化学
一氧化碳
催化作用
锂(药物)
氢
无机化学
碳化合物
碳纤维
化学反应
有机化学
复合数
医学
内分泌学
材料科学
复合材料
作者
C. Diagne,Hicham Idriss,J. P. Hindermann,Alain Kiennemann
出处
期刊:Applied Catalysis
[Elsevier]
日期:1989-06-01
卷期号:51 (1): 165-180
被引量:25
标识
DOI:10.1016/s0166-9834(00)80203-1
摘要
At a low percentage, lithium (0.15%) increases the methanol activity and selectivity of a Pd/CeO2 catalyst. Higher lithium loadings result in the appearance of ethanol (23.4% ethanol selectivity on 3% Pd-1% Li/CeO2) but with a decreased overall catalytic activity. The maximum amounts of surface formyl species and of adsorbed carbon monoxide correspond to the most active methanol synthesis catalyst (3% Pd-0.15% Li/CeO2). These results suggest that lithium can stabilize adsorbed carbon monoxide and surface formyl species. An increase in the temperature of desorption of carbon monoxide after carbon monoxide-hydrogen reaction (from 470 to 590 K) is attributed to an interaction between adsorbed CO and Li+. This interaction can both favour carbon monoxide dissociation and carbon monoxide insertion reactions. Temperature-programmed desorption after ethanol adsorption was performed and a mechanism of ethanol formation is proposed.
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