EFFECT OF SPINEL (COXCD1-XFE2O4, 0 LESS-THAN-OR-EQUAL-TO X LESS-THAN-OR-EQUAL-TO 1) FORMATION ON THE KINETICS OF CATALYTIC DECOMPOSITION OF HYDROGEN-PEROXIDE OVER COBALT CADMIUM IRON MIXED-OXIDE SYSTEMS

被引:6
作者
GABR, RM
GIRGIS, MM
ELAWAD, AM
机构
[1] Chemistry Department, Assiut University, Assiut
关键词
D O I
10.1021/la00056a016
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
A series of cobalt-cadmium-iron oxide mixtures as well as their spinels Co(x)Cd(1-x)Fe2O4, with 0 less-than-or-equal-to x less-than-or-equal-to 1, were prepared by calcination at temperatures between 400 and 850-degrees-C. X-ray diffraction and IR spectral studies were used to identify the different phases present in these oxide catalysts. The catalytic activity of these catalysts was investigated kinetically by using the decomposition of H2O2 as a model catalytic process. Maximum activity was observed at x = 1, where Co(II) ions occupy ferrite octahedral lattice sites. For x < 1 values, the observed decrease in catalytic activity is explained in terms of the restricted redox couple represented by M(n)/M(n-1) in the electronic composition of the catalyst and possibly the absence of a more active ion M(n) at x = 0 on the octahedral sites. Correlations were attempted between catalyst compositions and their catalytic activity.
引用
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页码:1642 / 1646
页数:5
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