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Nickel-cerium biochar catalyst as well as preparation method and application thereof

A biochar and catalyst technology, which is applied in the field of lignin degradation, can solve the problems of increasing the oxygen content of depolymerization products, cannot replace fossil fuels, and is not conducive to the use of commercial fuels. The effect of sustainable development of social benefits

Pending Publication Date: 2022-04-05
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the chemical conversion methods of catalytic depolymerization of lignin mainly include: catalytic pyrolysis, catalytic hydrogenolysis, catalytic oxidation and other methods. Complex and difficult to purify, the product has high oxygen content and high freezing point, and cannot replace fossil fuels
Catalytic hydrogenolysis mostly uses noble metals and molecular hydrogen, which is costly and requires demanding equipment
The catalytic oxidation process can significantly reduce the activation energy and achieve efficient depolymerization, but the use of oxidants may not only lead to excessive oxidation of the product, but also increase the oxygen content of the depolymerization product, which is not conducive to the use of commercial fuel

Method used

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Examples

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preparation example Construction

[0030] A kind of preparation method of nickel cerium biochar catalyst, described preparation method comprises the following steps:

[0031] S1. Dissolving and calcining the lignin with a low-temperature solvent to obtain a biochar carrier;

[0032] S2, dissolving the precursor salt of nickel and cerium in deionized water to form solution I, then adding calcined biochar, adding it to solution I, heating and stirring to form suspension II;

[0033] S3. Carrying out sealing and aging treatment, vacuum drying treatment and calcination treatment on the suspension II in sequence to prepare a nickel-cerium biochar catalyst.

[0034] Among them, the dissolution of lignin is carried out at 100-200°C under nitrogen atmosphere; the calcination of lignin is carried out at 200-400°C under carbon dioxide atmosphere;

[0035] The solvent used for dissolving the lignin is an organic solvent, including one of ethanol, ethylene glycol or dimethyl sulfoxide.

[0036] The precursor salt of nick...

Embodiment 1

[0043] Preparation of Ni-Cerium Biochar Catalyst and Depolymerization of Lignin with Crude Glycerol System Synergistically with Nickel-Cerium Biochar Catalyst:

[0044] 1. The preparation of nickel-cerium biochar catalyst comprises the following steps:

[0045] Dissolve biochar raw material lignin in 50ml of ethylene glycol, and react in a nitrogen atmosphere at 180°C in a reactor at a constant temperature for 2 hours to obtain a dark brown molten lignin solution, which is spin-dried at 105°C in air to obtain solid I; ⅠPut it in a tube furnace, heat it up to 200°C at a heating rate of 2°C / min, then roast it in a CO2 atmosphere for 1 hour, and grind it into powder to obtain a biochar carrier; weigh 1.8842g Ni(NO 3 ) 2 ·6H 2 O and 1.2386gCe(NO 3 )3·6H 2Put O in a 250mL round-bottom beaker and add 100mL deionized water to completely dissolve to form solution I; weigh 3.60g of calcined biochar, add it to solution I, place it in a water bath and stir at 60°C for 24 hours to for...

Embodiment 2

[0050] Preparation of Ni-Cerium Biochar Catalyst and Depolymerization of Lignin with Crude Glycerol System Synergistically with Ni-Cerium Biochar Catalyst.

[0051] 1. The preparation of nickel-cerium biochar catalyst comprises the following steps:

[0052] Dissolve biochar raw material lignin in 50ml of ethylene glycol, and react in a nitrogen atmosphere at a constant temperature of 150°C in a reactor for 3 hours to obtain a dark brown molten lignin solution, which is spin-dried at 105°C in air to obtain solid I; Ⅰ Put it in a tube furnace, heat it up to 250°C at a rate of 3°C / min, then roast it in a CO2 atmosphere for 2 hours, and grind it into powder to obtain a biochar carrier; weigh 1.8842g Ni(NO 3 ) 2 ·6H 2 O and 0.1239gCe(NO 3 ) 3 ·6H 2 Put O in a 250mL round-bottom beaker and add 100mL deionized water to completely dissolve to form solution I; weigh 3.60g of calcined biochar, add it to solution I, place it in a water bath and stir at 60°C for 24 hours to form a su...

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Abstract

The invention relates to the field of lignin degradation, in particular to a nickel-cerium biochar catalyst and a preparation method and application thereof.The nickel-cerium biochar catalyst comprises biochar serving as a carrier and active components loaded on the biochar, and the active components comprise nickel and cerium; the content of nickel is 1-10 wt.%, the content of cerium is 1-10 wt.%, and the balance is charcoal. According to the application, the nickel-cerium biochar catalyst is applied to catalytic depolymerization of lignin. According to the nickel-cerium biochar catalyst, the raw material for preparing the biochar is lignin, the lignin widely exists in the nature, is low in obtaining cost, can be regenerated, can effectively reduce the depolymerization cost and is suitable for large-scale industrial application, and the nickel-cerium biochar catalyst is matched with a crude glycerine system, so that the nickel-cerium biochar catalyst is of great benefit to green utilization of an industrial byproduct crude glycerine, and is suitable for large-scale industrial application. The lignin depolymerization efficiency is high, the conversion rate of the lignin can reach 78% or above, the selectivity of guaiacol and derivatives thereof exceeds 82%, and the selectivity of the monomer guaiacol exceeds 41%.

Description

technical field [0001] The invention relates to the field of lignin degradation, in particular to a nickel-cerium biochar catalyst and its preparation method and application. Background technique [0002] Lignocellulosic biomass is mainly composed of cellulose, hemicellulose, and lignin, of which lignin accounts for 15-20%. It is the only non-fossil energy source that provides aryl compounds in nature. Renewable and inexpensive, can be continuously converted into chemicals, fuels and carbon materials. Lignin is seldom utilized on a large scale due to its irregular aggregate structure and recalcitrance, and is considered as a waste in the process of pulp and paper industry and biorefining. In most cases, it is directly burned as low-value energy, which not only causes waste of resources but also pollutes the air. Starting from improving resource utilization, catalytic depolymerization of lignin to prepare high value-added aromatic compounds can not only reduce the dependenc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83C07C41/26C07C43/23
CPCB01J37/0236B01J37/0201B01J37/088B01J21/18B01J23/002B01J23/83C08H6/00
Inventor 王一双李洪陈明强王君李唱袁刚
Owner ANHUI UNIV OF SCI & TECH
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