【摘要】 考察了NH4 型 β ,ZSM 5型分子筛催化剂上 ,NO在富氧条件下的低温 (30～ 2 5 0℃ )催化还原行为 .NH+ 4 TPDC和NH3 TPD表征结果与催化剂的DeNOx 反应结果有很好的相关性 .由于NH4 + 离子的消耗引起的催化剂失活 ,可以通过在载气中在线补充NH3 气 ,催化剂经离子交换或NH3 ·H2 O浸渍而恢复 ,提出了气相间隙喷氨操作的可行性更多还原

【Abstract】 The selective catalytic reduction(SCR) of NO in absence of gaseous ammonia is studied over the beta and ZSM-5 zeolites in their NH + 4 forms at temperatures from 30?℃ to 250?℃. The results of temperature programmed decomposition of ammonium ions (NH + 4-TPDC) and temperature programmed desorption of ammonia (NH 3-TPD) show that the activities of the catalysts are associated with the properties of zeolites and the storage capacities for NH + 4 and NH 3. This reaction as present here might become a viable technology for removal of NO x at low temperature without addition of reductants.更多还原