Influence of TiO2-supports on the catalytic properties of catalyts for De-NOx in flue gas

Chun Xia Wang, Zhi Ping Ye, Li Xing Lü, Qing Ye, Si Ming Wu, Yao Shi

科研成果: 期刊稿件文章同行评审

5 引用 (Scopus)

摘要

Nano-TiO2 and industrial grade-TiO2 were selected and used as supports of catalysts for De-NOx in flue gas. V2O5 and WO3 were impregnated onto supports TiO2 to obtain the active components 1%V2O5-10%WO3/ TiO2 of the commercial catalysts, which were used for the removal of NOx in flue gas. The allowed gas hourly space velocity(GHSV) of the catalyst supported on nano-TiO2 is much higher than that of the catalyst supported on industrial grade-TiO2. The NH3/NO molar ratio(≥1.0) almost has no effect on the NOx conversion of catalyst supported on nano-TiO2, and a complete conversion of NOx can be achieved with the NH3/NO molar ratio=1.2 in the range of 300~350°C. While the NOx conversion of the catalyst supported on industrial grade-TiO2 reduces significantly with the GHSV increase or the NH3/NO molar ratio decrease. Under the same GHSV(7500 h?1) and NH3/NO molar ratio (1.0), the NOx conversion of catalyst supported on nano-TiO2 reaches almost 100%, while the maximum NOx conversion of catalyst supported on industrial grade-TiO2 is only 85% at 400°C. Besides, the catalyst supported on nano-TiO2 has broader De-NOx temperature window. The supports and catalysts were characterized by scanning electron microscope (SEM), N2 adsorption/desorption, X-ray diffraction (XRD), temperature-programmed desorption for ammonia(NH3-TPD), and particle size analysis. The results show that the specific surface area, pore volume and surface acidity of the catalyst supported on nano-TiO2 are far larger than those of the catalyst supported on industrial grade-TiO2.

源语言英语
页(从-至)896-902
页数7
期刊Gao Xiao Hua Xue Gong Cheng Xue Bao/Journal of Chemical Engineering of Chinese Universities
27
5
DOI
出版状态已出版 - 10月 2013
已对外发布

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