%0 Journal Article
%T Impact of Ce-Zr-Al Mixed Oxide Modified by Potassium on Pd-Only Three-Way Catalysts<br>K修饰的CZA载体对全钯三效催化剂性能的影响
%A YAO Qing
%A TIAN Qun
%A CHEN Hong-De
%A HAN Yun
%A <br>姚青
%A 田群
%A 陈宏德
%A 韩芸
%J 中国科学院研究生院学报
%D 2006
%I 
%X The Ce-Zr-Al mixed oxides were prepared by sol-gel method with some special procedures. Pd-K/CZA catalysts were characterized by TG-DTA, XRD, H2-TPR, O2-TPD and CO-TPD. The results showed that the activity of Pd-K/CZA catalysts with a small amount of potassium reduced, when it had been recovered with a large amount of potassium. It is shown by the calculation from CO uptake that the dispersion of Pd increased from 14.8% (K/CZA: 0 wt %) to 22.3% (K/CZA: 1.5 wt%), then decreased to 8.6%(K/CZA: 14.6 wt%). The light-off temperatures of the samples increase with increment of amount of potassium, which is due to poison of potassium that weakens SMSI of Pd-Ce. For the sample K-4 with a big amount of potassium (K/CZA: 14.6 wt%), the poison was lightened because the particle size of Pd is beneficial to the three-way reaction.
%K potassium
%K Ce-Zr-Al mixed oxide
%K TPRs
%K Pd-Ce interaction<br>钾
%K 铈锆铝复合氧化物
%K 程序升温反应
%K Pd-Ce相互作用
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=B5EDD921F3D863E289B22F36E70174A7007B5F5E43D63598017D41BB67247657&cid=B47B31F6349F979B&jid=67CDFDECD959936E166E0F72DE972847&aid=AE86441A880B7FAE&yid=37904DC365DD7266&vid=EA389574707BDED3&iid=38B194292C032A66&sid=717CC18E05F2AFA0&eid=50EA2A80A7D254EF&journal_id=1002-1175&journal_name=中国科学院研究生院学报&referenced_num=0&reference_num=15