A high-stability boron-based catalyst, a preparation method thereof and application thereof in propane oxidative dehydrogenation

Abstract

This invention provides a highly stable boron-based catalyst, its preparation method, and its application in the oxidative dehydrogenation of propane. The catalyst has a gradient multi-interface structure with a gradual change in composition from the surface to the bulk phase, including an outer layer of amorphous boron. x Transition layer amorphous REB x O y And the inner crystalline rare earth metaborate REB3O6, with BO as the active center x The catalyst, prepared from REB6 precursor via a controlled high-temperature oxidation process, features a uniformly distributed outer layer of amorphous boron-oxygen species as active centers. The synergistic anchoring effect of the gradient interfaces significantly enhances the hydrolysis resistance of these active species. This structure effectively suppresses boron loss and improves the catalytic stability of propane oxidative dehydrogenation under an aqueous reaction atmosphere. This catalyst exhibits both excellent olefin selectivity and superior long-term stability, demonstrating promising prospects for industrial applications.

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