Abstract
Abstract The selective catalytic reduction (SCR) of NO with NH 3 over fresh and sulfated CeO 2 catalysts had been investigated in this study. Experimental results showed that the sulfated CeO 2 sample had significantly higher NO conversion than the fresh one and revealed an excellent selectivity to N 2 within the temperature range of 200–570 °C. By characterizations via BET, XRD, XPS, EDS and TPD, it was concluded that the improvement in SCR activity by sulfation might be originated from the increase of active oxygen species and the enhancement of NH 3 chemisorption after surface sulfation, both of which were conducive to NH 3 activation.
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