Vanadia-modified Sb-CeO₂/TiO₂ catalyst for effective removal of NO by NH₃

The Sb-CeO₂/TiO₂ (SCT) catalytic system with different vanadia loading (0-3 % w/w) was systematically investigated for removal of NO by NH₃. A series of catalysts prepared by impregnation and deposition precipitation methods were thoroughly characterized physically, by BET surface area, X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS), and chemically, by temperature-programmed desorption (NH₃ and SO₂-TPD), temperature programmed reduction (H₂-TPR), and in-situ DRIFT study. NH₃-TPD and H₂-TPR results for 2 and 3 % vanadia-loaded Sb-CeO₂/TiO₂ catalysts revealed high total acidity and reducibility. As a result, both catalysts had high activity at low temperatures. At 240 °C for 20 h the 2 % vanadia-loaded Sb-CeO₂/TiO₂ catalyst was more resistant to SO₂ than the 3 % vanadia catalyst. In addition, in-situ SO₂ DRIFT study revealed the existence of more surface sulfate species on Sb-CeO₂/TiO₂ than on vanadia-loaded Sb-CeO₂/TiO₂ catalysts.