Physicochemical characterization, thermal analysis and pyrolysis kinetics of lignocellulosic biomasses

Abstract

This paper compares and evaluates the physicochemical characterization and thermal analysis of different agricultural lignocellulosic biomasses namely: olive pomace (OP), argan shells (AS), date palm seeds (DS) and hydrochar (HC), obtained from the hydrothermal carbonization (HTC) of OP, in order to identify a good potential fuel for thermochemical conversion systems. Several physicochemical and thermal characterization methods were used. The aforementioned biomasses are mainly composed of cellulose, hemicellulose and lignin as shown by the FTIR and XRD analysis. From energy point of view, the hydrochar (HC) has the highest value of the higher heating value (HHV) (27.86 MJ/kg). These results make (HC) a very good candidate for thermochemical energy conversion technologies. Thereafter, thermal analysis (DSC and TGA) was conducted in an inert atmosphere to analyze the thermal behavior of the samples under well-defined thermal conditions. Right after, two kinetics models were used to estimate pyrolysis kinetic parameters (the activation energy (E) and pre-exponential factor (A)) of the four biomasses. Among those are, for example, olive pomace has (E = 200.104 kJ/mol; A = 7.14E + 21 s⁻¹) and (E = 199.053 kJ/mol; A = 3.58E + 21 s⁻¹) according to KAS and FWO models, respectively. Consequently, pyrolysis of (OP) requires less energy to occur, which promotes its energy performances.

GRAPHICAL ABSTRACT

Keywords:

• Biomass
• physicochemical analysis
• thermal analysis
• pyrolysis kinetics
• kinetic models

Acknowledgements

The authors gratefully acknowledge the support of the research institute ‘IRESEN’ for this work, via the BioF2S project funding.

Authors’ contributions

Ilias Bakhattar: Data Curation, Writing—Original draft, Writing—review & editing. Mohamed Asbik: Methodology, Formal analysis, Work Supervision, Project administration, Writing—review & editing. Abdelghani Koukouch: Methodology, Data Curation. Imane Aadnan: Methodology, Data Curation. Omar Zegaoui: Methodology, Data Curation. Veronica Belandria: Formal analysis, Writing—review & editing. Sylvie Bonnamy: Writing—review & editing, Brahim Sarh: Writing—review & editing.

Disclosure statement

No potential conflict of interest was reported by the authors.