Promotional effects of copper doping on Ti-Ce-O_x for selective catalytic reduction of NO by NH_3 at low temperature  

作　　者：杨波 沈岳松 曾燕伟 沈树宝 祝社民 

机构地区：[1]College of Materials Science and Engineering, Nanjing Tech University [2]College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University

出　　处：《Journal of Rare Earths》2016年第3期268-275,共8页稀土学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(51272105);the National Key Technology R&D Program of China(2012BAE01B03);the Research Subject of Environmental Protection Department of Jiangsu Province of China(2013006);the Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)

摘　　要：A series of copper-doped Ti-Ce-O_x complex oxide catalysts were synthesized by sol-gel method and evaluated for selective catalytic reduction of NO by NH_3 at low temperature. The promotional effect of copper doping on their structure, acidity and catalytic activity were investigated by means of Brumauer-Emmett-Teller（BET）, temperature-programmed reduction（H_2-TPR）, X-ray diffraction（XRD）, scanning electron microscopy（SEM）, temperature programmed desorption（NH_3-TPD） and pyridine adsorption infrared spectrum（Py-IR） technologies. Results showed that the copper additives could improve the low temperature catalytic performance for selective catalytic reduction of Ti-Ce-O_x catalyst and the NO conversion efficiency of Ti-Cu-Ce-O_x catalyst reached above 90% at 150-250 oC（Ti/Cu=4）. The introduction of copper could enhance the redox property of the Ti-Ce-O_x complex oxide catalyst, refine the particle size caused by lattice distortion and oxygen vacancy defect and enhance the acid amount of the Lewis acid site. Moreover, Ti-Cu-Ce-O_x complex oxide catalyst also had good anti-sulfur ability and anti-water influence, when injecting 300 ppm SO_2 and 10 vol.%H_2O, the NO conversion efficiency of Ti-Cu-Ce-O_x catalyst reached 80%.A series of copper-doped Ti-Ce-O_x complex oxide catalysts were synthesized by sol-gel method and evaluated for selective catalytic reduction of NO by NH_3 at low temperature. The promotional effect of copper doping on their structure, acidity and catalytic activity were investigated by means of Brumauer-Emmett-Teller（BET）, temperature-programmed reduction（H_2-TPR）, X-ray diffraction（XRD）, scanning electron microscopy（SEM）, temperature programmed desorption（NH_3-TPD） and pyridine adsorption infrared spectrum（Py-IR） technologies. Results showed that the copper additives could improve the low temperature catalytic performance for selective catalytic reduction of Ti-Ce-O_x catalyst and the NO conversion efficiency of Ti-Cu-Ce-O_x catalyst reached above 90% at 150-250 oC（Ti/Cu=4）. The introduction of copper could enhance the redox property of the Ti-Ce-O_x complex oxide catalyst, refine the particle size caused by lattice distortion and oxygen vacancy defect and enhance the acid amount of the Lewis acid site. Moreover, Ti-Cu-Ce-O_x complex oxide catalyst also had good anti-sulfur ability and anti-water influence, when injecting 300 ppm SO_2 and 10 vol.%H_2O, the NO conversion efficiency of Ti-Cu-Ce-O_x catalyst reached 80%.

关 键 词：Ti-Cu-Ce-Ox catalyst selective catalytic reduction low temperature Cu doping rare earths 

分 类 号：X701[环境科学与工程—环境工程] O643.36[理学—物理化学]