Effects of WO3 and SiO2 doping on CeO2-TiO2 catalysts for selective catalytic reduction of NO with ammonia

Rongrong Fan; Zhaoqiang Li; Yan Wang; Cheng Zhang; Yu Wang; Zhiyong Ding; Xin Guo; Rong Wang

doi:10.1039/d0ra00053a

Effects of WO₃ and SiO₂ doping on CeO₂-TiO₂ catalysts for selective catalytic reduction of NO with ammonia

RSC Adv. 2020 Feb 5;10(10):5845-5852. doi: 10.1039/d0ra00053a. eCollection 2020 Feb 4.

Authors

Rongrong Fan^{1

2}, Zhaoqiang Li^{1

2}, Yan Wang^{1

2}, Cheng Zhang^{1

2}, Yu Wang^{1

2}, Zhiyong Ding^{1

2}, Xin Guo^{1

2}, Rong Wang^{1

2}

Affiliations

¹ State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization, Baotou Research Institute of Rare Earths Baotou 014030 China li_brire@163.com.
² National Engineering Research Center of Rare Earth Metallurgy and Functional Materials Baotou 014030 China.

Abstract

A series of CeO₂-WO₃/SiO₂-TiO₂ (CeW _x TiSi _y ) catalysts with different loading amounts of WO₃ were synthesized by wet co-impregnation of ammonium metatungstate and cerium nitrate on a SiO₂-TiO₂ support, and were employed for the selective catalytic reduction (SCR) of NO by NH₃. The catalytic activity of the CeO₂/SiO₂-TiO₂ (CeSiTi) catalyst was enhanced by the addition of WO₃, and the W-containing catalysts showed higher hydrothermal stability especially between 550 and 600 °C. The introduction of WO₃ to the CeSiTi catalyst could produce more chemisorbed oxygen species, reducible subsurface oxygen species, acid sites and ad-NO _x species. Moreover, the modification of CeO₂-WO₃/TiO₂ (CeWTi) by SiO₂ could enhance the specific surface area, especially the aged specific surface area, thus improving the hydrothermal stability of the catalyst.