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The effect of different pH values (8, 9, 10 and 11) on the catalytic activity over CeSiW catalysts was investigated for the selective catalytic reduction of NO by NH3. CeSiW-9 showed a remarkable higher NOx conversion. The strongest interaction was observed between silicotungstic acid and CeO2 over CeSiW-9, resulting in the improvement of redox ability and surface acidity, which could increase the catalytic activity. The superior catalytic performance of the CeSiW-9 catalyst was attributed to the favored pore structures, excellent redox ability and the abundance of surface acid sites, which depended on pH values in the preparation process of CeSiW catalysts. [ABSTRACT FROM AUTHOR]

The effect of different pH values (8, 9, 10 and 11) on the catalytic activity over CeSiW catalysts was investigated for the selective catalytic reduction of NO by NH3. CeSiW-9 showed a remarkable higher NOx conversion. The strongest interaction was observed between silicotungstic acid and CeO2 over CeSiW-9, resulting in the improvement of redox ability and surface acidity, which could increase the catalytic activity. The superior catalytic performance of the CeSiW-9 catalyst was attributed to the favored pore structures, excellent redox ability and the abundance of surface acid sites, which depended on pH values in the preparation process of CeSiW catalysts. [ABSTRACT FROM AUTHOR]

The CeO2, CeO2‐ZrO2 and CeO2‐WO3 catalysts were prepared by hydrothermal method and used to the selective catalytic reduction of NOx by NH3. The addition of ZrO2 or WO3 into CeO2 was favorable for pore structure, and then improved the number of active sites. Besides, the introduction of ZrO2 into CeO2 could improve the Lewis acid sites while WO3 could contribute to the generation of Brønsted and Lewis acid sites, which could improve the catalytic performance and N2 selectivity. The CeO2‐WO3 catalyst exhibited optimal catalytic activity with above 90% NOx conversion performance at 220–425 °C and approximately 100% N2 selectivity at 150–425 °C. [ABSTRACT FROM AUTHOR]

The CeO2, CeO2‐ZrO2 and CeO2‐WO3 catalysts were prepared by hydrothermal method and used to the selective catalytic reduction of NOx by NH3. The addition of ZrO2 or WO3 into CeO2 was favorable for pore structure, and then improved the number of active sites. Besides, the introduction of ZrO2 into CeO2 could improve the Lewis acid sites while WO3 could contribute to the generation of Brønsted and Lewis acid sites, which could improve the catalytic performance and N2 selectivity. The CeO2‐WO3 catalyst exhibited optimal catalytic activity with above 90% NOx conversion performance at 220–425 °C and approximately 100% N2 selectivity at 150–425 °C. [ABSTRACT FROM AUTHOR]