Novel sulfation effect on low-temperature activity enhancement of CeO₂-added Sb-V₂O₅/TiO₂ catalyst for NH₃-SCR

다국어 초록 (Multilingual Abstract)

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.