화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.24, 79-86, April, 2015
DOI10.1016/j.jiec.2014.09.012  Export Citation
Effect of metal oxide partial substitution of V2O5 in V2O5?WO3/TiO2 on selective catalytic reduction of NO with NH3
Qing-mao Zhang, Chong-lin Song†, Gang Lv, Feng Bin, Hua-ting Pang, and Jin-ou Song
  • State Key Laboratory of Engines, Tianjin University, Weijin Road 92, Tianjin 300072, PR China
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After partial substitution of V2O5 in V2O5?WO3/TiO2 by metal oxide (MxOy, M = Fe, Co, Ni, Cu, Sr, La, and Ce), the NO conversions for the MxOy?V2O5?WO3/TiO2 catalysts (M-VW) showed the following sequence: Co?VW > Fe?VW > Sr-VW ? Ce-VW ? La-VW > VW > Ni-VW > Cu-VW. The reduction activities for almost all the M-VW catalysts were enhanced at reaction temperature >400 °C, but only the Co-VW catalyst showed an increased activity at temperature <400 °C. Among the M-VW catalysts tested, the Co-VW sample had the highest catalytic activity with a temperature range of 300?550 °C for more than 90% NO removal at a GHSV of 60 000 h?1. Moreover, the Co-VW sample exhibited high space-velocity, H2O and SO2 resistance, and low N2O yield. Co partial substitution for V in the VW led to more Lewis acid sites and Brønsted acid sites, and an obvious increase in the ratio of the adsorbed oxygen to the lattice oxygen from 12.74% for VW to 36.73% for Co-VW. The increased adsorbed oxygen and Lewis and Brønsted acid sites contributed to the improved SCR activity of the Co-VW sample.
Keywords:Selective catalytic reduction;Nitric oxide;V2O5-WO3-TiO2;Metal oxide;Catalytic activity
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