Preparation of confinement structure ruthenium-nickel core-shell bimetallic nano-catalyst and application thereof in catalyzing dimethyl terephthalate selective hydrogenation

Abstract

The invention discloses preparation of a confinement structure ruthenium-nickel core-shell bimetallic nano-catalyst and application thereof in catalyzing dimethyl terephthalate selective hydrogenation. The structure of the catalyst is that Ru@Ni core-shell metal nanoparticles are uniformly embedded in a weakly crystallized aluminium-doped nickel metallic oxide shell, and peripheral aluminium-dopednickel metallic oxide has a confinement effect on the Ru@Ni core-shell metal nanoparticles. The preparation method comprises the steps that a NiAlRu ternary hydrotalcite precursor is synthesized through a double drop method, then temperature-programmed reduction is applied in a hydrogen atmosphere, and the confinement structure ruthenium-nickel core-shell bimetallic nano-catalyst is obtained. Ina dimethyl terephthalate selective hydrogenation reaction, by means of the catalyst, not only is the conversion rate of dimethyl terephthalate is improved, but also the selectivity of dimethyl 1,4-cyclohexanedicarboxylate is greatly improved, the outstanding reaction stability is achieved, and thus the reaction performance of hydrogenation is improved.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to the preparation of a ruthenium-nickel core-shell bimetallic nano-catalyst with a confined domain structure and its application in catalyzing the selective hydrogenation of dimethyl terephthalate. Background technique [0002] Dimethyl 1,4-cyclohexanedicarboxylate (DMCD) is a valuable chemical intermediate, which can be further hydrogenated to prepare 1,4-cyclohexanedicarboxylate with wide application value. Methanol (Dimethyl 1,4-cyclohexanedimenthanol, CHDM for short) intermediate itself can also be used as a monomer of polyester resin. In addition, DMCD also has a great use in coatings. In industry, dimethyl terephthalate (Dimethyl terephthalate, referred to as DMT) is used as raw material to prepare DMCD by hydrogenation, and the supported noble metal Pd-based catalyst is used. Although it has good activity and selectivity, the reaction conditions are...

AI Technical Summary

Problems solved by technology

In industry, dimethyl terephthalate (Dimethyl terephthalate, referred to as DMT) is used as raw material to prepare DMCD by hydrogenation, and the supported noble metal Pd-based catalyst is used. Although it has good activity and selectivity, the reaction conditions are relatively harsh. (The reaction temperature is 160-180°C, the hydrogen pressure is 30-48Mpa), and the price is expensive, which is not conducive to the development of industrialization

Therefore, researchers are currently focusing on non-precious metal Ni-based catalysts. Although the Ni-based catalysts prepared by the traditional impregnation method are simple in process, their dispersion is poor and they are easy to aggregate, resulting in poor catalyst activity and life.

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