Influence of acid-base properties of catalysts in the gas-phase dehydration-dehydrogenation of cyclohexanol on amorphous AlPO4 and several inorganic solids

被引:68
|
作者
Bautista, FM [1 ]
Campelo, JM [1 ]
García, A [1 ]
Luna, D [1 ]
Marinas, JM [1 ]
Quirós, RA [1 ]
Romero, AA [1 ]
机构
[1] Univ Cordoba, Fac Ciencias, Dept Quim Organ, E-14014 Cordoba, Spain
关键词
cyclohexanol conversion; acid-base sites; amorphous AlPO4 catalyst;
D O I
10.1016/S0926-860X(02)00540-9
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
A series of metal phosphates (Al, Fe, Ni, Ca and Mn) and stoichiometric (Al/Fe = Al/Ca = 1) mixed systems: FeAl(PO4)(2) and Ca3Al3(PO4)(5), were prepared by an ammonia gelation method. Their amorphous character was determined through several physical methods: nitrogen adsorption, DRIFT and XRD patterns. Gas-phase competitive dehydration/dehydrogenation reaction of cyclohexanol was carried out as a probe reaction and cyclohexene was usually the main reaction product, but different amounts of 1- and 3-methylcyclopentenes as well as cyclohexanone were always obtained. These results were compared to those obtained with 17 commercial inorganic solids (several metal oxides, sulfates and phosphates). A main unexpected conclusion was that cyclohexanol dehydration is obtained not only in acid sites but also in basic sites. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:93 / 107
页数:15
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