Enabling nitrogen physisorption of sub-500℃ biochar <italic style="font-style: italic">via</italic> surface removal of condensed pyrolysis vapors

Raoof Bardestani; Mohammadreza Sanasiri

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Enabling nitrogen physisorption of sub-500℃ biochar via surface removal of condensed pyrolysis vapors

Updated：2026-08-24

- Enabling nitrogen physisorption of sub-500℃ biochar via surface removal of condensed pyrolysis vapors
- Chinese Journal of Chemical Engineering Vol. 94, Issue 6, Pages: 26-35(2026)
- Affiliations：
  
  Département de Génie Chimique, Pavillon Adrien-Pouliot, Université Laval, Québec,QC, G1V 0A6, Canada
  Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran 1136594655, Iran
- Author bio：
  
  Corresponding author. E-mail address: raoof.bardestani.1@ulaval.ca(R. Bardestani)
- Funds：
- DOI：
  CLC：
- Received：11 June 2025，
  
  Revised：2026-01-01，
  
  Accepted：14 January 2026，
  
  Online First：24 March 2026，
  
  Published：2026-06
- Accepted：
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Raoof Bardestani, Mohammadreza Sanasiri. Enabling nitrogen physisorption of sub-500℃ biochar via surface removal of condensed pyrolysis vapors[J]. Chinese Journal of Chemical Engineering, 2026, 94(6): 26-35.
DOI：

Raoof Bardestani, Mohammadreza Sanasiri. Enabling nitrogen physisorption of sub-500℃ biochar via surface removal of condensed pyrolysis vapors[J]. Chinese Journal of Chemical Engineering, 2026, 94(6): 26-35. DOI：

摘要

Abstract

This research provides insights into the characteristics of biochar produced through pyrolysis below 500℃. These biochars often show surface inaccessibility due to pore blockage caused by heavy condensed vapors

known as tar

generated during biomass pyrolysis. The N

adsorption-desorption isotherms

determining the Brunauer-Emmett-Teller specific surface area(BET-SSA)

were initially investigated after Soxhlet solvent extraction of the tar from a biochar obtained by pyrolyzing spruce-based biomass at 475℃. Solvent extraction proved to be a relatively effective method

allowing N

gas molecules to access the pores. However

this objective was achieved only with appropriate polar aprotic solvents such as dimethyl sulfoxide

resulting in an SSA of 21 m

·g

- 1

. The SSA development of the untreated biochar was then studied using different vacuum degassing conditions implementing response surface methodology. The degassing temperature

a k

ey parameter that affects factors such as sample mass and degassing time

should be kept below 400℃ to preserve the surface morphology of the biochar.

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Keywords

references

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Enabling nitrogen physisorption of sub-500℃ biochar via surface removal of condensed pyrolysis vapors

DOI：

摘要

Abstract

关键词

Keywords

references