Dimethylbenzyl alcohol hydrogenolysis catalyst as well as preparation method and application thereof

Abstract

The invention provides a dimethyl benzyl alcohol hydrogenolysis catalyst and a preparation method and application thereof.The active components of the dimethyl benzyl alcohol hydrogenolysis catalyst comprise Pd, Ru, Cu and Ni, Pd and Ru in the active components are highly dispersed on the surface layer of the catalyst, side reactions such as excessive hydrogenation are inhibited, and the catalytic activity of the catalyst is improved. The dimethyl benzyl alcohol diffused into the pore channel of the catalyst can be subjected to hydrogenolysis reaction under the catalysis of Cu and Ni to generate isopropyl benzene, but is difficult to further hydrogenate to generate a byproduct isopropyl cyclohexane; a carrier of the dimethyl benzyl alcohol hydrogenolysis catalyst is a composite carrier comprising ZnO, SiO2 and Al2O3, so that the efficient hydrogenolysis catalyst with highly dispersed active components, reliable strength and moderate acidity can be obtained; the dimethyl benzyl alcohol hydrogenolysis catalyst has the advantages of being high in active component dispersity, smooth in catalyst pore channel and the like, and has excellent activity and selectivity when being used for preparing isopropyl benzene through dimethyl benzyl alcohol hydrogenolysis.

Description

technical field [0001] The invention relates to the technical field of hydrogenolysis catalysts, in particular to a dimethylbenzyl alcohol hydrogenolysis catalyst and a preparation method and application thereof. Background technique [0002] Industrial production of propylene oxide (PO) mainly includes chlorohydrin method, direct oxidation of hydrogen peroxide and co-oxidation method (Halcon method). Chlorohydrin method is the main route for producing PO at present, and this process has serious problems such as equipment corrosion and environmental pollution. Due to the high cost of raw materials, the direct oxidation route of hydrogen peroxide is economically affected. The co-oxidation method is to generate propylene oxide by the reaction of organic peroxide and propylene. Although the traditional isobutane co-oxidation method and ethylbenzene co-oxidation method avoid the serious environmental pollution caused by the chlorohydrin method with high investment and long pro...

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Problems solved by technology

[0011] Patent CN112569930A discloses a preparation method of cumene and the obtained cumene. In this patent, Pd and carbon-containing precursors are loaded on the alumina carrier, and the residual carbon content after roasting is <1.5%, and the Pd loading is 0.5%. , the cost of the catalyst is higher

In addition, the patent does not mention the molding method of the catalyst and the state of the catalyst particles after the reaction

[0012] When conventional noble metal catalysts are used in the hydrogenolysis reaction of dimethyl benzyl alcohol, there are disadvantages such as high catalyst cost, easy to cause aromatic ring saturation, and poor selectivity of cumene; nickel-based and copper-based catalysts have low activity, poor selectivity, and easy sintering And the catalyst has the disadvantages of poor liquid resistance

[0013] At present, the catalysts prepared by the prior art are used for the catalytic hydrogenolysis of dimethyl benzyl alcohol to prepare cumene, and there are high loads of noble metals such as Pt / Pd, low activity, poor selectivity, poor high temperature stability, poor liquid resistance and serious environmental pollution

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