Kinetics modeling, thermodynamics and thermal performance assessments of pyrolytic decomposition of Moringa oleifera husk and Delonix regia pod

Ayokunle O Balogun,Armando G Mcdonald,Abdulbaset M Alayat,Peter P Ikubanni,Adekunle A Adeleke,Samuel O Adegoke

doi:10.1038/s41598-021-93407-1

Ayokunle O Balogun, Armando G Mcdonald + Show 4 more

Open Access

https://doi.org/10.1038/s41598-021-93407-1

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Abstract

A non-isothermal decomposition of Moringa oleifera husk and Delonix regia seed pod was carried out in an N2 pyrolytic condition with the primary objective of undertaking the kinetics modeling, thermodynamics and thermal performance analyses of the identified samples. Three different isoconversional models, namely, differential Friedman, Flynn–Wall–Ozawa, and Starink techniques were utilized for the deduction of the kinetics data. The thermodynamic parameters were deduced from the kinetic data based on a first-order chemical reaction model. In the kinetics study, a strong correlation (R2 > 0.9) was observed throughout the conversion range for all the kinetic models. The activation energy profiles showed two distinctive regions. In the first region, the average activation energy values were relatively higher—a typical example is in the Flynn–Wall–Ozawa technique—MH (199 kJ/mol) and RP (194 kJ/mol), while in the second region, MH (292 kJ/mol) and RP (234 kJ/mol). It was also demonstrated that the thermal process for the samples experienced endothermic reactions thought the conversion range. In summary, both the kinetic and thermodynamic parameters vary significantly with conversion—underscoring the complexity associated with the thermal conversion of lignocellulosic biomass samples.

Highlights

A non-isothermal decomposition of Moringa oleifera husk and Delonix regia seed pod was carried out in an N2 pyrolytic condition with the primary objective of undertaking the kinetics modeling, thermodynamics and thermal performance analyses of the identified samples
Whereas hemicellulose and lignin are amorphous in nature, cellulose has been noted for its high crystallinity[6,7]
The focus of the current study is to investigate the kinetics, and thermodynamics analyses of both agricultural residues (MH husk and regia pod (RP) pods) under pyrolytic conditions

Summary

Introduction

A non-isothermal decomposition of Moringa oleifera husk and Delonix regia seed pod was carried out in an N2 pyrolytic condition with the primary objective of undertaking the kinetics modeling, thermodynamics and thermal performance analyses of the identified samples. It was demonstrated that the thermal process for the samples experienced endothermic reactions thought the conversion range Both the kinetic and thermodynamic parameters vary significantly with conversion—underscoring the complexity associated with the thermal conversion of lignocellulosic biomass samples. Smith[2] estimated the soil carbon sequestration and biochar potential as 0.7 Gt carbon eq/year He noted that they potentially have minimal impact on land use, water, energy demand and cost, albedo, and nutrients; possessing fewer demerits relative to other NETs. in a life cycle assessment study of a large-scale slow-pyrolysis plant, Aziz et al.[3] opined that slow pyrolysis systems have the capacity to generate energy and ensure negative carbon emission. Of the seven notorious oxides of nitrogen, N 2O has been identified as an ozone-depleting material It is a greenhouse gas, which have a global warming potential of about 298 times that of C O2. Bio-oil can be further refined into improved quality fuels to replace gasoline, diesel, and chemicals obtained from non-renewable sources

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