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Application of a nitrogen-doped activated carbon-supported Cu catalyst in the hydrogenation of cinnamaldehyde

A technology of activated carbon and catalyst, which is applied in the field of material preparation, can solve the problems that the conversion rate and selectivity cannot be improved at the same time, and achieve the effect of excellent recovery performance, less loss, and easier reaction

Active Publication Date: 2021-11-02
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that when using non-metallic catalysts such as Cu and Co, although the cost of the catalyst can be reduced, the conversion and selectivity cannot be improved at the same time.

Method used

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  • Application of a nitrogen-doped activated carbon-supported Cu catalyst in the hydrogenation of cinnamaldehyde
  • Application of a nitrogen-doped activated carbon-supported Cu catalyst in the hydrogenation of cinnamaldehyde

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Cu@N-OAC for hydrogenation of cinnamaldehyde

[0033] (1) Take 10g of activated carbon in a 250ml round bottom flask, add 135ml of concentrated nitric acid (65%~68%), and reflux at 120°C for 12h;

[0034] (2) After the reflux is completed, cool to room temperature, filter and wash with deionized water several times until neutral;

[0035] (3) Dry the solid obtained in (2) at 60°C for 12 hours to obtain oxidized activated carbon (OAC);

[0036] (4) Dissolve 0.135g of copper nitrate and 0.2g of glycine in 20ml of water, stir at 50° for 30min, and prepare copper glycinate solution with excess glycine;

[0037] (5) Take 0.5g of the OAC obtained in (3) in the small beaker of (4), and continue to stir at 50° for 3h until the deionized water evaporates to dryness

[0038] (6) Dry at 60°C for 12 hours;

[0039] (7) Grind the solid obtained in (6), and roast it at 600°C, 700°C, and 800°C for 2 h under a nitrogen atmosphere to obtain nitrogen-doped copper oxidation activated c...

Embodiment 2

[0049] Preparation of Catalysts for Hydrogenation of Cinnamaldehyde by Changing the Amount of Glycine

[0050] (1) Take 10g of activated carbon in a 250ml round bottom flask, add 135ml of concentrated nitric acid (65%~68%), and reflux at 120°C for 12h;

[0051] (2) After the reflux is completed, cool to room temperature, filter and wash with deionized water several times until neutral;

[0052] (3) Dry the solid obtained in (2) at 60°C for 12 hours to obtain oxidized activated carbon (OAC);

[0053] (4) 0.135g of copper nitrate and 0g, 0.1g, 0.2g of glycine were dissolved in 20ml of water (No. 1, 2, 3), stirred at 50° for 30min, and made into copper glycinate solution with excess glycine;

[0054] (5) Take 0.5 g of the OACs obtained in (4) in a small beaker, and continue to stir at 50°C for 3 hours until the deionized water evaporates to dryness;

[0055] (6) Dry at 60°C for 12 hours;

[0056] (7) Grinding the solid obtained in (6), and calcining at 700 °C for 2 h under a n...

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Abstract

The invention discloses the application of a nitrogen-doped activated carbon supported Cu catalyst in catalyzing the hydrogenation of cinnamaldehyde. The invention uses the adsorption of activated carbon to glycine and the complexation of glycine to copper ions to indirectly control the size of copper particles and complete the anchoring of copper on the carrier. Then the precursor is roasted at high temperature, glycine is decomposed to form nitrogen-doped activated carbon, and copper is reduced to cuprous and copper simple substances by nitrogen-doped activated carbon. The dissociation energy of hydrogen makes the reaction easier to carry out and significantly improves the conversion rate of cinnamaldehyde. The complexation and nitrogen doping of glycine enabled the conversion and selectivity of cinnamaldehyde hydrogenation to reach a very high level. The catalyst avoids the use of precious metals and heavy metals, is more economical and environment-friendly, and the catalyst preparation process is simple, efficient and easy to popularize.

Description

technical field [0001] The invention relates to the field of material preparation, in particular to the application of a nitrogen-doped activated carbon supported Cu catalyst in catalyzing the hydrogenation of cinnamaldehyde. Background technique [0002] α,β-unsaturated alcohols are important raw materials and intermediates of medicines and spices. Cinnamaldehyde is a typical representative of α,β-unsaturated aldehydes. At present, the methods for industrially producing cinnamyl alcohol mainly include the catalytic hydrogenation of cinnamaldehyde, the reduction of cinnamaldehyde, the ester hydrolysis of styrene chloromethyl, the saponification of sorrel balsam and the improved industrial method. These methods not only have high production costs, but also And pollute the environment. The preparation of cinnamyl alcohol by liquid-phase selective hydrogenation of cinnamaldehyde can overcome the above disadvantages, and is more in line with the requirements of green chemistry...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J23/72C07C33/32C07C29/141
CPCB01J23/72B01J27/24C07C29/141C07C33/32
Inventor 郝芳何世龙刘平乐熊伟熊绍锋
Owner XIANGTAN UNIV
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