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Enhanced Activity of Nb-modified CeO2/TiO2 Catalyst for the Selective Catalytic Reduction of NO with NH3

Category: Air Pollution Control

Volume: 18 | Issue: 8 | Pages: 2121-2130
DOI: 10.4209/aaqr.2018.02.0059
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Ye Jiang 1, Changzhong Bao1, Shaojun Liu2, Guitao Liang1, Mingyuan Lu1, Chengzhen Lai1, Weiyun Shi1, Shiyuan Ma1

  • 1 College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266580, China
  • 2 State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China

Highlights

CeNbTi showed the excellent activity at 250–450°C in the GHSV of 90,000 h–1.
The introduction of Nb enhanced the resistance to high GHSV, K2O, H2O and SO2.
The reasons contributing to its excellent deNOx performance were proposed.


Abstract

A series of CeO2-Nb2O5/TiO2 catalysts were prepared by an impregnation method and investigated for the selective catalytic reaction (SCR) of NO with NH3. The 15 wt.% CeO2–10 wt.% Nb2O5/TiO2 catalyst (CeNbTi) exhibited the highest activity and resistance to a high gas hourly space velocity and K2O. In the presence of H2O and SO2, it also showed better activity than the CeTi catalyst. The addition of Nb could improve the dispersion of CeO2 and increase the amount of Ce3+ and chemisorbed oxygen species on the catalyst surface, which enhances the catalytic activity of CeTi. The superior SCR activity of CeNbTi might also be attributed to its high redox ability, the enhanced adsorption capacity of NH3 species and the synergistic action between Ce, Nb and Ti species.

Keywords

Selective catalytic reduction NO NH3 CeO2-Nb2O5/TiO2 Impregnation method


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