ID31557576
Published Date2020-01-15
JournalJournal of hazardous materials, 2020-01-15, Volume 382 Find other publications in this journal
Author Info
  • Jiangsu Key Laboratory of Anaerobic Biotechnology, School of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122 PR China; Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094 PR China; Department of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109, USA.
  • Jiangsu Key Laboratory of Anaerobic Biotechnology, School of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122 PR China.
  • Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094 PR China.
  • Department of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109, USA. Electronic address: leima04@gmail.com.
  • Jiangsu Key Laboratory of Anaerobic Biotechnology, School of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122 PR China. Electronic address: yangshijiangsq@163.com.

Abstract

The CeO catalysts grafted with heteropoly acid (i.e., HPA) could enhance their catalytic performance for selective catalytic reduction of NO with NH (NH-SCR). In comparison to HSiW/CeO, HPMo/CeO, and commercial VO-WO/TiO catalysts, HPW/CeO catalysts showed the best SCR performance. XPS and DRIFTS demonstrated that the amount of HPA on HPW/CeO was more than those on HSiW/CeO and HPMo/CeO. H-TPR results indicated that reducibility of HPMo/CeO was stronger than those of HSiW/CeO and HPW/CeO, resulting in the high-temperature performance loss. According to kinetic results, below 250 °C, k and k of HPW/CeO were higher than those of HSiW/CeO, meanwhile k of both HSiW/CeO and HPW/CeO were low. Therefore, HPW/CeO had the better SCR performance than HSiW/CeO. As NH was completely consumed, SCR activity depended on the ratio of SCR reaction in the consumption of NH. The selectivity of SCR reaction, NSCR reaction, and C-O reaction of HSiW/CeO were almost the same as those of HPW/CeO above 250 °C, resulting in the NO conversion of HPW/CeO was basically the same as that of HSiW/CeO above 250 °C. Due to the lowest k and k, and highest k, NO conversion of HPMo/CeO was the worst compared to HSiW/CeO and HPW/CeO catalysts.