Zn Promoted Mg-Al Mixed Oxides-Supported Gold Nanoclusters for Direct Oxidative Esterification of Aldehyde to Ester

被引：10
作者：
Li, Jie [1 ]
Wang, Shiyi [1 ]
Li, Huayin [1 ]
Tan, Yuan [1 ]
Ding, Yunjie [1 ,2 ,3 ]
机构：
[1] Zhejiang Normal Univ, Hangzhou Inst Adv Studies, 1108 Gengwen Rd, Hangzhou 311231, Peoples R China
[2] Chinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy, Dalian 116023, Peoples R China
[3] Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
来源：
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES | 2021年 / 22卷 / 16期
关键词：
gold catalyst; cluster; hydrotalcite; oxidative esterification; methyl isobutyrate; LAYERED DOUBLE HYDROXIDES; METHYL-METHACRYLATE; N-BUTANOL; CATALYSTS; EFFICIENT; HYDROTALCITES; ALCOHOLS; NANOPARTICLES; CONDENSATION; METHANOL;
D O I：
10.3390/ijms22168668
中图分类号：
Q5 [生物化学]; Q7 [分子生物学];
学科分类号：
071010 ; 081704 ;
摘要：
The synthesis of ester compounds is one of the most important chemical processes. In this work, Zn-Mg-Al mixed oxides with different Zn2+/Mg2+ molar ratios were prepared via co-precipitation method and supported gold nanoclusters to study the direct oxidative esterification of aldehyde and alcohol in the presence of molecular oxygen. Various characterization techniques such as N-2-physical adsorption, X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and CO2 temperature programmed desorption (TPD) were utilized to analyze the structural and electronic properties. Based on the results, the presence of small amounts of Zn2+ ions (similar to 5 wt.%) provoked a remarkable modification of the binary Mg-Al system, which enhanced the interaction between gold with the support and reduced the particle size of gold. For oxidative esterification reaction, the Au-25/Zn0.05MgAl-400 catalyst showed the best performance, with the highest turnover frequency (TOF) of 1933 h(-1). The active center was believed to be located at the interface between metallic gold with the support, where basic sites contribute a lot to transformation of the substrate.
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页数：13
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