Abstract
A series of acid modified CeO2 catalysts were prepared and used for selective catalytic reduction (SCR) of NO with NH3. The results showed that the SCR activity of pure CeO2 was greatly enhanced by the modification of acid. The CeO2 modified by 20% phosphotungstic acid exhibited the best NO conversion in a wide temperature range of 150–550°C. The SCR activity was slightly influenced by SO2 and H2O, while such effect was reversible. The improvement of SCR activity and N2 selectivity over CeO2 catalyst modified by acid was attributed to the enhanced amount and intensity of Brønsted or Lewis acid sites.
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