Abstract

Preparation of activated carbons from wood waste including northern hardwood pins-fines and wood dust was conducted and then compared through the following methods: physical pyrolysis and CO₂ activation, vacuum pyrolysis and CO₂ activation, CO₂ gasification, and vacuum CO₂ gasification processes. Experimental results show that chars and activated carbons with high surface area and pore volume are produced from wood waste through a vacuum CO₂ pyrolysis/gasification process. The effects of operation variables of vacuum pyrolysis/gasification on the properties of chars and activated carbons were investigated to identify and optimize the temperature, heating time, and heating rate. The optimized vacuum CO₂ gasification conditions were found to be a temperature of 800 °C, a heating rate of 20 °C/min, and a holding time of 2 h respectively. The prepared wood-chars and activated carbons were characterized by nitrogen physisorption, scanning electron microscopy (SEM). Fourier transform infrared (FTIR) spectra determined any changes in the surface functional groups produced during different preparation stages.

Graphic abstract

中文翻译：

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木材废料中焦炭和活性炭的制备与表征

摘要

进行了从包括北方硬木针状细粉和木屑在内的木材废料中制备活性炭，然后通过以下方法进行比较：物理热解和CO ₂活化，真空热解和CO ₂活化，CO ₂气化和真空CO ₂气化过程。实验结果表明，通过真空CO ₂热解/气化过程从木材废料中产生具有高表面积和孔体积的炭和活性炭。研究了真空热解/气化操作变量对炭和活性炭性能的影响，以识别和优化温度，加热时间和加热速率。优化的真空CO发现_两个气化条件分别为温度800℃，加热速率20℃/ min和保持时间2h。通过氮物理吸附，扫描电子显微镜（SEM）对制得的木炭和活性炭进行了表征。傅立叶变换红外（FTIR）光谱确定了在不同制备阶段产生的表面官能团的任何变化。

图形摘要