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Porous carbon aerogel catalyst, and preparation method and application thereof

An airgel and catalyst technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as transition metal diffusion barriers, reduced catalyst performance, and uneven distribution of transition metals. low, good substrate applicability, and easy separation and recovery

Active Publication Date: 2018-11-06
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the porous carbon or airgel used above has pores, the pores will hinder the diffusion of transition metals during impregnation, which will lead to uneven distribution of transition metals on the porous carbon, thereby reducing the performance of the catalyst.

Method used

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  • Porous carbon aerogel catalyst, and preparation method and application thereof
  • Porous carbon aerogel catalyst, and preparation method and application thereof
  • Porous carbon aerogel catalyst, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] This embodiment provides porous carbon airgel Mn prepared at different carbonization temperatures 3 o 4 / CA-600, Mn 3 o 4 / CA-700, Mn 3 o 4 Preparation method of / CA-800 catalyst:

[0046] (1) Preparation of hydrogel

[0047] Dissolve 2g of cellulose in 50g of sodium hydroxide / urea solution (the mass fractions of sodium hydroxide and urea are 7wt.% and 12wt.% respectively), under the stirring condition of 2000rpm, form a homogeneous transparent solution, then add 3.65 A saturated solution of manganese acetate in mmol was sealed and placed in an oven at 50°C for 12 hours to prepare a cellulose hydrogel containing transition metal hydroxide nanoparticles, sodium hydroxide and urea.

[0048] (2) Preparation of airgel

[0049] After the cellulose hydrogel was freeze-dried at -80°C for 24 hours, the cellulose aerogel containing transition metal hydroxide nanoparticles, sodium hydroxide and urea was obtained.

[0050] (3) Carbonization of airgel

[0051] The cellulos...

Embodiment 2

[0057] The present embodiment provides the obtained porous carbon airgel Mn in embodiment 1 3 o 4 Application of / CA-700 catalyst:

[0058] Blank control: Mix 0.5mmol furfural and 5mL isopropanol evenly, seal it in a 10mL high-pressure hydrothermal reactor, place it in an oven at 160°C for 3 hours, cool the room to room temperature, filter to obtain a liquid mixture, and take a sample for gas phase analysis. Analysis showed that the conversion rate of furfural was 5.1%, and the selectivity of furfuryl alcohol was 3.5%.

[0059] Catalytic application: Weigh 0.5mmol aldehydes, ketones or levulinic acid ester reactants, 5mL isopropanol and 50mg Mn obtained in Example 1 3 o 4 / CA-700 mixed evenly, sealed in a 10mL high-pressure hydrothermal reactor, placed in an oven at 160°C for a certain period of time, filtered to obtain a liquid mixture, and sampled for gas phase analysis to obtain the conversion rate of reactants and product alcohols Or the selectivity of esters, specific...

Embodiment 3

[0064] This embodiment provides a porous carbon airgel Co 3 o 4 Preparation method and application of / CA-700 catalyst:

[0065] co 3 o 4 Preparation of / CA-700 catalyst: replace manganese acetate saturated solution with cobalt nitrate saturated solution, all the other preparation steps are the same as embodiment 1.

[0066] co 3 o 4 Application of / CA-700 catalyst: Weigh 0.5mmol furfural, 5mL isopropanol and 50mgCo 3 o 4 / CA-700 catalyst mixed evenly, sealed in a 10mL high-pressure hydrothermal reaction kettle, placed in an oven at 160°C for 3 hours, cooled to room temperature, filtered to obtain a liquid mixture, sampled for gas phase analysis, and the conversion rate of furfural was 98%. %, the selectivity of furfuryl alcohol is 87%.

[0067] Using TEM to analyze the microscopic morphology of the obtained catalyst, the results are as follows: figure 2 with image 3 As shown, it can be seen that the transition metal particles are uniformly dispersed on the porous ...

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Abstract

The invention belongs to the technical field of preparation of catalysts, and concretely relates to a porous carbon aerogel catalyst, and a preparation method and an application thereof. The method comprises the following steps: dissolving cellulose under a high-speed stirring condition, mixing the dissolved cellulose with a transition metal salt solution, and sequentially solidifying, drying, carbonizing and washing the obtained mixed solution to simultaneously achieve the preparation of aerogel and the loading of a transition metal in order to obtain the porous carbon aerogel with highly dispersed catalyst active sites. The catalyst has a good stability and a high catalytic activity, and can efficiently catalyze the transfer hydrogenation reaction of aldehydes, ketones or levulinates andalcoholic organic substances, wherein the conversion rate of aldehydes to alcohols reaches up to 98-100%, and the selectivity of alcohols reaches up to 81-99%. The catalyst is a solid aerogel monolith catalyst, so the catalyst can be well dispersed in a solution without stirring, and is easy to separate and recover. Additionally, the catalyst adopts cellulose as a raw material, so the catalyst has the advantages of low cost, greenness, environmental protection, renewability, simple preparation process, and easiness in industrialization.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a porous carbon airgel catalyst and its preparation method and application. Background technique [0002] Furfural is an important class of renewable biomass platform molecules that can be used as starting materials to produce various high value-added furan derivatives through catalytic conversion, as well as additives for the production of liquid alkanes and fuels. Among them, furfuryl alcohol is one of the most attractive products. As an important chemical raw material, furfuryl alcohol is mainly used in the production of thermostatic resins, corrosion-resistant hybrid concrete, etc. It is also widely used as a solvent and an important intermediate, such as adhesives and wetting agents. The hydrogenation reduction of furfural to prepare furfuryl alcohol is difficult to occur under mild conditions, and the catalyst plays a key role in the conversion of ...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01J23/22B01J23/34B01J23/72B01J23/75B01J23/755B01J27/24B01J35/00B01J35/10B01J37/08C07B41/02C07D307/44
CPCC07B41/02C07D307/44B01J21/066B01J23/22B01J23/34B01J23/72B01J23/75B01J23/755B01J27/24B01J37/084B01J35/394B01J35/23B01J35/615B01J35/617B01J35/633B01J35/635B01J35/647
Inventor 祁海松周生辉陈贵娴冯晓王明
Owner SOUTH CHINA UNIV OF TECH
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