| 王奖,徐爱菊,贾美林,照日格图.Mg-Al类水滑石负载金催化醇选择氧化中Mg/Al比例的影响[J].分子催化,2017,31(1):11-21 |
| Mg-Al类水滑石负载金催化醇选择氧化中Mg/Al比例的影响 |
| Gold Supported on Mg-Al Layered Double Hydroxides for Selective Oxidation of Alcohols: the Effect of Mg/Al Mole Ratio |
| 投稿时间：2016-12-06 修订日期：2017-01-09 |
| DOI： |
| 中文关键词: 金催化剂 类水滑石 醇氧化 载体效应 |
| 英文关键词:gold catalyst layered double hydroxide selective oxidation of alcohol support effect |
| 基金项目:内蒙古自然科学基金（2015MS0225），内蒙古师范大学科学研究基金（2013ZRYB12），内蒙古师范大学引进高层次人才科研启动经费项目（2014YJRC023）. |
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| 中文摘要: |
| 为研究Mg/Al比例对Mg-Al类水滑石（LDH）负载Au催化醇选择氧化的影响，采用共沉淀—水热晶化法合成了不同Mg/Al比的yMg-Al LDH，采用液相还原法负载纳米Au颗粒. 对样品进行XRD、N2物理吸附、ICP-AES、AAS、TEM、CO2-TPD、CO2-In-situ DRIFTS和XPS等表征. 在无附加碱条件下，Au/yMg-Al LDH催化剂催化1-苯乙醇选择氧化的催化活性随Mg/Al比增大呈现递增趋势，Au/4Mg-Al LDH活性最佳. 载体表面弱碱性强度随Mg/Al比增大变化不大，弱碱位略有增多，对醇羟基脱氢有促进作用. 载体层板Mg3OH基团随Mg/Al比增大而增多有利于Au在层板边缘沉积，二者可形成有效协同，促进醇氧化过程进行. |
| 英文摘要: |
| In order to investigate the effect of Mg/Al mole ratio on the catalytic performance of gold supported on Mg-Al layered double hydroxides (LDH) for the selective oxidation of alcohols, a series of Mg-Al LDH with various molar ratios of Mg/Al were prepared by the coprecipitation-hydrothermal crystallization method, on which Au nanoparticles were supported by the liquid-phase reduction method. The samples were characterized by XRD, N2 physical adsorption, ICP-AES, AAS, TEM, CO2-TPD, CO2-In-situ DRIFTS and XPS. The catalytic activities of Au/yMg-Al LDH for the selective oxidation of 1-phenylethyl alcohol under base-free condition were increased with the increase of Mg/Al mole ratio, and Au/4Mg-Al LDH catalyst showed the best catalytic activity. The weak base strength of support surface was changed little with the increase of Mg/Al mole ratio, which promoted the dehydrogenation of alcoholic hydroxyl. The layered Mg3OH groups of the supports were increased with the increase of Mg/Al mole ratio, which was beneficial to the deposition of Au on the edges of LDH platelets. The effective synergy between the two promoted the oxidation of alcohols. |
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