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Preparation method of CuCo-N/C nano-catalyst and application thereof in preparation of lactic acid by catalytic oxidation of 1,2-propylene glycol

A nano-catalyst and catalyst technology, applied in the field of catalysis, can solve the problems of high cost and limited application expansion, and achieve the effect of energy saving and high application value

Active Publication Date: 2020-09-18
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In previous reports, most of the catalysts used to study 1,2-propanediol were some noble metal catalysts, such as Au, Au-Pd, Au-Pt, etc., although noble metal The catalyst has high catalytic activity and lactic acid selectivity, but its cost is high and its application is limited. Therefore, the development of a green, efficient, and alternative non-noble metal catalyst is still a great challenge in this field!

Method used

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  • Preparation method of CuCo-N/C nano-catalyst and application thereof in preparation of lactic acid by catalytic oxidation of 1,2-propylene glycol
  • Preparation method of CuCo-N/C nano-catalyst and application thereof in preparation of lactic acid by catalytic oxidation of 1,2-propylene glycol
  • Preparation method of CuCo-N/C nano-catalyst and application thereof in preparation of lactic acid by catalytic oxidation of 1,2-propylene glycol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Prepare Regenerated Silk Fibroin Solution (RSF):

[0027] Cut 10 grams of silkworm cocoons into sheets of uniform size, add them to the prepared 0.02M anhydrous sodium carbonate solution and boil for 30 minutes to remove the sericin and wax in the silkworm cocoons to obtain regenerated silk fibroin. Wash the regenerated silk fibroin with deionized water three times and dry naturally at room temperature. Weigh 2.5g of regenerated silk fibroin and add it to 10ml of 9.3M lithium bromide solution, keep it in an oven at 60℃ for 4 hours, after completely dissolving, dialyzed with deionized water for three days to remove lithium bromide, and centrifuge to remove insoluble impurities to obtain regenerated silk Element solution (RSF); the volume of the solution is 40 ml, and the mass concentration of RSF is 5%.

[0028] (2) Preparation of Cu-Co bimetallic nanoparticle colloid:

[0029] 0.415g Cu(NO 3 ) 2 ·2H 2 O, 0.395g Co(NO 3 ) 2 ·6H 2 Dissolve O in 40mL 5% RSF solution, adjust...

Embodiment 2

[0035] (1) Preparation of Regenerated Silk Fibroin Solution (RSF): Step (1) is the same as in Example 1

[0036] (2) Preparation of Cu-Co bimetallic nanoparticle colloid:

[0037] 0.415g Cu(NO 3 ) 2 ·2H 2 O, 0.395g Co(NO 3 ) 2 ·6H 2 Dissolve O in 40mL 5% RSF solution, adjust the pH of the mixed solution to 11.03, after the solution turns purple-blue, stir and react at room temperature for 24h to obtain Cu-Co bimetallic nanoparticle colloid;

[0038] (3) Preparation of CuCo-N / C doped bimetallic nanocatalyst by freeze-drying and carbonization:

[0039] The prepared Cu-Co bimetallic nanoparticle colloid was freeze-dried at -85°C for 4 days, and then removed at 5°C for min -1 The temperature increase rate of the temperature rise is raised to 800°C in a tube furnace and kept for 4 hours, and after cooling, a 10% CuCo-N / C800 doped bimetallic nano-catalyst is obtained.

[0040] (4) Catalytic oxidation reaction of 1,2-propanediol:

[0041] First, the prepared 40mL 0.32mol / L 1,2-propanediol, 0.24...

Embodiment 3

[0043] (1) Preparation of Regenerated Silk Fibroin Solution (RSF): Step (1) is the same as in Example 1

[0044] (2) Preparation of Cu-Co bimetallic nanoparticle colloid:

[0045] 0.415g Cu(NO 3 ) 2 ·2H 2 O, 0.395g Co(NO 3 ) 2 ·6H 2 Dissolve O in 40mL 5% RSF solution, adjust the pH of the mixed solution to 10.86, after the solution turns purple-blue, stir and react at room temperature for 24h to obtain Cu-Co bimetallic nanoparticle colloid;

[0046] (3) Preparation of CuCo-N / C doped bimetallic nanocatalyst by freeze-drying and carbonization:

[0047] The prepared Cu-Co bimetallic nanoparticle colloid was freeze-dried at -85°C for 5 days, and then removed at 5°C for min -1 The temperature rise rate is raised to 1000° C. in a tube furnace and kept for 4 hours, and after cooling, a 10% CuCo-N / C1000 doped bimetallic nano-catalyst is obtained.

[0048] (4) Catalytic oxidation reaction of 1,2-propanediol:

[0049] First, the prepared 40mL 0.32mol / L 1,2-propanediol, 0.24mol / L sodium hydroxide a...

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Abstract

The invention belongs to the technical field of catalysis, and relates to a preparation method of a CuCo-N / C nano-catalyst and application thereof in the preparation of lactic acid by catalytic oxidation of 1,2-propylene glycol. Silk is used as a natural nitrogen-rich carbon precursor; silk is carbonized to form a nitrogen-doped carbon material; the nitrogen content is as high as 9.4%; a CuCo-N active site is formed through the bonding of active elements Cu-Co; the activity of the catalyst is improved, meanwhile, due to the coating effect of a carbon layer, the catalyst has good oxidation resistance, the catalyst shows good catalytic activity and product selectivity in the reaction of preparing lactic acid through catalytic oxidation of 1,2-propylene glycol, and the prepared copper-based nano-catalyst is small in particle, uniform in dispersion and good in catalytic life.

Description

Technical field [0001] The invention belongs to the technical field of catalysis, and relates to a method for preparing a CuCo-N / C nano catalyst and an application of catalytic oxidation of 1,2-propanediol to prepare lactic acid. Background technique [0002] As a commonly used biomass derivative, lactic acid occupies an important position in food processing, drug synthesis, and cosmetic production. It is also used as a monomer to synthesize polylactic acid in the chemical industry. Therefore, the annual global consumption of lactic acid It is increasing year by year. The current methods of synthesizing lactic acid mainly include chemical synthesis, biological fermentation, etc. Biological fermentation mainly uses suitable microorganisms to produce lactic acid in a suitable environment, but it will be accompanied by a large amount of biological sludge, and the reaction rate is relatively low and the cost is high; the same, chemical The synthesis is to react acetaldehyde with HCN...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J37/32B01J37/08B01J37/16C07C59/08C07C51/235
CPCB01J27/24B01J37/32B01J37/084B01J37/16C07C51/235C07C2527/24B01J35/40C07C59/08Y02P20/584
Inventor 卢聪明吕明俊冯永海王慧杰
Owner JIANGSU UNIV
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