Abstract
Antimony oxide dispersed on Ti02 was characterized using FTIR, Raman, and Auger spectroscopies as well as XRD. They indicate that the electronic environment about Sb is perturbed at low concentration suggesting that the structure of Sb oxide on TiOr is somewhat distorted as compared to Sb60t3. The oxidation of labeled propene such as CHr==CH--CD,, ‘%ZHFCH-CH~, and cisCHD==CD-CH, was examined on Sb,O,, and Sb-Ti oxide catalysts. The results indicate that the first hydrogen abstraction is rate determining and that there is little or no isotope effect in the second hydrogen abstraction over Sb and Sb-Ti oxide catalysts. The oxidation kinetics was discussed on the basis of a modified redox mechanism. The reduction step was promoted by a factor of ca. 50 over Sb oxide dispersed on TiOr as compared to that on unsupported Sb60,,. Rate promotion was mainly attributed to the increase in the amount of active sites for the reduction step.
Published Version
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