Abstract

To study the effect of different modification reagents on activated carbon (AC), HNO₃, H₂SO₄, H₂O₂, H₂C₂O₄, and H₃PO₄ were chosen to modify AC. Then a series of Mn/AC catalysts were prepared by impregnation method. The denitrification performance and SO₂ adsorption activities of these catalysts were tested. The results indicated that the catalyst prepared by HNO₃-modified AC has both the highest NO conversion and SO₂ adsorption activity. The NO conversion can reach 80% at 180 °C and SO₂ saturated adsorption time can reach 30 min. To investigate the enhanced modification mechanisms of HNO₃, the various modified samples were characterized by SEM-EDS, XPS, FTIR, and NH₃-TPD. And the results show HNO₃ 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 HNO₃ can promote the adsorption of NO, thus improving the denitrification performance. As a result, HNO₃ can play a better role in activating AC, and the catalyst modified by HNO₃ is more conducive to be used as the carrier of SCR catalysts.

摘要

为研究不同改性试剂对活性炭(AC)的影响，选择HNO ₃、H ₂ SO ₄、H ₂ O ₂、H ₂ C ₂ O ₄和H ₃ PO ₄对活性炭进行改性。然后采用浸渍法制备了一系列Mn/AC催化剂。测试了这些催化剂的脱硝性能和SO ₂吸附活性。结果表明，HNO ₃改性活性炭制备的催化剂具有最高的NO转化率和SO ₂吸附活性。_{NO转化率在180°C和SO 2}时可达80%饱和吸附时间可达30 min。为了研究HNO ₃的增强改性机制，各种改性样品通过SEM-EDS、XPS、FTIR和NH ₃ -TPD进行了表征。结果表明HNO ₃可以有效增加活性炭表面化学吸附氧的量。_{另一方面，HNO 3}引入的含氮官能团可以促进NO的吸附，从而提高反硝化性能。因此，HNO ₃能够更好地发挥活化AC的作用，HNO ₃改性的催化剂更有利于作为SCR催化剂的载体。