TY - JOUR
T1 - Influence of TiO2-supports on the catalytic properties of catalyts for De-NOx in flue gas
AU - Wang, Chun Xia
AU - Ye, Zhi Ping
AU - Lü, Li Xing
AU - Ye, Qing
AU - Wu, Si Ming
AU - Shi, Yao
PY - 2013/10
Y1 - 2013/10
N2 - 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.
AB - 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.
KW - De-NO in flue gas
KW - Industrial grade-TiO
KW - Nano-TiO
KW - Selective catalytic reduction (SCR)
KW - VO- WO/TiO
UR - http://www.scopus.com/inward/record.url?scp=84891279969&partnerID=8YFLogxK
U2 - 10.3969/j.issn.1003-9015.2013.05.027
DO - 10.3969/j.issn.1003-9015.2013.05.027
M3 - 文章
AN - SCOPUS:84891279969
SN - 1003-9015
VL - 27
SP - 896
EP - 902
JO - Gao Xiao Hua Xue Gong Cheng Xue Bao/Journal of Chemical Engineering of Chinese Universities
JF - Gao Xiao Hua Xue Gong Cheng Xue Bao/Journal of Chemical Engineering of Chinese Universities
IS - 5
ER -