Method for preparing nitrogen-doped carbon and nitrogen-containing heterocyclic ring by using plasma

A plasma and nitrogen heterocycle technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of reduced biomass utilization, low selectivity of nitrogen-containing products, and low yield of nitrogen-containing products, etc. Achieve the effect of improving utilization, realizing high-value utilization, and increasing reactivity

Active Publication Date: 2020-07-03
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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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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  • Method for preparing nitrogen-doped carbon and nitrogen-containing heterocyclic ring 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 a nitrogen-containing heterocyclic ring by using plasma. The method comprisesthe following steps: S1, mixing biomass with an activator; S2, reacting under the conditions of ammonia gas and plasma to obtain pyrolysis volatile matter; S3, carrying out a cyclization upgrading reaction on the pyrolysis volatile matter under the action of a catalyst to obtain a solid product and a nitrogen-containing heterocyclic ring volatile matter; and S4, cooling the nitrogen-containing heterocyclic ring volatile matter to obtain liquid oil enriched with the nitrogen-containing heterocyclic ring product, and carrying out acid washing, water washing and drying treatment on the solid product to obtain the porous nitrogen-doped carbon material. Plasma is introduced in the reaction process, the ammonia gas is promoted to be decomposed into nitrogen-containing free radical groups by utilizing plasmas, the reaction of the free radical groups and a biomass pyrolysis intermediate is enhanced, and the synergistic effect of the free radical groups and the activator is enhanced, so that the formation of the nitrogen-containing product is promoted, and the purpose of preparing the high-selectivity nitrogen-containing heterocyclic ring and the high-performance nitrogen-doped carbon by utilizing biomass is achieved.

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 Applications(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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