氧化镁载金钯双金属无溶剂催化氧化苯甲醇制备苯甲醛

doi:10.19894/j.issn.1000-0518.200299

摘要/Abstract

摘要： 以聚乙烯醇(PVA)为保护剂,经NaBH₄还原制备金钯纳米双金属并负载到Na₂SiO₃改性的MgO载体MgO-X上,得到Au-Pd/MgO-X催化剂。采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)等技术手段对Au-Pd/MgO-X催化剂的组成、结构和载体碱强度进行了表征。结果表明,该催化剂可在无溶剂条件下催化苯甲醇氧化,随着Au-Pd/MgO-X催化剂碱性增强,产物苯甲醛的选择性提高;在苯甲醇0.1 mol、催化剂Au-Pd/MgO-X 100 mg、O₂ 0.5 MPa、反应时间 3 h、反应温度 120 ℃的条件下,苯甲醇转化率为49.5%时,苯甲醛的选择性达94.7%。催化剂重复使用5次,活性和选择性无明显变化,表明催化剂具有良好的活性及稳定性。

关键词: 氧化镁, 金钯双金属, 苯甲醇, 氧化, 苯甲醛

Abstract: Using polyvinyl alcohol (PVA) as the protective agent, the nano-bimetallic gold-palladium was prepared by the NaBH₄ reduction method and loaded on MgO-X modified by Na₂SiO₃ to synthesize the Au-Pd/MgO-X catalyst. The composition, structure and basic strength of the Au-Pd/MgO-X catalyst were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopry (TEM), etc. The results show that the catalyst catalyzes the oxidation of benzyl alcohol to benzaldehyde under solvent-free conditions. As the basicity of the Au-Pd/MgO-X catalyst increases, the selectivity of benzaldehyde increases. Under the conditions of 0.1 mol of benzyl alcohol, 100 mg of Au-Pd/MgO-X catalyst, 0.5 MPa of O₂, reaction time of 3 h, and reaction temperature of 120 ℃, the conversion of benzyl alcohol is 49.5% and the selectivity of benzaldehyde is 94.7%. The catalyst is used repeatedly for 5 times, and there is no obvious change in activity and selectivity, indicating that the catalyst has good stability.

Key words: Magnesium oxide, Gold-palladium bimetallic, Benzyl alcohol, Oxidation, Benzaldehyde

中图分类号:

O614.8

田舒阳, 吕荣文. 氧化镁载金钯双金属无溶剂催化氧化苯甲醇制备苯甲醛[J]. 应用化学, 2021, 38(7): 789-799.

TIAN Shu-Yang, LYU Rong-Wen. Solvent-Free Oxidation of Benzyl Alcohol to Benzaldehyde Catalyzed by Magnesium Oxide Supported Bimetallic Gold-Palladium[J]. Chinese Journal of Applied Chemistry, 2021, 38(7): 789-799.

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