TY - JOUR
T1 - Synthesis of sulphur-modified bifunctional hydrotalcites and study of their surface characteristics by inverse gas chromatography
AU - Ren, Xiaoqian
AU - Hu, Xi
AU - Zhang, Feng
AU - Wang, Junge
AU - Liang, Jinhua
AU - Wu, Wenliang
AU - Jiang, Min
AU - Wang, Jun
N1 - Publisher Copyright:
© The Royal Society of Chemistry.
PY - 2015/7/17
Y1 - 2015/7/17
N2 - 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, N2 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.
AB - 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, N2 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.
UR - http://www.scopus.com/inward/record.url?scp=84942155668&partnerID=8YFLogxK
U2 - 10.1039/c5cy00765h
DO - 10.1039/c5cy00765h
M3 - 文章
AN - SCOPUS:84942155668
SN - 2044-4753
VL - 5
SP - 4813
EP - 4820
JO - Catalysis Science and Technology
JF - Catalysis Science and Technology
IS - 10
ER -