中文摘要：

首次研究了Pd基催化剂上氢快速选择催化还原NOx反应（快速H2-SCR反应）.结果表明,Pd/Al2O3和Pd/SiO2催化剂表现出极高的活性,在200oC以上时NOx转化率可达100%;但Pd/MgO催化剂在整个考察温度范围均没有活性,这表明载体对催化剂快速H2-SCR活性有决定性作用.与常规H2-SCR反应相比,快速H2-SCR反应明显提高了NOx的消除效率.原位漫反射红外光谱结果表明,快速H2-SCR反应活性的提高来源于加速生成的氨物种以及后续反应速率的加快.

英文摘要：

Fast selective catalytic reduction of NOx by hydrogen （fast H2-SCR） was studied for the first time over Pd-based catalysts. Pd/Al2O3 and Pd/SiO2 exhibited attractive activity and gave 100% NOx conversion above 200 oC. In contrast, Pd/MgO had no activity. The supports had a decisive effect on the performance of the catalysts in fast H2-SCR reaction. Compared with the standard H2-SCR process, a significant enhancement of de-NOx efficiency was achieved in the fast H2-SCR process. In situ DRIFT data indicated that the acceleration of ammonia formation and its reaction during the fast H2-SCR process should be the key point for the enhancement of deNOx efficiency.