reduction regeneration not only effectively removes arsenic from the poisoned catalysts, but promotes surface Ce3+/Ce4+ ratio and form new NOx adsorptive sites. However, it also affects the chemical properties of catalyst such as crystalline Ce2(WO4)3 forming, surface active oxygen species raise and loss of Brønsted acid sites.
KW - As poisoning
KW - NH-SCR
KW - NO adsorbed species
KW - Regeneration
KW - Surface acid sites
UR - https://www.scopus.com/pages/publications/84949493026
U2 - 10.1016/j.apcatb.2015.11.042
DO - 10.1016/j.apcatb.2015.11.042
M3 - 文章
AN - SCOPUS:84949493026
SN - 0926-3373
VL - 184
SP - 246
EP - 257
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
ER -