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Article in Press  PDF(945 KB)  
doi: 10.4209/aaqr.2016.08.0352   

Preparation and Characterization of CeO2-MoO3/TiO2 Catalysts for Selective Catalytic Reduction of NO with NH3

Ye Jiang, Xuechong Wang, Zhimin Xing, Changzhong Bao, Guitao Liang

College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266580, China

 

Highlights
  • The CeO2-MoO3/TiO2 catalyst were prepared by three methods.
  • The catalyst prepared by a single step sol-gel method showed the best activity.
  • The reasons contributing to its superior deNOx performance were proposed.

Abstract

 

CeO2-MoO3/TiO2 catalysts were prepared by three methods: a single step sol-gel (SG), impregnation (IM) and coprecipitation (CP) method. These catalysts were investigated for selective catalytic reduction (SCR) of NO with NH3. The results indicate that the catalyst prepared by the SG method possessed the widest temperature window (about 250–475°C), best SCR activity below 450°C and resistance against 10% H2O and 1000 ppm SO2 at a gas hourly space velocity (GHSV) of 90,000 h–1. According to the results of BET, XRD, XPS, H2-TPR and TEM, it is found that larger BET surface area, more highly dispersed active species of Ce and Mo, presence of more Ce3+ and chemisorbed oxygen, synergistic effect among ceria, molybdenum and titania, and better redox ability can contribute to the better deNOx performance of the CeO2-MoO3/TiO2 catalyst prepared by the SG method, compared with those by the IM and CP methods.

 

 

Keywords: Selective catalytic reduction (SCR); CeO2-MoO3/TiO2; NO removal; NH3; Preparation methods.

 

 

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