| Popis: |
The preparation of titania- and zirconia-supported dehydrogenation catalysts using pre-shaped supportbodies was investigated. Catalysts containing only iron and catalysts containing a potassium additive were prepared using simple salt and chelating agent precursors. The effect of the drying time on the were prepared using simple salt and chelating agent precursors. The effect of the drying time on the distribution of the active components was studied. Catalysts were characterized using microscopic techniques, XRD, TPR, magnetic analysis, DRIFTS, XPS, Mossbauer Spectroscopy, and by the catalytic dehydrogenation of 1-butene. It was possible to prepare catalysts showing a good interaction of the active components with the supportwith a uniform distribution over the support pellets. This interaction proved detrimental with titania-supported catalysts, which deactivate rapidly due to the formation of mixed compounds of iron and/or potassium with the support. Zirconia-supported catalysts, however proved to be very stable in the dehydrogenation reaction, which was attributed to the formation of a finely divided supported phase. |
