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Green method for preparing high-carbon-content porous biochar material

A biochar and green technology, applied in carbon compounds, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as difficult large-scale application, difficult to remove hydrochloric acid, strong corrosion, etc., to achieve easy large-scale application, low ammonia concentration Low, porosity-enhancing effect

Pending Publication Date: 2020-04-14
武汉热解无限能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the ash content in biochar is mainly reduced by hydrochloric acid or HF pickling, but hydrochloric acid is difficult to remove SiO from biochar. 2 , while HF acid can remove SiO 2 , but its corrosiveness is too strong to be applied on a large scale
However, how to increase the carbon content in biochar and prepare biochar materials with high carbon content has not been reported yet.

Method used

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Examples

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Effect test

Embodiment 1

[0041] The embodiment of the present invention describes a method of using biomass to prepare nitrogen-doped carbon catalyst, and the method specifically includes the following steps:

[0042] S1: After pulverizing the bamboo waste to <120 mesh, fully mix it with KOH activator by dipping, the ratio of the three is 1:50, after dipping for 24 hours, evaporate the water in it under an argon atmosphere at 60°C, and get mixed samples;

[0043] S2: Put the mixed sample in step S1 into a fixed bed reactor for activation reaction under argon atmosphere, the heating rate is 100°C / min, the high carrier gas flow rate is 1L / min, the reaction temperature is 900°C, and the reaction time is For 2 hours, the biomass fully reacts with the alkaline activator to obtain activated carbon with high porosity and high content;

[0044] S3: Put the activated carbon obtained in step S2 into the ammonia solution, the concentration of ammonia water is 15%, shake and soak for 1 day, the ammonia water is ...

Embodiment 2

[0048] S1: After pulverizing the bamboo waste to <120 mesh, fully mix it with KOH activator by dipping, the ratio of the three is 1:50, after dipping for 24 hours, evaporate the water in it under an argon atmosphere at 60°C, and get mixed samples;

[0049] S2: Put the mixed sample in step S1 into a fixed bed reactor for activation reaction under argon atmosphere, the heating rate is 100°C / min, the high carrier gas flow rate is 1L / min, the reaction temperature is 900°C, and the reaction time is For 2 hours, the biomass fully reacts with the alkaline activator to obtain activated carbon with high porosity and high content;

[0050] S3: Put the activated carbon obtained in step S2 into the ammonia solution, the concentration of ammonia water is 10%, shake and soak for 1 day, the ammonia water fully reacts with the unreacted SiO in the activated carbon 2 reaction to obtain activated carbon after ammonia treatment;

[0051] S4: Immerse the activated charcoal obtained in step S3 i...

Embodiment 3

[0054] S1: After pulverizing the bamboo waste to <120 mesh, fully mix it with KOH activator by dipping, the ratio of the three is 1:50, after dipping for 24 hours, evaporate the water in it under an argon atmosphere at 60°C, and get mixed samples;

[0055] S2: Put the mixed sample in step S1 into a fixed bed reactor for activation reaction under argon atmosphere, the heating rate is 100°C / min, the high carrier gas flow rate is 1L / min, the reaction temperature is 900°C, and the reaction time is For 2 hours, the biomass fully reacts with the alkaline activator to obtain activated carbon with high porosity and high content;

[0056] S3: Put the activated carbon obtained in step S2 into the ammonia solution, the concentration of ammonia water is 5%, shake and soak for 1 day, the ammonia water is fully mixed with the unreacted SiO in the activated carbon 2 reaction to obtain activated carbon after ammonia treatment;

[0057] S4: Immerse the activated charcoal obtained in step S3 ...

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Abstract

The invention discloses a green method for preparing a high-carbon-content porous biochar material. The method comprises the following steps:by mixing and activating biomass waste and a low-proportionalkaline activating agent, under the conditions of high heating rate, high carrier gas flow, high activation temperature and long reaction time, the activating agent is fully reacted with the biomassto form activated carbon with a developed pore structure and high carbon content, part of the activating agent is reacted with SiO2 in the biomass to convert the activated carbon into silicate easy to remove, an oxygen-containing volatile matter is rapidly carried out through high carrier gas flow, and the carbon content and porosity of the activated carbon are further improved; further by treating the activated carbon by utilizing low-concentration ammonia water, SiO2 which is not completely reacted into silicateis converted by the ammonia water; then the activated carbon is deeply treated by utilizing low-concentration pyroligneous liquor, and silicate, other alkalis and alkaline-earth metals are removed together, so that the ash content in the biochar is effectively reduced, the carboncontent of the biochar is improved, the green preparation of the high-carbon-content porous biochar material is realized, and the high-valued utilization of the biomass is facilitated.

Description

technical field [0001] The invention relates to the field of biomass utilization, in particular to a green method for preparing porous biochar materials with high carbon content. Background technique [0002] Biomass is the only carbon-containing renewable resource on the earth. Because of its unique composition and high reactivity, it is an inevitable trend for future development to convert it into high value-added chemicals and functional carbon materials. At present, biomass-based biochar materials have been widely used in soil improvement, adsorption of gaseous pollutants, removal of organic pollutants, adsorption of heavy metals, hydrogen storage, thermocatalysis and electrocatalysis, supercapacitors and battery electrode materials and other fields. However, because the biomass itself contains a relatively high oxygen content and a certain ash content, in the process of preparing biochar from biomass, the biochar still contains a relatively high oxygen content and ash c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/342C01B32/348C01B32/336C01B32/324
CPCC01B32/342C01B32/348C01B32/336C01B32/324
Inventor 陈伟
Owner 武汉热解无限能源科技有限公司
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