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To study the effect of different modification reagents on activated carbon (AC), HNO 3 , H 2 SO 4 , H 2 O 2 , H 2 C 2 O 4 , and H 3 PO 4  were chosen to modify AC. Then a series of Mn/AC catalysts were prepared by impregnation method. The denitrification performance and SO 2  adsorption activities of these catalysts were tested. The results indicated that the catalyst prepared by HNO 3 -modified AC has both the highest NO conversion and SO 2  adsorption activity. The NO conversion can reach 80% at 180 °C and SO 2  saturated adsorption time can reach 30 min. To investigate the enhanced modification mechanisms of HNO 3 , the various modified samples were characterized by SEM-EDS, XPS, FTIR, and NH 3 -TPD. And the results show HNO 3  can effectively increase the amount of chemical adsorbed oxygen on the surface of AC. And on the other hand, the nitrogen-containing functional groups introduced by HNO 3  can promote the adsorption of NO, thus improving the denitrification performance. As a result, HNO 3  can play a better role in activating AC, and the catalyst modified by HNO 3  is more conducive to be used as the carrier of SCR catalysts.

Effect of acid treatment on surfaces of activated carbon supported catalysts for NO and SO 2 removal