摘要
分别用Ｘ－光电子能谱、Ｘ－射线衍射、氢氧滴定及红外光谱对催化剂Ｐｄ／α、δ－Ａｌ_２Ｏ_３进行了表征。结果表明：催化剂的活性组份Ｐｄ是以氧化钯ＰｄＯ和氯氧化钯Ｃｌ－Ｐｄ－Ｏ－Ａｌ－两种形式存在。当催化剂经８００℃高温焙烧后，绝大部分Ｃｌ－Ｐｄ－Ｏ－Ａｌ－转化为ＰｄＯ，高温促进ＰｄＯ烧结，活性中心减少，从而解释了催化剂Ｐｄ／α，δ－Ａｌ_２Ｏ_３经高温焙烧后活性降低的原因。
Catalyst Pb/α,δ-Al_2O_3 has been characterized by XPS, XRD, IR and H_2-O_2 titrition. The Results indicated that there were two species, PdO and Cl-Pd-O-Al,on the alumina surface. After the catalyst was heated at 800℃,the majority of CL-Pd-O-Al was converted into PdO, while PdO was sintered and the numbers of active centers decreased. The activity of Pd/α,δ-Al_2O_3 was decreased after the catalyst was heated at 800℃,however the stability of the catalyst increased.
出处
《化学研究与应用》
CAS
CSCD
1996年第2期213-216,共4页
Chemical Research and Application
关键词
钯
催化剂
一氧化碳
催化活性
Palladium CAtalyst, Characterization, CO Oxidation.
