A kind of preparation method of propane oxidative dehydrogenation to propylene catalyst

Abstract

The invention relates to a preparation method of a catalyst for oxidative dehydrogenation of propane to propylene. The catalyst includes an active component, a first auxiliary agent, a second auxiliary agent and a carrier; the preparation method of the catalyst first prepares the active component precursor, the first The auxiliary agent precursor is dissolved in water to obtain a solution A; the catalyst precursor B is obtained after adding a carrier, aging, drying, and roasting; the catalyst precursor B is reduced using a reducing atmosphere; the reduced catalyst precursor B is mixed with polyol The solution is added to the reaction kettle for hydrogenation reaction; the reaction effluent is placed, filtered and dried to obtain catalyst precursor C; the active component precursor and the second auxiliary agent precursor are dissolved in water to obtain solution D, and catalyst precursor C is added , after drying and roasting, the catalyst is obtained. The method of the invention promotes the dispersion of more active components on the carrier surface, not only improves the utilization rate of active metals, but also improves the conversion rate of propane and the selectivity of propylene.

Description

technical field [0001] The invention relates to a preparation method of a catalyst for oxidative dehydrogenation of propane to propylene, in particular to a preparation method of a supported nickel-based catalyst for oxidative dehydrogenation of propane to propylene. Background technique [0002] Propylene is an extremely important organic chemical raw material, widely used in the production of a series of important chemical products such as polypropylene, polyacrylonitrile, phenol, oxo alcohol, propylene oxide, acrolein and acrylic acid. [0003] At present, propylene is mainly produced by catalytic cracking of petroleum and catalytic dehydrogenation of propane. The production process of propane catalytic dehydrogenation to propylene is controlled by thermodynamic equilibrium, the reaction conditions are harsh, and there are problems such as rapid deactivation of the catalyst due to carbon deposition. The oxidative dehydrogenation of propane is a new way to prepare propyle...

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Problems solved by technology

[0005] The oxidative dehydrogenation of propane to propylene is still a fast reaction (this kind of fast reaction is generally carried out under the condition of mass transfer control), and the reaction is completed when the reactants reach the outer surface of the catalyst, so the inner surface of the catalyst is relatively The target reaction does not contribute much, which results in lower metal utilization in the pores of the support, increases the cost of the catalyst, and also accelerates the deep oxidation of the product

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