炭活化一步法制备豆渣基极微孔活性炭

鉴于以含氮生物质为原料,采用炭化碱活化两步法制备掺氮活性炭的工艺较长,该研究以大豆渣为原料,K2CO3为活化剂,尝试采用炭活化一步法制备含极微孔的掺氮活性炭,并考察活化温度对活性炭化学组成、孔结构及低压CO2吸附性能的影响。研究表明,该方法可用于制备富含极微孔的掺氮活性炭。当活化温度从560℃升高到650℃时,1）活性炭的氮元素皆均匀分布在体相及表面,其质量分数（4.1%~4.4%）变化不大,而其化学状态发生变化;2）比表面积、总孔容、微孔孔容均呈单调递增,但极微孔孔容先增大后减小。活化温度为600℃的样品,极微孔孔容较大（0.13 m L/g）,极微孔主要集中在0.42~0.70 nm,微孔...

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Published in农业工程学报 Vol. 31; no. 19; pp. 309 - 314
Main Author 李大伟 田原宇 郝俊辉 田斌 李俊花 车远军
Format Journal Article
LanguageChinese
Published 中国石油大学 华东 重质油国家重点实验室,青岛,266580 2015
Subjects
二氧化碳捕集
吸附
工艺
废弃物
极微孔
氮掺杂
活性炭
adsorption
二氧化碳捕集
wastes
ultramicropore
吸附
活性炭
废弃物
technology
氮掺杂
N-doping
极微孔
activated carbon
CO2 capture
工艺
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Summary:鉴于以含氮生物质为原料,采用炭化碱活化两步法制备掺氮活性炭的工艺较长,该研究以大豆渣为原料,K2CO3为活化剂,尝试采用炭活化一步法制备含极微孔的掺氮活性炭,并考察活化温度对活性炭化学组成、孔结构及低压CO2吸附性能的影响。研究表明,该方法可用于制备富含极微孔的掺氮活性炭。当活化温度从560℃升高到650℃时,1）活性炭的氮元素皆均匀分布在体相及表面,其质量分数（4.1%~4.4%）变化不大,而其化学状态发生变化;2）比表面积、总孔容、微孔孔容均呈单调递增,但极微孔孔容先增大后减小。活化温度为600℃的样品,极微孔孔容较大（0.13 m L/g）,极微孔主要集中在0.42~0.70 nm,微孔孔容、总孔容、比表面积分别为0.40 m L/g、0.43 m L/g、948 m2/g。该样品在10 k Pa、0℃下的CO2吸附量达1.94 mmol/g,CO2/N2表观选择性为41.6,说明它对低压CO2能同时展现出较高的吸附量及表观选择性。该研究为含氮活性炭的便捷制备提供了参考。
Bibliography:11-2047/S
activated carbon; wastes; technology; adsorption; N-doping; CO2 capture; ultramicropore
So far, some studies have been conducted on preparation of nitrogen-doped（N-doped） active carbon from N-containing biomasses using alkalis as activators. In these studies, the commonly used preparation method was activation with alkali after biomass carbonization. Compared with this method, the one-step carbonization/activation method was simple and apt to reduce energy consumption, but its application in the preparation of N-doped active carbon was not investigated. In this research, N-doped active carbon with ultramicropores was prepared from waste soybean dreg using K2CO3 as activator via one-step carbonization/activation technology. The effects of activation temperature on chemical composition, pore structure, and low-pressure CO2 adsorption performances of the active carbon were investigated. To prepare active carbon, waste soybean dreg with particle size of 0.15-0.90 mm was impregnated with K2CO3 aqueous solu
ISSN:1002-6819
DOI:10.11975/j.issn.1002-6819.2015.19.042