Structure of multicomponent oxide catalyst for oxidative butene dehydrogenation

Abstract

Three samples of a catalyst with general formula Mo 12Ni 4.5Co 4Fe 1Bi 1P 0.08Tl 0–0.6O 47.7–48.0Si 15, which exhibits high activity and selectivity for oxidative butene dehydrogenation, have been studied by X-ray analysis, ESR, ir, and diffuse-reflectance spectroscopy. Molybdates of the elements represented in the composition are shown to be present. In the catalyst containing 0.6 atom fraction T1, which displays the maximum activity and selectivity, changes in the structure have been established. It is found that part of Mo 6+ and Fe 3+ ions are reduced to a lower valence state in the deactivated catalyst samples.