Dimethyl benzyl alcohol hydrogenolysis catalyst and preparation method thereof

Abstract

The invention discloses a dimethyl benzyl alcohol hydrogenolysis catalyst and a preparation method thereof. The catalyst comprises 35-70wt% of copper oxide, 5-25wt% of zinc oxide, 15-40wt% of silicondioxide, 0.5-15wt% of alkaline earth metal oxide and 0.1-5wt% of bismuth oxide and lead oxide. The preparation method comprises the following steps: (a) adding a mixed solution containing a Cu compound, a Zn compound, an alkaline earth metal compound, a Bi compound and a Pb compound and an alkaline precipitant solution into a silica sol aqueous solution for precipitation reaction and heating aging; (b) filtering, washing, drying and roasting the aged slurry to obtain complex compound powder; and (c) adding a binder, a forming assistant and the like into the complex compound powder, fully mixing, extruding and forming, drying and roasting to obtain the catalyst. When used for preparing cumene by hydrogenolysis of dimethylbenzyl alcohol, the method not only has good activity and selectivity,but also has good liquid resistance and high mechanical stability.

Description

technical field [0001] The invention belongs to the technical field of catalysis, and in particular relates to a dimethyl benzyl alcohol hydrogenolysis catalyst and a preparation method thereof. Background technique [0002] Propylene oxide (PO) is an important organic chemical raw material, mainly used in the production of polyether polyol (polyurethane raw material), propylene glycol, etc. developer etc. [0003] Industrial PO production methods mainly include chlorohydrin method, hydrogen peroxide direct oxidation method and co-oxidation method (Halcon method). The chlorohydrin method is the main route for producing PO in China. This process has serious problems such as equipment corrosion and environmental pollution. Due to the high raw material cost of the direct hydrogen peroxide oxidation route, the economy is affected. [0004] The co-oxidation method, also known as co-production method or indirect oxidation method, is to generate propylene oxide through the react...

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Problems solved by technology

[0007] The hydrogenolysis catalysts of dimethyl benzyl alcohol mainly include platinum-palladium precious metal catalysts, nickel-based catalysts and copper-based catalysts, etc., the cost of noble metal catalysts and nickel-based catalysts is high, and it is easy to cause Saturated aromatic ring, poor selectivity to cumene

[0018]The active center of the copper-based catalyst is the reduced metal copper grains. Because the melting point of metal copper is relatively low, the growth of copper grains and the Sintering will directly lead to a reduction in the number of active sites of the catalyst and a decrease in catalyst activity

The decrease in hydrogenolysis activity will induce side reactions such as polymerization, which will cause the active site of the catalyst to be covered by the polymer and the carrier pores to be blocked by the polymer, resulting in a decrease in the activity and stability of the catalyst.

[0019] In the prior...

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