Influence of precursors on the sulfated alumina superacid: Support and impregnating solution effect

被引：22

作者：

Yang, TS

Chang, TH

Yeh, CT

机构：

[1] NATL TSING HUA UNIV,DEPT CHEM,HSINCHU 300,TAIWAN

[2] MING HSIN INST TECHNOL & COMMERCE,DEPT CHEM ENGN,HSINCHU 304,TAIWAN

来源：

JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL | 1997年 / 123卷 / 2-3期

关键词：

sulfated alumina; superacid; derivative thermogravimetry (DTG); temperature-programmed desorption of ammonia (NH3-TPD);

D O I：

10.1016/S1381-1169(97)00056-3

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：

Sulfated aluminas (SO42-/gamma-Al2O3) were prepared via impregnation of different commercial gamma-Al2O3 with different sulfate solutions (H2SO4, Al-2(SO4)(3), (NH4)(2)SO4, Na2SO4). The amount of superacidic sulfate strongly depended on both precursors of gamma-Al2O3 and the impregnating solution. A higher loading of superacidic sulfate would be created when gamma-Al2O3 possessing more strong basic OH groups on the surface was impregnated with stronger acidic solution (H2SO4). The amount of the strongly basic OH groups was related to the fraction of octahedral Al3+ in the bulk structure. in addition, the SO42-/MgAl2O4 sample was found to have more superacidic sulfate with a stronger acidity (H-0 less than or equal to -14.5) than SO42-/gamma-Al2O3 (H-0 less than or equal to -13.8) for more and stronger basic OH groups on MgAl2O3 than gamma-Al2O3. (C) 1997 Published by Elsevier Science B.V.

引用

页码：163 / 169

页数：7

共 17 条

[1] SOLID CATALYST TREATED WITH ANION .18. BENZOYLATION OF TOLUENE WITH BENZOYL CHLORIDE AND BENZOIC ANHYDRIDE CATALYZED BY SOLID SUPERACID OF SULFATE-SUPPORTED ALUMINA [J].