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Method for preparing Co/3DNG catalyst and applying Co/3DNG catalyst to catalytic oxidation of lignin and beta-O-4 model compound thereof

A technology of 3DNG and catalyst, applied in the application field of oxidative transformation of lignin and its β-O-4 model compound

Active Publication Date: 2021-09-14
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, without adding K 2 CO 3 Under the conditions of β-O-4 model compound conversion rate and phenol yield is only 19%

Method used

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  • Method for preparing Co/3DNG catalyst and applying Co/3DNG catalyst to catalytic oxidation of lignin and beta-O-4 model compound thereof
  • Method for preparing Co/3DNG catalyst and applying Co/3DNG catalyst to catalytic oxidation of lignin and beta-O-4 model compound thereof

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Embodiment 1

[0032] This embodiment specifically includes the following steps:

[0033] Step 1. Add 20mL, 2mg / mL GO dispersion into a 40mL hydrothermal kettle, and then measure 0.5mL NH 3 ·H 2 O was added to the GO dispersion and stirred thoroughly for 5 min. Then, the reaction kettle was transferred to an oven, heated to 180° C., and kept at this temperature for 12 hours. After the reaction is finished and the reaction kettle is naturally cooled, the product system is centrifuged, washed with deionized water until neutral pH = 7, and stored in deionized water for future use. The resulting product was named 3DNG.

[0034] Step 2, weigh 10mg Co(CH 3 COO) 2 4H 2 O, successively measure 7mL of deionized water and 7mL of absolute ethanol, and stir thoroughly for 10min. The 3DNG was then immersed in the Co salt solution and allowed to stand for 24 h. Then, the impregnated 3DNG was washed several times in a mixed solution of ethanol and water (1:1), and the product was placed in a refrig...

Embodiment 2

[0039] This embodiment specifically includes the following steps:

[0040] In the first step, add 20mL, 3mg / mL GO dispersion into a 40mL hydrothermal kettle, and then measure 1.0mL NH 3 ·H 2 O was added to the GO dispersion and stirred thoroughly for 5 min. Then, the reaction kettle was transferred to an oven, heated to 180°C, and kept at this temperature for 12h. After the reaction was completed and the reactor was naturally cooled, the product was transferred to deionized water for dialysis until the pH of the deionized water was 7, and the obtained product was named 3DNG.

[0041] The second step, weigh 20mg Co(CH 3 COO) 2 4H 2 O, successively measure 7mL of deionized water and 7mL of absolute ethanol, and stir thoroughly for 10min. The 3DNG was then immersed in the Co salt solution and allowed to stand for 24 h. Then, the impregnated 3DNG was washed several times in a mixed solution of ethanol and water (1:1), and the product was placed in a refrigerator (-25°C) for...

Embodiment 3

[0046] This embodiment specifically includes the following steps:

[0047] Step 1. Add 20mL, 4mg / mL GO dispersion into a 40mL hydrothermal kettle, and then measure 1.5mL NH 3 ·H 2 O was added to the GO dispersion and stirred thoroughly for 5 min. Then, the reaction kettle was transferred to an oven, heated to 180°C, and kept at this temperature for 12h. After the reaction was completed and the reactor was naturally cooled, the product was transferred to deionized water for dialysis until the pH of the deionized water was 7, and the obtained product was named 3DNG.

[0048] Step 2. Weigh 30mg Co(CH3COO) 2 4H 2 O, successively measure 7mL of deionized water and 7mL of absolute ethanol, and stir thoroughly for 10min. The 3DNG was then immersed in the Co salt solution and allowed to stand for 24 h. Then, the impregnated 3DNG was washed several times in a mixed solution of ethanol and water (1:1), and the product was placed in a refrigerator (-25°C) for 12 hours, and finally ...

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Abstract

A method for preparing a Co / 3DNG catalyst and applying the Co / 3DNG catalyst to catalytic oxidation of lignin and a beta-O-4 model compound thereof comprises the following steps: mixing a graphene oxide (GO) dispersion liquid with ammonia water, carrying out hydrothermal treatment to obtain three-dimensional nitrogen-doped graphene (3DNG), dipping the 3DNG in a Co salt solution, freeze-drying the dipping product, and carrying out high-temperature cracking to prepare the Co / 3DNG. The method is used for catalyzing oxidative depolymerization of lignin and the beta-O-4 model compound thereof, and shows excellent catalytic activity and selectivity under the condition that no inorganic base is added.

Description

technical field [0001] The invention relates to the technology in the field of catalyst preparation and biomass conversion, in particular to a three-dimensional nitrogen-doped graphene-supported cobalt nanoparticle (Co / 3DNG) catalyst prepared by hydrothermal-impregnation-pyrolysis method and its preparation in lignin And its application in oxidative transformation of β-O-4 model compound. Background technique [0002] Lignin is a biomass resource that is second only to cellulose in nature and contains a natural aromatic ring structure. It can obtain multifunctional monomer compounds through oxidative depolymerization, providing functionalized monomers and low-temperature compounds for the organic chemical and pharmaceutical industries. Polymer raw materials. For many years, people have been working on breaking the β-O-4 linking structure by choosing a suitable catalyst, so as to realize the high additional utilization of lignin. In the existing lignin and its β-O-4 model c...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J37/02B01J37/08B01J37/10B01J37/32C07C37/52C07C39/04
CPCB01J27/24B01J37/10B01J37/0201B01J37/32B01J37/082C07C37/52B01J35/399B01J35/23C07C39/04Y02P20/52
Inventor 张佳利郭守武
Owner SHANGHAI JIAO TONG UNIV
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