Thermal pretreatment of willow branches impacts yield and pore development of activated carbon in subsequent activation with ZnCl<sub>2</sub> <i>via</i> modifying cellulose structure

Linghui Kong; Chao Li; Runxing Sun; Shu Zhang; Yi Wang; Jun Xiang; Song Hu; Dong Wang; Chuanjun Leng; Xun Hu

doi:10.1016/j.cjche.2024.01.014

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Thermal pretreatment of willow branches impacts yield and pore development of activated carbon in subsequent activation with ZnCl₂ via modifying cellulose structure

Updated：2026-01-06

- Thermal pretreatment of willow branches impacts yield and pore development of activated carbon in subsequent activation with ZnCl₂ via modifying cellulose structure
- Thermal pretreatment of willow branches impacts yield and pore development of activated carbon in subsequent activation with ZnCl₂ via modifying cellulose structure
- 中国化学工程学报（英文版） 2024年69卷第5期页码：227-237
- Affiliations：
  
  1. School of Material Science and Engineering, University of Jinan,Jinan,China,250022
  2. Joint International Research Laboratory of Biomass Energy and Materials, College of Materials Science and Engineering, Nanjing Forestry University,Nanjing,China,210037
  3. State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology,Wuhan,China,430074
  4. Shandong BASAN Graphite New Material Plant,Zibo,China,255311
- Author bio：
- Funds：
  
  This work was supported by the National Natural Science Foundation of China (52276195), Program for Supporting Innovative Research from Jinan (202228072);Program of Agricultural Development from Shandong (SD2019NJ015).
- DOI：10.1016/j.cjche.2024.01.014
  中图分类号：
- 纸质出版：2024
- Accepted：
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Linghui Kong, Chao Li, Runxing Sun, 等. Thermal pretreatment of willow branches impacts yield and pore development of activated carbon in subsequent activation with ZnCl₂ via modifying cellulose structure[J]. 中国化学工程学报（英文版）, 2024,69(5):227-237. DOI: 10.1016/j.cjche.2024.01.014.

Linghui Kong, Chao Li, Runxing Sun, Shu Zhang, Yi Wang, Jun Xiang, Song Hu, Dong Wang, Chuanjun Leng, Xun Hu. Thermal pretreatment of willow branches impacts yield and pore development of activated carbon in subsequent activation with ZnCl
Linghui Kong, Chao Li, Runxing Sun, 等. Thermal pretreatment of willow branches impacts yield and pore development of activated carbon in subsequent activation with ZnCl₂ via modifying cellulose structure[J]. 中国化学工程学报（英文版）, 2024,69(5):227-237. DOI: 10.1016/j.cjche.2024.01.014. DOI：

Linghui Kong, Chao Li, Runxing Sun, Shu Zhang, Yi Wang, Jun Xiang, Song Hu, Dong Wang, Chuanjun Leng, Xun Hu. Thermal pretreatment of willow branches impacts yield and pore development of activated carbon in subsequent activation with ZnCl DOI： 10.1016/j.cjche.2024.01.014.

摘要

Abstract

Development of pore structures of activated carbon (AC) from activation of biomass with ZnCl

relies on content and structure of cellulose/hemicellulose in the feedstock. Thermal pretreatment of biomass could induce dehydration and/or aromatization to change the structure of cellulose/hemicellulose. This might interfere with evolution of structures of AC

which was investigated herein

via

thermal pretreatment of willow branch (WB) from 200 to 360 ℃ and the subsequent activation with ZnCl

at 550 ℃. The results showed that thermal pretreatment at 360 ℃ (WB-360) could lead to substantial pyrolysis to form biochar

with a yield of 31.9%

accompanying with nearly complete destruction of cellulose crystals and remarkably enhanced aromatic degree. However

cellulose residual in WB-360 could still be activated to form AC-360 with specific surface area of 1837.9 m

·g

-1

which was lower than that in AC from activation of untreated WB (AC-blank

2077.8 m

·g

-1

). Nonetheless

the AC-200 from activation of WB-200 had more developed pores (2113.9 m

·g

-1

) and superior capability for adsorption of phenol

due to increased permeability of ZnCl

to the largely intact cellulose structure in WB-200. The thermal pretreatment did increase diameters of micropores of AC but reduced the overall yield of AC (26.8% for AC-bl

ank

versus

18.0% for AC-360)

resulting from accelerated cracking but reduced intensity of condensation.

In-situ

infrared characterization of the activation showed that ZnCl

mainly catalyzed dehydration

dehydrogenation

condensation

and aromatization but not cracking

suppressing the formation of derivatives of cellulose and lignin in bio-oil. The thermal pretreatment formed phenolic -OH and CO with higher chemical innerness

which changed the reaction network in activation

shifting morphology of fibrous structures in AC-blank to “melting surface” in AC-200 or AC-280.

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Thermal pretreatment of willow branches impacts yield and pore development of activated carbon in subsequent activation with ZnCl₂ via modifying cellulose structure

Thermal pretreatment of willow branches impacts yield and pore development of activated carbon in subsequent activation with ZnCl₂ via modifying cellulose structure

DOI：10.1016/j.cjche.2024.01.014

摘要

Abstract

关键词

Keywords

references

Thermal pretreatment of willow branches impacts yield and pore development of activated carbon in subsequent activation with ZnCl2 via modifying cellulose structure

Thermal pretreatment of willow branches impacts yield and pore development of activated carbon in subsequent activation with ZnCl2 via modifying cellulose structure

DOI：10.1016/j.cjche.2024.01.014

摘要

Abstract

关键词

Keywords

references

Thermal pretreatment of willow branches impacts yield and pore development of activated carbon in subsequent activation with ZnCl₂ via modifying cellulose structure

Thermal pretreatment of willow branches impacts yield and pore development of activated carbon in subsequent activation with ZnCl₂ via modifying cellulose structure