Boria modified alumina probed by methanol dehydration and IR spectroscopy

被引:22
作者
de Farias, AMD
Esteves, AML
Ziarelli, F
Caldarelli, S
Fraga, MA
Appel, LG
机构
[1] Inst Nacl Tecnol, INT, Catalyse Lab, LACAT, BR-20081310 Rio De Janeiro, RJ, Brazil
[2] Univ Aix Marseille 3, Serv 511, F-13013 Marseille, France
关键词
boria modified alumina; IR spectroscopy; methanol dehydration;
D O I
10.1016/j.apsusc.2003.11.052
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
Al2O3.B2O3 catalysts were synthesized by co-precipitation and impregnation methods applying two calcination temperatures and boria loadings. Catalysts were analyzed by IR spectroscopy of pyridine and CO2 adsorption and were evaluated in methanol dehydration. Results showed that boron addition to alumina causes a decrease of the number of basic and Lewis acid sites on alumina surface. It could also be observed an enhancement in acid strength of Lewis sites for impregnated samples. The results of methanol dehydration show that strong Bronsted sites are not formed on borate alumina. (C) 2003 Elsevier B.V. All rights reserved.
引用
收藏
页码:132 / 138
页数:7
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