Effect of Hydrothermal Aging Temperature on NO_X Reduction Performance for Sb-V-CeO₂/TiO₂ catalyst = Effect of Hydrothermal Aging Temperature on NO_X Reduction Performance for Sb-V-CeO₂/TiO₂ catalyst

다국어 초록 (Multilingual Abstract)

Herein, we discussed NOX reduction performance of Sb-V-CeO₂/TiO₂ (SbVCT) catalysts subjected to hydrothermal aging, where 6 vol. % of H₂O was fed to the SbVCT for 16 hours with variable temperatures of 550-750 °C. The fresh and aged SbVCT catalysts were characterized using XRD, TEM, Raman, N₂ physisorption, NH₃-TPD, H₂-TPR, and in situ NH₃-DRIFT. The SbVCT catalysts aged at ≤ 600 °C showed better NOX conversions than the others aged at ＞ 600 °C. This was because aging at ≤ 600 °C could help minimize the loss of surface redox/acid characters that were originally inherent to surface vanadyl and CeO₂ species for the SbVCT prior to aging process. In contrast, aging of the SbVCT at ≥ 650 °C led to the transformation of surface vanadyl and CeO₂ species into CeVO₄ and large CeO₂ aggregates. This in turn led to the loss of surface redox/acid characters indigenous to the SbVCT and reduced its NOX reduction performance.