粒子尺寸对Cu/MgO上1-辛醇转移脱氢反应的影响(英文)  

Transfer Dehydrogenation of 1-Octanol to 1-Octanal over Cu/MgO Catalyst:Effect of Cu Particle Size

作　　者：师瑞娟[1] 王非[1] 牟效玲[1] 塔娜[1] 李勇[1] 黄秀敏[1] 申文杰[1] 

机构地区：[1]中国科学院大连化学物理研究所催化基础国家重点实验室,辽宁大连116023

出　　处：《催化学报》2010年第6期626-630,共5页

摘　　要：采用沉积-沉淀法制备了不同Cu粒子大小的Cu/MgO催化剂,并考察了Cu粒子大小对醇类转移脱氢制醛酮反应性能的影响.结果表明,Cu/MgO催化剂对一级脂肪醇的转移脱氢反应具有较高的催化活性.对于1-辛醇脱氢,随着Cu粒子的粒径由4.6nm增大到7.4nm,1-辛醛的收率由65%减小到55%,表现出显著的粒子尺寸效应.反应机理研究表明,醇首先在碱性MgO表面形成醇盐中间物种,随后在Cu纳米粒子上进一步脱去α-氢生成醛酮,同时脱去的氢在Cu纳米粒子上发生苯乙烯加氢反应,完成醇的转移脱氢反应循环.Cu/MgO catalysts with different Cu particle sizes were prepared by a precipitation-deposition method and investigated for their activity in the transfer dehydrogenation of alcohols to carbonyl compounds.They were highly active for the conversion of primary aliphatic alcohols,e.g.1-octanol.With increasing Cu particle size from 4.6 to 7.4 nm,the aldehyde yield decreased from 65% to 55%,which showed a size effect.The copper particle abstracted an α-hydrogen from the reactive alkoxide intermediate formed on the surface of MgO and simultaneously catalyzed the hydrogenation of styrene.

关 键 词：铜 氧化镁 粒子尺寸 转移脱氢 1-辛醇 1-辛醛 

分 类 号：O643.32[理学—物理化学]