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Magnetic gold-cobalt composite catalyst as well as preparation method and application thereof

A composite and catalyst technology, which is applied in the field of magnetic gold-cobalt composite catalyst and its preparation, can solve the problems of polluting the environment and difficult recovery of the catalyst, and achieve the effects of high conversion rate, efficient electron transfer effect and high catalytic efficiency.

Active Publication Date: 2021-08-24
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned catalysts need to be added with HCl acidic additives to have the best catalytic performance, pollute the environment, and the above-mentioned catalysts are not easy to recycle

Method used

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  • Magnetic gold-cobalt composite catalyst as well as preparation method and application thereof
  • Magnetic gold-cobalt composite catalyst as well as preparation method and application thereof
  • Magnetic gold-cobalt composite catalyst as well as preparation method and application thereof

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preparation example Construction

[0038] The present invention provides a preparation method of the magnetic gold-cobalt composite catalyst described in the above technical scheme, comprising the following steps:

[0039] Mixing the water-soluble gold precursor, the water-soluble cobalt precursor, the borohydride salt and water, adjusting the pH value to 5-10, and carrying out the precipitation-reduction reaction in sequence to obtain the catalyst precursor;

[0040] The catalyst precursor is subjected to a hydrogen reduction reaction to obtain a magnetic gold-cobalt composite catalyst.

[0041] In the present invention, unless otherwise specified, all raw material components are commercially available products well known to those skilled in the art.

[0042] In the invention, the water-soluble gold precursor, the water-soluble cobalt precursor, borohydride salt and water are mixed, and the precipitation-reduction reaction is carried out to obtain the catalyst precursor.

[0043] In the present invention, the...

Embodiment 1

[0066] use figure 1 The preparation flow chart shown prepares magnetic gold-cobalt composite catalyst;

[0067] (1) Add 1 mL of HAuCl with a concentration of 5 mg / mL 4 4H 2 O solution and 0.5g Co(NO 3 ) 2 ·6H 2 O was placed in a 250mL round-bottomed flask, added 50mL deionized water and stirred for 15min, then added dropwise the newly prepared NaBH with a concentration of 1mg / mL 4 Aqueous solution to a pH value of 10, under the condition of avoiding light and stirring for precipitation-reduction reaction for 2 hours, suction filtration, suction filtration and washing with 1.5L deionized water at a temperature of 90°C until the filtrate is a colorless transparent liquid, and then placed in an oven at 80°C dry in medium for 12 hours to obtain the catalyst precursor; wherein, the filter membrane used for suction filtration is an organic phase filter membrane with a specification of 50mm×0.08μm~50mm×0.2μm;

[0068] (2) The catalyst precursor was subjected to a hydrogen reduc...

Embodiment 2

[0070] Prepare the magnetic gold-cobalt composite catalyst according to the method of Example 1, the difference from Example 1 is that HAuCl in step (1) 4 4H 2 The volume of the O solution is 2mL, and the magnetic gold-cobalt composite catalyst (abbreviated as 3%Au-Co / CoO x , where x=1.25).

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Abstract

The invention provides a magnetic gold-cobalt composite catalyst and a preparation method and application thereof, and belongs to the technical field of catalysts. The magnetic gold-cobalt composite catalyst provided by the invention comprises a magnetic cobalt oxide carrier and a gold-cobalt alloy loaded on the surface of the magnetic cobalt oxide carrier, and the chemical composition of the magnetic cobalt oxide carrier is CoOx, wherein x is more than 1 and less than 1.5. In the catalyst provided by the invention, gold and cobalt in the gold-cobalt alloy generate a metal synergistic effect; CoOx has a large number of surface defects and provides a large number of reaction active sites; and the magnetic cobalt oxide carrier and the gold-cobalt alloy active component have strong interaction, so that the catalytic activity of the catalyst for preparing 2,5-dimethylfuran through hydrogenation of 5-hydroxymethylfurfural is improved, the conversion rate of 5-hydroxymethylfurfural is high, and the yield and selectivity of 2,5-dimethylfuran are high.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a magnetic gold-cobalt composite catalyst and its preparation method and application. Background technique [0002] The exploitation and combustion of non-renewable fossil raw materials such as coal, oil and natural gas lead to increasingly serious problems such as environmental pollution and global warming. The shortage of energy and the deterioration of the environment restrict the development and survival of human society. In recent years, the real pressure of environmental pollution and energy shortage has prompted researchers all over the world to search for new green and renewable new energy sources. Among all new energy sources (such as solar energy, wind energy, water energy, and biomass energy), biomass is the only renewable organic carbon energy source, which is expected to replace non-renewable fossil resources. Moreover, the huge reserves of biomass in nature are s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/36B01J23/89B01J37/18B01J37/03
CPCC07D307/36B01J23/8913B01J37/18B01J37/031B01J35/33B01J35/23Y02P20/584
Inventor 方文浩王英浩曹秋娥
Owner YUNNAN UNIV
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