摘要
利用电子探针能谱（ＥＤＳ）、扫描电子显微镜（ＳＥＭ）、Ｘ－射线衍射（ＸＲＤ）对Ｎｉ－Ｐｂ／Ｃ催化剂进行了表征．结果表明，在２５０℃下，催化剂使用１６０ｈ仍有高的活性，未发现有积炭现象．但在３００℃时，活性下降，收率降至３０％．在高温条件下，Ｐｂ富集在催化剂表面上，使Ｎｉ０活性中心数量减少，导致催化剂失活．当温度回复到２５０℃时，催化剂活性又慢慢地恢复．这种失活是可逆的．
eactivation mechanism of ethanol carbonylation over Ni-Pb/C catalyst was studied by EDS、SEM、XRD.The results show that the catalyst retains a high activity at 250℃ after reaction for 160 h, and no coke formation has been found. But at 300℃, the activity lowers and the yield is only 30%. Under high temperatures Pb is enriched on the surface of catalyst with the number of Ni active center decreased, and which caused the deactivation of catalyst is deactivated. When the reaction temperature is returned to 250℃, the activity of reaction is gradually recovered. This deactivation is reversible.
出处
《分子催化》
EI
CAS
CSCD
北大核心
1998年第1期15-18,共4页
Journal of Molecular Catalysis(China)
基金
广东省自然科学基金
广东省高教厅基金
关键词
乙醇羰化
催化剂
失活
镍
铅
双金属
丙酸乙酯
Ethanol carbonylation, Ni-Pb/C catalyst, Deactivation mechanism
