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

A bimetallic nanometer and metal nanoparticle technology, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, organic compound preparation, hydroxyl compound preparation, etc., can solve the problem of poor catalyst activity and life, harsh reaction conditions, and price Expensive and other issues, to achieve the effect of improving conversion rate, simple method, and improving reaction performance

Active Publication Date: 2019-08-09
BEIJING UNIV OF CHEM TECH
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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.

Method used

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

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Embodiment 1

[0019] A. Preparation of NiAlRu-LDH: Weigh 12.79g of Ni(NO 3 ) 2 ·6H 2 O and 8.25g of Al(NO 3 ) 2 9H 2 O was dissolved in 77mL of deionized water and added to 23mL with a molar concentration of 0.00241mol·mL -1 RuCl 3 Salt solution, prepared as a Ni / Al molar ratio of 2, Ni / Ru molar ratio of 100 mixed salt solution; Weigh 5.49g of sodium hydroxide and 6.06g of sodium carbonate into 130mL of deionized water, ultrasonically dissolved to obtain a mixed alkali solution. Measure 100 mL of deionized water into the synthesis system. At room temperature, the mixed salt solution and the mixed alkali solution were added dropwise to a four-necked flask filled with 100 mL deionized water through a double-channel micro-injection pump, and the dropping rate of the salt solution was 20 mL h -1 , maintain a constant pH = 10, and crystallize at 120°C for 24h. Then wash with deionized water at about 60°C until neutral, and finally dry at 70°C for 24 hours to obtain a highly dispersed hy...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B82Y30/00B82Y40/00C07C29/149C07C35/14
CPCB01J23/892B01J23/002B82Y30/00B82Y40/00C07C29/149C07C2601/14B01J35/396C07C35/14
Inventor 张法智贾会敏运学海
Owner BEIJING UNIV OF CHEM TECH
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