催化学报

催化学报 ›› 2010, Vol. 31 ›› Issue (6): 626-630.

• 研究论文 • 上一篇    下一篇

粒子尺寸对 Cu/MgO 上 1-辛醇转移脱氢反应的影响

师瑞娟, 王非, 牟效玲, 塔娜, 李勇, 黄秀敏, 申文杰   

  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
  • 收稿日期:2010-06-25 出版日期:2010-06-25 发布日期:2013-12-05

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

SHI Ruijuan, WANG Fei, MU Xiaoling, Ta Na, LI Yong, HUANG Xiumin, SHEN Wenjie儀*   

  1. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China
  • Received:2010-06-25 Online:2010-06-25 Published:2013-12-05

PDF

1168

被引次数

12

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 4.6 nm 增大到 7.4 nm, 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.

关键词: 铜, 氧化镁, 粒子尺寸, 转移脱氢, 1-辛醇, 1-辛醛

Abstract: 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 -hydrogen from the reactive alkoxide intermediate formed on the surface of MgO and simul-taneously catalyzed the hydrogenation of styrene.

Key words: copper, magnesia, particle size, transfer dehydrogenation, 1-octanol, 1-octanal