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Vanadia-modified Sb–CeO2/TiO2 catalyst for effective removal of NO by NH3
Lee, K. J.,Maqbool, M. S.,Pullur, A. K.,Jeong, Y. E.,Song, K. H.,Ha, H. P. VSP 2015 Research on chemical intermediates Vol.41 No.4
<P>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 (H-2-TPR), and in-situ DRIFT study. NH3-TPD and H-2-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 A degrees 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.</P>
Maqbool, M.S.,Pullur, A.K.,Ha, H.P. Elsevier 2014 Applied Catalysis B Vol.152 No.-
Sulfur dioxide (SO<SUB>2</SUB>) is considered as a poisoning gas for NH<SUB>3</SUB>-SCR catalysts under real time conditions. However, it has revealed an obvious beneficial effect on the activity of CeO<SUB>2</SUB> containing catalysts. Hereby we report the applied research in sulfation effect on low-temperature activity enhancement of CeO<SUB>2</SUB>-modified, Sb<SUB>2</SUB>O<SUB>3</SUB>-V<SUB>2</SUB>O<SUB>5</SUB>-TiO<SUB>2</SUB> catalyst system pretreated with SO<SUB>2</SUB> under oxidizing conditions at different temperatures for 2h. We have elucidated the real insights via nature-property relationships of the species formed at various SO<SUB>2</SUB> pretreatment temperatures (T=300, 400 and 500<SUP>o</SUP>C) with the help of advanced characterization techniques such as X-ray diffraction (XRD), temperature programmed reaction (NH<SUB>3</SUB>-TPD, NO-TPD and H<SUB>2</SUB>-TPR), BET surface area, scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS) and X-ray photoelectron spectroscopy (XPS). Our results indicated that SO<SUB>2</SUB> pre-treatment at 500<SUP>o</SUP>C led to the maximum favorable sulfation with cerium(III) sulfate as the major surface species.