负载Pt、Pd催化剂上NO-TPD和NO催化还原性能

NO TPD and NO Reduction of Supported Pt or Pd Catalysts

负载Ｐｔ、Ｐｄ催化剂上ＮＯ－ＴＰＤ和ＮＯ催化还原性能１）钟依均（浙江师范大学化学系金华３２１００４）罗孟飞周碧袁贤鑫（杭州大学催化研究所杭州３１００２８）关键词负载Ｐｔ、Ｐｄ催化剂ＮＯ－ＴＰＤＣＯ－ＮＯ反应分类号Ｏ６４３．３２氮氧化物（ＮＯｘ）污染是...

Temperature programmed desorption(TPD) was used to study the desorption and decomposition of NO adsorbed on supported Pt or Pd catalysts. There are two kinds of NO adsorption sites on MgO support surface, and only one site on Al 2O 3 surface. They are attributed to the basic sites. It is observed that there is one adsorption site at lower temperature over supported Pt or Pd catalyst, which is attributed to the metal Pt or Pd. Because the basic sites of support surface are covered with Pt or Pd, the NO desorption peak of NO adsorbed support surface decreases markedly. The adsorbed NO undergoes extensive decomposition to form N 2、N 2O and O 2 during the NO thermal desorption on all catalyst and support surfaces. CO NO reaction activity of catalysts is closely related to their NO decomposition activity. The order of reaction activities is Pt/Al 2O 3>Pd/Al 2O 3>Pd/MgO.