Effect of Vanadium Structure and Lattice Oxygen in V-Based TiO2 Catalysts on Selective Catalytic Reduction of NOx by NH3

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

Kwang Hee Park¹  Sung Chang Hong¹  Dong Wook Kwon² 

[1] Department of Development & Reseach Engineer, Alamtum Co., Ltd.;Department of Environmental Energy Engineering, Graduate School of Kyonggi University

关键词: Vanadia/Titania;    NH3 SCR;    NOx Removal;    Vanadium Structure;    Polymeric Vanadate;   

DOI  :  10.1252/jcej.15we082

来源: Maruzen Company Ltd

【 摘 要 】

References(46)In this study, the correlation between surface vanadium species and reactive lattice oxygen in the selective catalytic reduction of NOx by NH3 was investigated. The properties of the V/TiO2 catalysts were investigated using physicochemical measurements, including Brunauer–Emmett–Teller surface area, temperature programmed reduction with hydrogen, Raman spectroscopy, and UV–visible diffuse reflectance spectroscopy. V/TiO2 catalysts were prepared using the wet impregnation method by supporting 2 wt% vanadium on TiO2 thermally treated at various calcination temperatures. Lattice oxygen participating in the reaction was found to be most abundant in 2V/TiO2-600, prepared from TiO2 calcined at 600°C. An increase in reactive lattice oxygen, resulting from an increase in the proportion of polymeric distorted tetrahedral structure existing on the surface of the catalyst, improved the catalyst efficiency. A polymeric distorted tetrahedral structure is referred to as a bridged bond (V–O–V). In addition, greater SO2 resistance was related to a higher polymeric VOx ratio. Thus, the bridged bond (V–O–V) provides the lattice oxygen participating in the reaction.

【 授权许可】

Unknown