An environmentally friendly wide temperature CeWTiOx catalyst with superior performance for the selective catalytic reduction NOx with NH3
Abstract A promising CeWTiO x catalyst for selective catalytic reduction of NO x with NH 3 had been prepared by a facile one-pot solvothermal method, and the NO conversion could reach to 84% at 180°C and maintain above 92% at the temperature range 200–460°C. According to the NH 3 -TPD and N 2 adsorption–desorption, surface acidity and surface area (229.44m 2 /g) of the catalysts were enhanced significantly, both of them were beneficial to the NH 3 adsorption in the SCR process. Besides, the results of XRD, XPS, Raman spectra and TEM indicated that the high dispersion of cerium active species as well as tungsten on anatase TiO 2 was also indispensably for the excellent SCR performance. Combined with the strong reduction capacity from H 2 -TPR analysis as well as the enrichment of oxygen vacancy, it deserved the fine catalytic ability. More importantly, the strong synergistic effect between the Ce–W–Ti formed in the solvothermal system enhanced the catalyst’s resistance to H 2 O and SO 2 . Thus the solvothermal synthesis showed an attractive perspective in the preparation of metal oxides catalysts for the SCR process. Highlights The CeWTiO x catalysts were prepared by facial one-pot solvothermal method. Surface acidity, oxygen vacancy and surface area were enhanced significantly. A strong synergistic effect of Ce–W–Ti occurred during the solvothermal synthesis. The E 35 W 15 -CeWTiO x exhibited excellent SCR performance in a wide temperature range. Graphical abstract The CeWTiO x catalyst for NH 3 -SCR process was prepared by facial one-pot solvothermal method. Surface acidity and oxygen vacancy were enhanced significantly, and active species were highly dispersed since strong synergistic effect formed between cerium, tungsten and titanium. All of these improvements contributed to the excellent SCR performance and better tolerance to SO 2 . [DISPLAY OMISSION]
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