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TiO2 nanotube-supported V2O5 catalysts for selective NO reduction by NH3
Qin Zhong,Liyuan Xiong,Qianqiao Chen,Shule Zhang 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.4
TiO2 nanotubes (TNT) were prepared by hydrothermal method at 140 oC for 23 h. The V2O5/TNT (VTNT)catalysts were obtained by impregnation in NH4VO3 solution. The VTNTs exhibited much higher denitration efficiency than those supported on the raw TiO2, and satisfactory resistance to water and sulfur. Results from BET, TEM, XRD,NH3-TPD and EPR verified that V2O5 was dispersed well on TNT, thus favoring NH3 adsorption, promoting the transformation from V5+ to V4+, conducing to the formation of oxygen vacancies and superoxide radicals in the presence of NH3 and O2, and then resulting in the high catalytic activity of VTNTs.
Modeling of ammonia-based wet flue gas desulfurization in the spray scrubber
Yong Jia,Qin Zhong,Xuyou Fan,Qianqiao Chen,Haibo Sun 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.4
A mathematical model of ammonia-based wet flue gas desulfurization process was developed based on the double film theory. The calculated results of the desulfurization system for two 220 t·h^−1 boilers per unit by this model were compared to that of corresponding measured data. It was found that the calculated results agree well with the measured data for the operating conditions of pH, liquid/gas ratio and SO_2 concentration. This model can provide predictions of the absorption performance of an ammonia-based wet flue gas desulfurization process and appears to be helpful for designing scrubbers for SO_2 absorption with ammonia absorbent.