Cu2O催化甲醛乙炔化反应助剂效应

在液相还原法制备的纯Cu2O样品中,采用浸渍法分别引入Mg、Al、Fe助剂制备Cu2O-MgO、Cu2O-Al2O3、Cu2O-Fe2O3催化剂。采用XRD、FT-IR、TEM和H2-TPR等对催化剂进行表征,研究不同助剂的加入对甲醛乙炔化反应的影响。结果表明,不同助剂对催化剂的结晶度和可还原性能有较大影响,进而使甲醛乙炔化表现出不同的催化活性。相比MgO与Al2O3,Fe2O3的引入,使Cu2O结晶度明显下降,主要是由于Fe2O3与Cu2O之间产生强的相互作用,有利于乙炔亚铜活性物种的形成,从而表现出最优的催化性能。

Effect of additives on acetylenation of formaldehyde catalyzed by Cu2O

Mg,Al and Fe additives were introduced to pure Cu₂O samples prepared by liquid phase reduction to prepare Cu₂O-MgO,Cu₂O-Al₂O₃ and Cu₂O-Fe₂O₃ catalyst. XRD,FT-IR,TEM and H₂-TPR were used to characterize the effects of additives on acetylation of formaldehyde.The results showed that additives had great influence on the crystallinity and reducibility of the catalyst,and led to different catalytic performance for formaldehyde acetylation.Compared with MgO and Al₂O₃,the introduction of Fe₂O₃ significantly decreased the crystallinity of Cu₂O due to the strong interaction between Fe₂O₃ and Cu₂O,which was conducive to the formation of active species of cuprous alkyne,and finally resulted in optimal catalytic performance.