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Preparation method and application of femos catalyst for microwave-assisted catalytic depolymerization of lignin

A microwave-assisted, catalytic depolymerization technology, which is applied in the direction of physical/chemical process catalysts, lignin derivatives, chemical instruments and methods, etc., can solve the problems of affecting the catalytic conversion efficiency of catalysts, and the efficiency of microwave absorption and heat transfer is not good enough to achieve absorption Wave-enhanced heat transfer catalysis for efficient depolymerization, improved catalytic reforming effect, and improved depolymerization efficiency

Active Publication Date: 2021-03-30
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the microwave absorption and heat transfer efficiency of conventional metal catalysts is far lower than that of polar dielectric materials, and microwave conditions will inhibit the active components of the catalyst and affect the catalytic conversion efficiency of the catalyst.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0031] A method for preparing a FeMoS catalyst for microwave-assisted catalytic depolymerization of lignin, comprising the following steps:

[0032] (1) The melamine resin foam is prepared into a cylindrical structure with an aspect ratio of 10:3, and then cleaned with deionized water and ethanol, respectively, and placed in a microwave-assisted depolymerization reactor. 2 Atmosphere, N 2 The flow rate is 10-100mL / min, and the microwave power is 50-200W raised to 200-300°C for oxidation treatment, and kept for 1-3 hours to obtain pretreated melamine resin foam.

[0033] (2) Carbonizing the pretreated melamine resin foam obtained in step (1) to obtain a melamine resin carbon-based material. Carbonization conditions: microwave power 200~400W, carbonization temperature 600~800℃, carbonization time 0.5~6h, carbonization process in N 2 under atmosphere, N 2 The flow rate is 10-100mL / min. After carbonization, the temperature was naturally cooled to room temperature and then take...

Embodiment 1

[0042] The melamine resin foam was prepared into a cylindrical structure with a diameter of 4.5 cm and a length of 15 cm, and then cleaned with deionized water and ethanol, respectively, and placed in a microwave-assisted depolymerization reactor. 2 Under the atmosphere (10mL / min), the temperature was raised to 200° C. with a microwave power of 50W, and the temperature was kept for 3 hours to obtain a pretreated melamine resin foam. The obtained pretreated melamine resin foam was subjected to a microwave power of 200W, a carbonization temperature of 600°C, a carbonization time of 6h, and N 2 The carbonization treatment was carried out at a flow rate of 10mL / min. After the carbonization was completed, the temperature was naturally cooled to room temperature and then taken out to obtain a melamine resin carbon-based material. Then the obtained melamine resin carbon-based material containing 0.48mM Fe(NO 3 ) 3 , 0.07mM (NH 4 ) 6 Mo 7 o 24 , 1.91mM CH 4 N 2 O and 1.91 mM N...

Embodiment 2

[0044] The melamine resin foam was prepared into a cylindrical structure with a diameter of 3 cm and a length of 10 cm, and then cleaned with deionized water and ethanol, respectively, and placed in a microwave-assisted depolymerization reactor. 2 Under atmosphere (55mL / min), microwave power 75W was used to raise the temperature to 250° C. and keep it warm for 2 hours to obtain pretreated melamine resin foam. The obtained pretreated melamine resin foam was subjected to a microwave power of 300W, a carbonization temperature of 700°C, a carbonization time of 4h, and N 2 The flow rate is 55mL / min for carbonization treatment. After the carbonization is completed, the temperature is naturally cooled to room temperature and then taken out to obtain a melamine resin carbon-based material. Then the obtained melamine resin carbon-based material containing 0.48mM Fe(NO 3 ) 3 , 0.48mM (NH 4 ) 6 Mo 7 o 24 , 1.91mM CH 4 N 2 O and 1.91 mM NH 4 Hydrothermal treatment was carried out...

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Abstract

The invention discloses a preparation method of a FeMoS catalyst for microwave-assisted catalytic depolymerization of lignin. The melamine resin foam is cleaned with deionized water and ethanol respectively, and put into a microwave-assisted depolymerization reactor for oxidation treatment to obtain pretreated Melamine resin foam; carbonize the pretreated melamine resin foam, and naturally cool down to room temperature after carbonization to obtain the melamine resin carbon-based material; hydrothermally treat the melamine resin carbon-based material to obtain nitrogen-doped Fe x Mo y Catalyst precursor, the aqueous solution of described hydrothermal treatment contains Fe(NO 3 ) 3 , (NH 4 ) 6 Mo 7 o 24 、CH 4 N 2 O and NH 4 F; doping Fe with nitrogen x Mo y Catalyst precursors were immersed in Na 2 Hydrothermal treatment is carried out in S aqueous solution, and the product is washed with water and dried to obtain the FeMoS catalyst. Applying the prepared catalyst to the microwave-assisted catalytic depolymerization process of lignin can obtain target products with high yield and high selectivity, and realize the reduction and high-value utilization of lignin resources.

Description

technical field [0001] The invention belongs to the field of catalytic conversion of biomass resources, and in particular relates to a preparation method and application of a FeMoS catalyst for microwave-assisted catalytic depolymerization of lignin. Background technique [0002] Lignin is a natural organic polymer synthesized by secondary metabolism in plants. In nature, it regenerates at a rate of 50 billion tons per year, and its reserves are second only to cellulose. It is the second most abundant natural polymer in nature. At the same time, lignin is also an environmentally friendly, renewable and biodegradable natural resource. Industrially, lignin is the main by-product in the process of pulping and papermaking and agricultural and forestry biomass refining. The alkali lignin produced and the kraft lignin produced by kraft pulping account for a large proportion. Alkali lignin and kraft lignin exist in the black liquor produced in the pulping and papermaking process....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07G1/00C07G99/00B01J27/051
CPCC07G1/00B01J27/0515C07G99/00
Inventor 王文亮王敏赵兴金马振浩
Owner SHAANXI UNIV OF SCI & TECH