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Cobalt-based catalyst, its preparation method and its application in the 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. Easy separation, recovery and recycling, suitable for industrial scale-up applications

Active Publication Date: 2020-09-04
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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, its preparation method and its application in the synthesis of 3-hydroxycarboxylate
  • Cobalt-based catalyst, its preparation method and its application in the 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, its preparation method and its application in synthesizing 3-hydroxycarboxylate. The cobalt-based catalyst includes: nano-metal cobalt as the main active component, a porous material as a composite carrier, and a nitrogen-doped carbon material, wherein the nano-metal cobalt is uniformly loaded on the porous material, and the nitrogen-doped carbon The material is coated on the surface of nano metal cobalt. The preparation method includes: reacting the mixed reaction system containing cobalt source, carbon-nitrogen precursor and solvent at 25-80°C for 0.5-2h, adding porous material, and then calcining at 550-900°C in a protective atmosphere for 2 hours. ~3h, cobalt-based catalyst was obtained. The cobalt-based catalyst of the present invention has stable structure and properties, high reactivity and 3-hydroxycarboxylate selectivity; and has the advantages of simple preparation method, easy separation and recovery of the catalyst after the reaction, and repeated repetition without reducing its catalytic performance. Suitable for industrial amplification applications.

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 Patents(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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