CeO_2在Pd/γ-Al_2O_3催化剂中的助剂作用

Cocatalytic Role of CeO 2 in Combination with Pd/ γ Al 2O 3 Catalyst

用色谱微反流动法技术考察了富氧和贫氧条件下，添加ＣｅＯ２对Ｐｄ／γＡｌ２Ｏ３催化剂上ＣＯ氧化反应的影响，并运用ＴＰＲ、ＴＰＤＭＳ及ＳＥＭ等技术研究了ＣｅＯ２Ｐｄ／γＡｌ２Ｏ３催化剂．结果表明：ＣｅＯ２、Ｐｄ的共助作用使ＣｅＯ２Ｐｄ／γＡｌ２Ｏ３催化剂ＴＰＲ还原峰温向低温方向移动；ＣｅＯ２的存在使Ｐｄ／γＡｌ２Ｏ３催化剂表面的吸附氧容易脱出，从而改善了催化剂的氧化活性；ＣｅＯ２、Ｐｄ间的强相互作用使催化剂上Ｐｄ元素的分散程度增加．

The TPR, SEM, TPD MS techniques and CO oxidation activity measurement have been used to study CeO 2 Pd/ γ Al 2O 3 catalyst under oxygen enriched and oxygen deficient conditions. Results showed that interaction between CeO 2 and Pd caused the peak of the CeO 2 Pd/ γ Al 2O 3 catalyst in TPR curve to shift to lower temperature, promoted surface oxygen desorption of Pd/ γ Al 2O 3, favored the Pd distribution, improving the oxidation activity of the catalyst.