-
摘要: 采用共沉淀-浸渍法制备了催化剂Pd/Mg(Al)O，并用XRD、TPD等手段进行了表征。考察了催化剂的NOx储存还原性能。结果表明，NO在Pd/Mg(Al)O上的主要储存途径是Pd促进NO氧化生成NO2，NO2与Mg(Al)O作用成盐，放出NO；Pd对NO2吸附成盐影响不大。NO在Pd/Mg(Al)O上吸附储存的适宜温度为350℃。350℃下Pd/Mg(Al)O催化剂经15次储存还原（以H2为还原剂），NOx储存量变化不超过8％，维持在300μmol·g－1以上，N2选择性维持在94％以上。Abstract: The storage-reduction behavior of NOx(NO and NO2) on Pd/Mg(Al)O catalyst prepared by co-precipitation followed by impregnation, was investigated in a fixed-bed reactor at atmosphere and different temperatures. The catalyst was characterized by XRD and TPD. The main path of NO storage on Pd/Mg(Al)O is that Pd firstly catalyzes NO and O2 to form NO2, NO2 then reacts with Mg(Al)O to form nitrate and NO. Pd showes little effect on the formation of nitrate from NO2 on catalysts. The NOx storage capacity on Pd/Mg(Al)O has a maximum at 350℃ for NO. At this temperature the NOx storage capacity of the catalyst prepared is no less than 300μmol·g－1, and the selectivity of H2 reducing nitrate to N2 is higher than 94% even if the catalyst is performed in 15 storage-reduction cycles.
-
Key words:
- Mg(Al)O /
- NOx /
- storagereduction /
- Pd
-
点击查看大图
计量
- 文章访问数: 1925
- HTML全文浏览量: 18
- PDF下载量: 1169
- 被引次数: 0
下载:
