SPECTROSCOPIC INVESTIGATION OF THE MOLYBDENUM ACTIVE-SITES ON MO-VI HETEROGENEOUS CATALYSTS FOR ALKENE EPOXIDATION

被引:9
作者
MORAZZONI, F
CANEVALI, C
DAPRILE, F
BIANCHI, CL
TEMPESTI, E
GIUFFRE, L
AIROLDI, G
机构
[1] UNIV MILAN,DIPARTIMENTO CHIM FIS & ELETTROCHIM,I-20133 MILAN,ITALY
[2] UNIV BRESCIA,DIPARTIMENTO INGN MECCAN,I-25060 BRESCIA,ITALY
[3] POLITECN MILAN,DIPARTIMENTO CHIM IND,I-20133 MILAN,ITALY
来源
JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS | 1995年 / 91卷 / 21期
关键词
D O I
10.1039/ft9959103969
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
Spectroscopic and spectromagnetic investigations on molybdenum centres in MoO3 . H2O and its polymer-supported form have been carried out. Both were tested as catalysts for cyclohexene epoxidation in a heterogeneous phase; both needed activating pretreatment before the reaction. XPS and EPR data show that the metal is mainly present as Mo-VI. The activation process increases the acidic character of Mo-VI and its efficiency depends both on the oxidizing power of the activating reactant and on the accessibility of the metal to the reactant. The steric hindrance of Mo-VI lowers the catalytic activity owing to the replacement of H2O by carboxylic groups of the functionalized resin.
引用
收藏
页码:3969 / 3974
页数:6
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