Cobalt-based catalyst as well as preparation method and application thereof to synthesis of 3-hydroxycarboxylate

A cobalt-based catalyst, hydroxycarboxylate technology, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of difficult preservation, easy decomposition of catalysts, etc. The effect of easy separation, recovery and recycling, and simple preparation method

Active Publication Date: 2018-08-10
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The main purpose of the present invention is to provide a cobalt-based catalyst and its preparation method to solve the technical defects of existing catalysts such as easy decomposition, difficult storage and stability in use.

Method used

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  • Cobalt-based catalyst as well as preparation method and application thereof to synthesis of 3-hydroxycarboxylate
  • Cobalt-based catalyst as well as preparation method and application thereof to synthesis of 3-hydroxycarboxylate

Examples

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preparation example Construction

[0042] Another aspect of the embodiments of the present invention provides a method for preparing a cobalt-based catalyst, which includes:

[0043] Make the mixed reaction system containing cobalt source, carbon-nitrogen precursor and solvent react at 25-80°C for 0.5-2h, add porous material, and then bake at 550-900°C for 2-3h in a protective atmosphere to obtain cobalt-based catalyst.

[0044]Further, the preparation method may include: mixing and dissolving the cobalt source and the carbon-nitrogen precursor in ethanol, heating and stirring, then adding the porous material and continuing to stir, after the ethanol is evaporated to dryness, grind it into fine powder and put it into an atmosphere furnace for roasting.

[0045] In some embodiments, the preparation method specifically includes:

[0046] (1) Uniformly mix the cobalt source and the solvent to form a cobalt source solution, then add the carbon-nitrogen precursor, make the obtained mixed reaction system react at 25...

Embodiment 1

[0087] The preparation method of the cobalt-based catalyst of the present embodiment is as follows:

[0088] Weigh 1.268g Co(OAc) 2 4H 2 O was dissolved in 200ml of ethanol, then 1.82g of 1,10-phenanthroline was added, heated to 60°C and kept at a constant temperature for 1 hour, after cooling down, 6.91g of silicon dioxide was added and stirred for 16 hours. The prepared mixed system was evaporated to dryness with a rotary evaporator, and then the solid phase part was continued to be vacuum-dried at 60 °C, ground and then roasted at 800 °C for 2 hours in an Ar atmosphere to obtain a cobalt-based catalyst (named as catalyst 1).

Embodiment 2

[0090] The preparation method of this example is basically the same as that of Example 1, except that 1,10-phenanthroline in Example 1 is replaced with 0.68 g of imidazole, and the temperature is raised to 25° C. and kept at a constant temperature for 2 hours. The cobalt-based catalyst prepared in this example is named catalyst 2.

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Abstract

The invention discloses a cobalt-based catalyst as well as a preparation method and application thereof to synthesis of 3-hydroxycarboxylate. The cobalt-based catalyst comprises: nano metal cobalt which is used as a main active component, a porous material which is used as a composite carrier, and a nitrogen-doped carbon material, wherein the nano metal cobalt is uniformly loaded on the porous material; the surface of the nano metal cobalt is coated with the nitrogen-doped carbon material. The preparation method comprises the following steps: enabling a mixed reaction system containing a cobalt source, a carbon-nitrogen precursor and a solvent to react at 25 to 80 DEG C for 0.5 to 2h, and adding the porous material; then roasting at 550 to 900 DEG C for 2 to 3h in a protective atmosphere to obtain the cobalt-based catalyst. The cobalt-based catalyst provided by the invention has stable structure and properties and high reaction activity and 3-hydroxycarboxylate selectivity; the cobalt-based catalyst has the advantages that the preparation method is simple, the catalyst is easy to separate and recycle after reaction, the catalytic property of the catalyst is not reduced after the catalyst is repeatedly used for a plurality of times and the like, so that the catalyst is more suitable for industrial amplified application.

Description

technical field [0001] The present invention relates to a cobalt-based catalyst, in particular to a cobalt-based catalyst for synthesizing 3-hydroxycarboxylates by catalyzing hydroesterification of epoxy compounds and a preparation method thereof, and its use in synthesizing 3-hydroxycarboxylates The application in the invention belongs to the technical field of oxo synthesis reaction. Background technique [0002] 3-Hydroxycarboxylates (β-hydroxycarboxylates) are important intermediates in the industrial production of high value-added chemicals, which can further produce 1,3-diols, α,β-unsaturated esters and biodegradable thermoplastics Poly-β-hydroxyalkanoate can also be directly used as a drug to treat various diseases such as Alzheimer's disease and Parkinson's disease. At present, there are multiple methods for synthesizing β-hydroxyalkanoate, among which the catalyzed ring-opening carbonylation (hydroesterification) method of epoxy compounds has received great attenti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J37/08C07C69/675C07C67/37
CPCB01J27/24B01J35/0013B01J37/086C07C67/37C07C69/675
Inventor 何林曾波夏春谷陈林曹彦伟张雪华吴海洪
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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