Preparation method of catalyst for isobutylene preparation through oxidative dehydrogenation of isobutane

Abstract

The present invention relates to a preparation method of a catalyst for isobutylene preparation through oxidative dehydrogenation of isobutane, wherein the catalyst comprises a first active component, a second active component, a first auxiliary agent, a second auxiliary agent and a carrier. The preparation method comprises: preparing a catalyst precursor A, and reducing the catalyst precursor A; dissolving an auxiliary agent precursor in water, and uniformly mixing with a furfural aqueous solution; adding the obtained mixture and the catalyst precursor A to a high pressure reaction kettle, adding a solution C, and carrying out a reaction; and treating and separating the obtained solid-liquid mixture, filtering the obtained solid sample, drying, and calcining to obtain the catalyst. According to the present invention, the waste residue oil hydrotreating catalyst is completely utilized so as to save the cost; and the prepared catalyst has characteristics of high reaction activity, metal consumption reducing, and isobutylene selectivity improving.

Description

technical field [0001] The invention relates to a preparation method of a catalyst for preparing isobutene by oxidative dehydrogenation of isobutane, in particular to a preparation method of a supported catalyst for preparing isobutene by oxidative dehydrogenation of isobutane. Background technique [0002] With the development of petrochemical technology, isobutene has become the most important basic chemical raw material in olefins except ethylene and propylene. The development of downstream products that use isobutene as a resource has led to a rapid increase in my country's demand for isobutene. [0003] Isobutane is mainly derived from the petroleum catalytic cracking production process. With the increasing demand of refineries to maximize economic benefits, the project of producing isobutene from isobutane has attracted extensive attention. At present, isobutene is mainly produced by catalytic dehydrogenation of isobutane in industry. The method for preparing isobute...

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Problems solved by technology

[0006] However, in the presence of oxygen, the target product of isobutane oxidative dehydrogenation reaction and isobutane are prone to deep oxidation, resulting in waste of raw materials and low selectivity of target products.

The reaction of isobutane oxidative dehydrogenation to isobutene is also 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 reactant reaches the outer surface of the catalyst, so the inner surface of the catalyst Does not contribute much to the target reaction, which results in lower metal utilization in the pores of the carrier, increases catalyst cost, and accelerates deep oxidation of the product

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