Acidic-base properties of silica-magnesia sol-gel mixed oxides:: use of 2 butanol as test reaction

被引:25
作者
López, T
Gomez, R
Llanos, ME
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
关键词
MgO-SiO2 sol-gel oxides; pyridine FTIR studies; acid-base properties; ammonia TPD; CO2; TPD;
D O I
10.1016/S0167-577X(98)00174-8
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
2-butanol dehydration was performed as a test reaction for acid-base characterization of a series of unsulfated and sulfated silica-magnesia sol-gel mixed oxides covering the 1.3-6.7% MgO composition range. The dehydration of 2-butanol over non-sulfated silica-magnesia yields a mixture of butenes in which the fraction of 2-butene (Saytzeff orientation) is 33%. High selectivity for l-butene (Hofmann orientation) is indicative of the E1cB mechanism over sulfated silica-magnesia oxides. The acid-base properties were also investigated by ammonia and carbon dioxide TPD and FTIR spectroscopy of adsorbed pyridine. Acid-base properties are discussed as a function of magnesium content (nature, strength and amount of sites). A very good correlation between the results of test reactions and acid-base characterization methods is observed. (C) 1999 Elsevier Science B.V. Ail rights reserved.
引用
收藏
页码:283 / 288
页数:6
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