Impact of Organic Interlayer Anions in Hydrotalcite Precursor on the Catalytic Activity of Hydrotalcite-Derived Mixed Oxides

被引:34
作者
Meyer, Oliver [1 ]
Roessner, Frank [1 ]
Rakoczy, Rainer A. [2 ]
Fischer, Richard W. [2 ]
机构
[1] Carl VonOssietzky Univ Oldenburg, Inst Pure & Appl Chem, D-26111 Oldenburg, Germany
[2] Catalyt Technol, D-80333 Munich, Germany
关键词
anions; heterogeneous catalysis; hydrotalcites; mixed oxides; transesterification; LAYERED DOUBLE HYDROXIDES; MG-AL HYDROTALCITES; THERMAL-DECOMPOSITION;
D O I
10.1002/cctc.200900257
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
A series of hydrotalcite-derived mixed oxides containing different organic interlayer anions in the hydrotalcite precursors have been synthesized and studied as catalysts in the transesterification of glycerol trioctanoate with methanol. There are significant differences in the catalytic activity of these mixed oxides, indicating a great impact of interlayer anions in hydrotalcite precursors. Generally, anions with high charge density and, therefore, high content within the interlayer of the hydrotalcites lead to higher catalytic activity in the derived mixed oxides in contrast to anions with low charge density. An influence of interlayer anions on the structural properties of the hydrotalcites, such as interlayer distance, which is determined by X-ray diffraction analysis, and on the surface area and pore volume of the corresponding mixed oxides, which are determined by nitrogen adsorption, is obtained. Furthermore, interlayer anions had a significant effect on the thermal stability of the hydrotalcite structure as well as on the pore size distribution of derived mixed oxides.
引用
收藏
页码:314 / 321
页数:8
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