Synthesis of sulphur-modified bifunctional hydrotalcites and study of their surface characteristics by inverse gas chromatography

被引：11
作者：
Ren, Xiaoqian [1 ]
Hu, Xi [1 ]
Zhang, Feng [1 ]
Wang, Junge [1 ]
Liang, Jinhua [2 ]
Wu, Wenliang [1 ]
Jiang, Min [2 ]
Wang, Jun [1 ]
机构：
[1] Nanjing Tech Univ, Coll Chem & Chem Engn, Nanjing 210009, Jiangsu, Peoples R China
[2] Nanjing Tech Univ, Coll Biotechnol & Pharmaceut Engn, Nanjing 210009, Jiangsu, Peoples R China
来源：
CATALYSIS SCIENCE & TECHNOLOGY | 2015年 / 5卷 / 10期
基金：
国家高技术研究发展计划(863计划);
关键词：
LAYERED DOUBLE HYDROXIDES; BASE-CATALYZED REACTIONS; SOLID BASE; ACTIVATED HYDROTALCITES; ALDOL CONDENSATIONS; MIXED OXIDES; ACID; ADSORPTION; POLYMERIZATION; NANOCOMPOSITE;
D O I：
10.1039/c5cy00765h
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In this study, various sulphur-modified hydrotalcite catalysts were prepared, and the influence of calcination temperature on their acid-base properties was investigated. Structural characterization of the catalysts was studied using X-ray powder diffraction, scanning electron microscopy, N-2 physisorption, elemental analysis and Fourier transform infrared spectroscopy. The structural characterization indicated that the layer structure of all catalysts was retained but the specific surface areas were enlarged. Inverse gas chromatography was carried out to quantitatively determine the catalysts' acid-base properties by calculating the thermodynamic parameters, including dispersive surface free energy, adsorption free energy, adsorption enthalpy, and acid-base interaction constants. The results showed that the strength and content of acidic and alkaline sites were enhanced with increasing calcination temperature. Moreover, several typical aldol condensation reactions were selected to study the catalytic activity of the developed catalysts. The results showed that the sulphur-modified hydrotalcite catalysts possess high activity and good regenerability for typical aldol condensation reactions.
引用
收藏
页码：4813 / 4820
页数：8
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