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Preparation method and application of monatomic catalyst for synthesizing dimethyl 1,2-cyclohexanedicarboxylate from dimethyl phthalate

A technology of dimethyl cyclohexanedicarboxylate mono and dimethyl phthalate, which is applied in the preparation of carboxylate, molecular sieve catalyst, catalyst carrier, etc., can solve the problem of easy agglomeration, loss and atom utilization of metal active components low rate issues

Pending Publication Date: 2021-11-23
RUNTAI CHEM TAIXING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aiming at the shortcomings of the existing metal active components of hydrogenation catalysts mentioned in the background technology, which are easy to agglomerate and lose, and the utilization rate of atoms is low, the present invention uses nitrogen-doped carbon nanotubes as a carrier and prepares Pd or Ni or Ru by impregnation method. / Nitrogen-doped carbon nanotube single-atom catalyst

Method used

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  • Preparation method and application of monatomic catalyst for synthesizing dimethyl 1,2-cyclohexanedicarboxylate from dimethyl phthalate
  • Preparation method and application of monatomic catalyst for synthesizing dimethyl 1,2-cyclohexanedicarboxylate from dimethyl phthalate
  • Preparation method and application of monatomic catalyst for synthesizing dimethyl 1,2-cyclohexanedicarboxylate from dimethyl phthalate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Preparation of nitrogen-doped carbon nanotube support

[0023] A small porcelain boat equipped with a certain amount of 0.5g Fe / SBA-15 molecular sieve catalyst was placed in a tube furnace, fed with nitrogen at a flow rate of 60ml / min, and heated to 800°C for half an hour. Then feed the mixture of argon and diethylamine at a flow rate of 20 mL / min, and keep it for a period of time to obtain a black powder. Keep it at 800°C for 2 hours, then soak the black powder in 2mol / L hydrofluoric acid solution for 5 hours to remove the catalyst, finally wash it with deionized water until neutral, and dry it at 70°C to obtain pure nitrogen-doped nanocarbon Tube.

[0024] (2) Preparation of single-atom catalysts

[0025] Disperse the nitrogen-doped carbon nanotubes prepared in step (1) in deionized water, the solid-to-liquid ratio of the nitrogen-doped carbon nanotubes and deionized water is 1:100, stir magnetically in an ultrasonic bath at room temperature for 1 h, and in the ...

Embodiment 2

[0029] In Example 1, the consumption of palladium chloride is changed into 3% of the mass of the carrier based on the mass of palladium atoms.

[0030] Other operations are the same as in Example 1.

Embodiment 3

[0032] In embodiment 1, the consumption of palladium chloride is changed to calculate according to the mass of palladium atom being 7% of carrier mass.

[0033] Other operations are the same as in Example 1.

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Abstract

The invention belongs to the field of preparation of catalysts, and particularly relates to a preparation method and application of a monatomic catalyst for synthesizing dimethyl 1,2-cyclohexanedicarboxylate from dimethyl phthalate. Nitrogen-doped carbon nanotubes prepared by an improved chemical vapor deposition method are used as a carrier; and the M / nitrogen-doped carbon nanotube monatomic catalyst (M=Pd, Ni, Ru) is prepared by an impregnation method. The preparation method is simple, and the M / nitrogen-doped carbon nanotube monatomic catalyst has the advantages of large specific surface area, high mechanical strength, small mass transfer limit, more uniform dispersion of metal active components on the surface of the carrier and the like, has high atom utilization rate and longer service life, and is used for hydrogenation synthesis reaction of dimethyl 1,2-cyclohexanedicarboxylate from dimethyl phthalate, and the reaction activity of the catalyst and the selectivity of the dimethyl 1,2-cyclohexanedicarboxylate are obviously improved.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a preparation method and application of a single-atom catalyst for synthesizing 1,2-cyclohexanedicarboxylate dimethyl from dimethyl phthalate. Background technique [0002] A plasticizer is a substance added to a polymer system that can significantly enhance the plasticity of the polymer system. Plasticizers are usually non-volatile, high-boiling liquid organic compounds, and only a few are low-melting compounds. The largest amount of plasticizers is phthalate plasticizers, accounting for more than 90% of the amount of plasticizers. Studies have shown that phthalate plasticizers can trigger the proliferation of peroxisomes, thereby inducing liver tumors. When phthalate plasticized products are in contact with lipophilic liquids, they are prone to migration and leaching in plastic products. Therefore, in recent years, the use of phthalate plasticizers in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J21/18B01J32/00B01J29/04C07C67/303C07C69/75
CPCB01J27/24B01J21/185B01J29/044C07C67/303B01J2229/186C07C2601/14C07C69/75
Inventor 韩伟卢小松张世元
Owner RUNTAI CHEM TAIXING CO LTD
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