Promotional effects of copper doping on Ti-Ce-O_x for selective catalytic reduction of NO by NH₃ at low temperature

杨波¹，沈岳松¹，曾燕伟¹，沈树宝²，祝社民¹

1. College of Materials Science and Engineering, Nanjing Tech University2. College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University

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 NH₃ 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（H₂-TPR）, X-ray diffraction（XRD）, scanning electron microscopy（SEM）, temperature programmed desorption（NH₃-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 SO₂ and 10 vol.%H₂O, the NO conversion efficiency of Ti-Cu-Ce-O_x catalyst reached 80%.

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