Use of pyrrole as an IR spectroscopic molecular probe in a surface basicity study of metal oxides

被引:36
作者
Binet, C
Jadi, A
Lamotte, J
Lavalley, JC
机构
[1] Laboratoire Catalyse et Spectrochimie - URA CNRS 414, ISMRA-Universite-6, 14050 Caen Cedex, Boulevard du Maréchal Juin
来源
JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS | 1996年 / 92卷 / 01期
关键词
D O I
10.1039/ft9969200123
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
Pyrrole has been adsorbed on various metal oxides: reduced or unreduced ceria, alumina dehydroxylated to varying extents and an NaX zeolite. Pyrrole adsorption was found to be either non-dissociative or dissociative (on the more basic adsorption sites), the pyrrolate anion being formed in the latter case. When bound to surface hydroxy groups through an easily polarizable H bond, the pyrrolate anion was thought possibly to be non-planar; complex progressions of IR bands were then observed involving the combination of CH-stretching modes with a ring-deformation vibration. When pyrrole was non-dissociatively adsorbed through an NH ... O bridge with O2- moderately basic surface centres, the shift of the NH-stretching frequency reflected the O2- basicity. Interaction with surface hydroxy groups led to NH ...(OH) hydrogen-bridged species, which have been found to be either cyclic or linear according to whether the hydroxy groups are monodentate or bidentate, respectively.
引用
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页码:123 / 129
页数:7
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