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A method for preparing nitrogen-doped carbon and nitrogen-containing heterocycle by using plasma

A technology of plasma and nitrogen heterocycle, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of low selectivity of nitrogen-containing products, lower biomass utilization rate, and affect high-value utilization, etc., to achieve Achieve high-value utilization, improve utilization, reduce energy consumption and thermal corrosion effects

Active Publication Date: 2021-10-15
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The key to the reaction of biomass and ammonia to produce nitrogen-containing products is to promote the reaction of biomass pyrolysis intermediates with ammonia and its nitrogen-containing free radicals. However, due to the good stability of ammonia itself, it is difficult to directly decompose to form a large amount of Nitrogen radicals, so usually the reaction rate is low, resulting in a low yield of nitrogen-containing products, that is, the selectivity of nitrogen-containing products in liquid oil is low, and the nitrogen content in nitrogen-doped carbon is not high, which seriously affects its subsequent high value utilization, thereby reducing the utilization rate of biomass

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  • A method for preparing nitrogen-doped carbon and nitrogen-containing heterocycle by using plasma

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Embodiment 1

[0042] The embodiment of the present invention describes a method for preparing nitrogen-doped carbon and nitrogen-containing heterocycles by using plasma, and the method specifically includes the following steps:

[0043] S1: Combine the crushed and dried bamboo with a small amount of green activator CH 3 COOK for full mechanical mixing, drying temperature is 105°C, drying time is 24h, CH 3 COOK quality accounts for 5% of bamboo quality, obtains reaction raw material,

[0044] S2: Put the mixture (2g) of step S1 into the first stage of dielectric barrier discharge plasma reactor, the reaction temperature is 400°C, the plasma power is 50W, and a certain proportion of ammonia gas is introduced, and the total gas flow rate is 500mL / min, the proportion of ammonia to the total gas (ammonia and argon) is 5%, the plasma promotes the decomposition of ammonia and biomass, strengthens the synergy between ammonia and green activators, promotes the full activation of biomass and nitrog...

Embodiment 2

[0050] S1: Combine the crushed and dried bamboo with a small amount of green activator CH 3 COOK for full mechanical mixing, drying temperature is 105°C, drying time is 24h, CH 3 COOK quality accounts for 8% of bamboo quality, obtains reaction raw material,

[0051] S2: Put the mixture (2g) of step S1 into the first stage of the dielectric barrier discharge plasma reactor, the reaction temperature is 500°C, the plasma power is 100W, and a certain proportion of ammonia gas is introduced, and the total gas flow rate is 500mL / min, the proportion of ammonia to the total gas (ammonia and argon) is 8%, the plasma promotes the decomposition of ammonia and biomass, strengthens the synergy between ammonia and green activators, promotes the full activation of biomass and nitrogen doping, and the reaction time for 30min,

[0052] S3: Pass the pyrolysis volatiles obtained in step S2 into the second stage of the dielectric barrier discharge plasma reactor. Under the action of ZSM-5 cata...

Embodiment 3

[0057] S1: Combine the crushed and dried bamboo with a small amount of green activator CH 3 COOK for full mechanical mixing, drying temperature is 105°C, drying time is 24h, CH 3 COOK quality accounts for 10% of bamboo quality, obtains reaction raw material,

[0058] S2: Put the mixture (2g) of step S1 into the first stage of dielectric barrier discharge plasma reactor, the reaction temperature is 600°C, the plasma power is 200W, and a certain proportion of ammonia gas is introduced, and the total gas flow rate is 500mL / min, the proportion of ammonia to the total gas (ammonia and argon) is 10%, the plasma promotes the decomposition of ammonia and biomass, strengthens the synergy between ammonia and green activators, promotes the full activation of biomass and nitrogen doping, and the reaction time for 60min,

[0059] S3: Pass the pyrolysis volatiles obtained in step S2 into the second stage of the dielectric barrier discharge plasma reactor. Under the action of ZSM-5 cataly...

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Abstract

The invention belongs to the field of biomass utilization, and discloses a method for preparing nitrogen-doped carbon and nitrogen-containing heterocyclic rings by using plasma, comprising the following steps: S1: mixing biomass with an activator; S2: mixing ammonia gas, plasma Reaction under the conditions to obtain pyrolysis volatiles; S3: under the action of catalyst, carry out cyclization and upgrading reaction in pyrolysis volatiles to obtain solid products and nitrogen-containing heterocyclic volatiles; S4: cool nitrogen-containing heterocyclic volatiles to obtain Liquid oil enriched with nitrogen-containing heterocyclic products; the solid product is acid-washed, washed with water and dried to obtain a porous nitrogen-doped carbon material. The invention introduces plasma in the reaction process, utilizes the plasma to promote the decomposition of ammonia gas into nitrogen-containing free radicals, strengthens the reaction between free radicals and biomass pyrolysis intermediates, and the synergistic effect of free radicals and activators, thereby promoting The formation of nitrogen-containing products realizes the purpose of using biomass to prepare highly selective nitrogen-containing heterocycles and high-performance nitrogen-doped carbons.

Description

technical field [0001] The invention belongs to the field of biomass utilization, and more specifically relates to a method for preparing nitrogen-doped carbon and nitrogen-containing heterocyclic rings by using plasma. Background technique [0002] Biomass is the only carbon-containing renewable resource on the earth, and its conversion into high-value chemicals and carbon materials is an inevitable trend of sustainable development in the future. Biomass can be directly converted into liquid oil and biochar through pyrolysis, but due to the complex composition of biomass raw materials, the composition of liquid oil is complex, the quality is low, and the physical and chemical properties of biochar need to be improved, so directly Pyrolysis is difficult to achieve high-value utilization of biomass. [0003] Biomass has the characteristics of high oxygen content and high activity. If ammonia gas is introduced during its pyrolysis process, ammonia gas can react with oxygen-co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/348C01B32/324
CPCC01B32/324C01B32/348
Inventor 陈伟杨海平陈应泉王贤华邵敬爱杨晴张雄陈旭张世红陈汉平
Owner HUAZHONG UNIV OF SCI & TECH
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