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Method for preparing phenol-rich bio-oil through microwave-assisted catalytic pyrolysis of lignin

A microwave-assisted, catalytic pyrolysis technology, applied in chemical instruments and methods, biofuels, chemical/physical processes, etc., can solve the problems of waste of lignin raw materials, coking inactivation, difficulty in controlling the ratio of feeding materials, etc., and achieve economical practicability High, improved reactivity, low production cost

Inactive Publication Date: 2020-07-03
CHANGZHOU INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When using zeolite-based catalysts such as HZSM-5 and ZSM-5 to prepare phenol-rich bio-oil, there are problems such as insufficient selectivity and severe coking and deactivation; composite catalysts prepared by doping other metal oxide catalysts in zeolite-based catalysts, On the one hand, it is difficult to control the ratio of zeolite-based catalysts to metal oxide catalysts in the composite catalyst, and on the other hand, it is difficult to control the ratio of each component catalyst to raw materials in the composite catalyst, which is not conducive to the highly selective preparation of phenolic products
Transition metal sulfides (such as MoS 2 ) alone as a catalyst, the catalytic hydrogenation activity of the catalyst is relatively low, resulting in a low yield of phenol-rich bio-oil and a waste of lignin raw materials

Method used

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Examples

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Effect test

Embodiment 1

[0026] A method for preparing phenol-rich bio-oil by microwave-assisted catalytic pyrolysis of lignin according to the present invention prepares phenol-rich bio-oil by microwave-assisted pyrolysis, comprising the following steps:

[0027] S1: Dissolve 0.0957g of ammonium heptamolybdate tetrahydrate and 0.0394g of nickel nitrate hexahydrate in deionized water, impregnate and load on activated carbon in equal volume for 48h; place the impregnated sample in an oven at 125°C and dry for 11h , after drying, put it into the atmosphere protection furnace, pass nitrogen gas, heat up to 450°C at a heating rate of 5°C / min, and keep the constant temperature for 3h, cool to room temperature, H 2 S / H 2 The total flow rate of mixed gas is 65mL / min, H 2 The S volume fraction is 8%, and the double metal ion Ni-MoS supported on activated carbon is obtained 2 / AC catalyst 1.2g, wherein the total mass of active components Mo and Ni accounts for 2 / 5% of the total mass of the AC catalyst, the...

Embodiment 2

[0031] A method for preparing phenol-rich bio-oil by microwave-assisted catalytic pyrolysis of lignin according to the present invention prepares phenol-rich bio-oil by microwave-assisted pyrolysis, comprising the following steps:

[0032]S1: Dissolve 0.1961g ammonium heptamolybdate tetrahydrate and 0.2152g nickel nitrate hexahydrate in deionized water, impregnate equal volumes on activated carbon for 36 hours; dry the impregnated sample in an oven at 125°C for 11 hours , after drying, put it into the atmosphere protection furnace, pass nitrogen gas, heat up to 450°C at a heating rate of 5°C / min, and keep the constant temperature for 3h, cool to room temperature, H 2 S / H 2 The total flow rate of mixed gas is 65mL / min, H 2 The S volume fraction is 8%, and the double metal ion Ni-MoS supported on activated carbon is obtained 2 / AC catalyst 1.5g, wherein the total mass of active components Mo and Ni accounts for 2 / 10% of the total mass of the AC catalyst, the molar ratio of t...

Embodiment 3

[0036] A method for preparing phenol-rich bio-oil by microwave-assisted catalytic pyrolysis of lignin according to the present invention prepares phenol-rich bio-oil by microwave-assisted pyrolysis, comprising the following steps:

[0037] S1: Dissolve 0.2591g of ammonium heptamolybdate tetrahydrate and 0.6399g of nickel nitrate hexahydrate in deionized water, impregnate and load on activated carbon in equal volume for 60h; place the impregnated sample in an oven at 125°C and dry for 11h , after drying, put it into the atmosphere protection furnace, pass nitrogen gas, heat up to 450°C at a heating rate of 5°C / min, and keep the constant temperature for 3h, cool to room temperature, H 2 S / H 2 The total flow rate of mixed gas is 65mL / min, H 2 The S volume fraction is 8%, and the double metal ion Ni-MoS supported on activated carbon is obtained 2 / AC catalyst 1.8g, wherein the total mass of active components Mo and Ni accounted for 2 15% of the total mass of the AC catalyst, th...

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Abstract

The invention discloses a method for preparing phenol-rich bio-oil through microwave-assisted catalytic pyrolysis of lignin, and belongs to the field of biomass energy utilization. The preparation method comprises the following steps: mixing lignin with an activated carbon supported bimetallic ion Ni-MoS2 / AC catalyst, carrying out microwave-assisted catalytic pyrolysis to obtain lysate, and sequentially carrying out extraction and evaporation on the lysate to remove the extractant, thereby obtaining the phenol-rich bio-oil. The method has the characteristics of high pyrolysis speed, energy efficiency, high efficiency, greenness and environment friendliness. The activated carbon loaded bimetallic ion Ni-MoS2 / AC catalyst has the catalytic characteristics of proper hydrodeoxygenation activityand high selectivity, high-content phenol-rich bio-oil can be conveniently obtained, and the catalyst is high in stability, low in production cost and high in economic practicability.

Description

technical field [0001] The invention belongs to the technical field of biomass energy utilization, and in particular relates to a method for preparing phenol-rich bio-oil by microwave-assisted catalytic pyrolysis of lignin. Background technique [0002] Lignin is one of the three major components of biomass and the second largest renewable resource after cellulose. Lignin is a complex three-dimensional amorphous polymer with a variety of active functional groups in its side chains, among which the proportion of phenolic hydroxyl (-OH) is very high, which is an ideal raw material for the production of phenolic compounds. As an important chemical raw material, phenolic compounds are widely used in the preparation of phenolic resins, preservatives, flavoring agents, etc. [0003] Microwave pyrolysis is a promising method for the sustainable production of bio-oils and value-added chemicals, which has been extensively studied in the laboratory due to its advantages of fast heati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/02C10G1/00B01J27/051
CPCB01J27/0515C10B53/02C10G1/002Y02E50/10
Inventor 蒋晓燕王文露崔爱晗
Owner CHANGZHOU INST OF TECH
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