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Poisoning effect of CaO on CeO2/TiO2 catalysts for selective catalytic reduction of NO with NH3
Ye Jiang,Xuechong Wang,Changzhong Bao,Shanbo Huang,Xiuxia Zhang,Xinwei Wang 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.6
The effect of CaO on CeO2/TiO2 catalysts prepared by a single step sol-gel method for selective catalytic reduction of NO with NH3 was investigated. The results showed that CaO could severely deactivate the CeO2/TiO2 catalysts. Based on the characterization results obtained by BET, XRD, XPS, H2-TPR and NH3-TPD, the deactivation by CaO of CeO2/TiO2 catalysts should be attributed to pore blockage, lower concentration of Ce on catalyst surface, reduction of Ce3+ and surface adsorbed oxygen, degradation of redox ability and decrease in NH3 adsorption capacity. The theoretical DFT results demonstrated that Ca atom could strongly interact with cerium oxygen, which inhibits the formation and hydrogenation of oxygen vacancies on catalyst surface.
Ye Jiang,Zhimin Xing,Xuechong Wang,Shanbo Huang,Qingyu Liu,Jingshan Yang 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.29 No.-
A MoO3 modified CeO2/TiO2 catalyst was prepared by a single step sol–gel method for selective catalyticreduction of NO with NH3. The experimental results indicates that MoO3 modified CeO2/TiO2 catalystexhibited higher SCR activity and resistance to 10% H2O and 1000 ppm SO2. From the characterizationresults, it can be concluded that good physical properties, highly dispersed active species of Ce and Mo,more appearance of Ce3+ and chemisorbed oxygen, strong interaction among ceria, molybdenum andtitania, and high oxygen storage capacity might contribute to the excellent deNOx performance of CeO2–MoO3/TiO2 catalyst prepared by a single step sol–gel method.