Supported metal sulfates on Ce–TiOx as catalysts for NH3–SCR of NO: High resistances to SO2 and potassium

• Loading of Cu/Fe sulfate improves the SO2 resistance of Ce–Ti oxide.
• Sulfate loaded Ce–Ti oxide shows better resistance to potassium than V–W–Ti oxide.
• The prepared catalysts show better bulk reducibilities than V–W–TiOx after K-doping.
• The sulfate modified Ce–TiOx show better acidity than V–W–TiOx after K-doping.

Cu and Fe sulfates were loaded on a Ce–Ti mixed oxide and tested for the reduction of NO with NH3. The loading of metal sulfate greatly enhances the resistance to SO2 of the Ce–Ti oxide. The prepared catalysts also show better performances after doping with K2O if compared to the V–W–TiOx catalyst. Surface characterizations reveal that better resistance to potassium oxide can be attributed to better acidity and reducibility. The catalyst with iron sulfate supported on Ce–TiOx was found to be a promising catalyst for NO removal in the flue gas with high alkali metal content.

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