On the surface basic properties of sulfated magnesia-silica sol-gel mixed oxides

被引：12
|
作者：
López, T
Gómez, R
Llanos, ME
García-Figueroa, E
Navarrete, J
López-Salinas, E
机构：
[1] Univ Autonoma Metropolitana Iztapalapa, Dept Chem, Mexico City 09340, DF, Mexico
[2] Inst Mexicano Petr, SGTI, Mexico City 07730, DF, Mexico
来源：
MATERIALS LETTERS | 1999年 / 39卷 / 01期
关键词：
magnesia-silica sol-gel; magnesia-silica sulfation; acetone aldolic condensation; magnesia-silica morphology; basic catalysts;
D O I：
10.1016/S0167-577X(98)00216-X
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The morphology and surface base properties of a family of sulfated MgO-SiO2 mixed oxides prepared by the sol-gel method were studied. Morphological features of the sulfated system are found to vary with preparative conditions. Electron dispersive spectroscopy (EDS) analysis of the samples show a very high homogeneous distribution of sulfur and magnesium on the surface. It was found by CO2-Thermal programmed desorption (CO2-TPD) study that the basic site number, strength and density depend on the relative concentration of magnesium and sulfation. Fourier Transform Infrared (FTIR) spectroscopy of CDCl3 yield complementary information on the nature and heterogeneity of surface basic centers. Aldolic condensation of acetone was performed as a test reaction for basicity characterization. (C) 1999 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：51 / 57
页数：7
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