Please use this identifier to cite or link to this item: http://hdl.handle.net/2067/47017
Title: Effect of torrefaction temperature on spent coffee grounds thermal behaviour and kinetics
Authors: Cardarelli, Alessandro
Pinzi, Sara
Barbanera, Marco 
Journal: RENEWABLE ENERGY 
Issue Date: 2022
Abstract: 
The paper aimed to investigate the influence of the torrefaction temperature (210, 235, 260 °C) on the kinetic and thermodynamic parameters, as well as the reaction mechanism during combustion of spent coffee grounds (SCGs). Non-isothermal thermogravimetric experiments were carried out at four heating rates, namely, 5, 7, 10, and 15 °C/min. Thermogravimetric (TG) and differential thermogravimetric (DTG) results showed torrefaction temperature firstly increases and then decreases the combustion reactivity, reaching the best value for the sample SCGs-235. Starink, Kissinger-Akahira-Sunose (KAS) and Ozawa-Flynn-Wall (OFW) iso-conversional models, master plots method and the compensation effect method were used to calculate the combustion kinetic triplet of the samples. The activation energy of the samples decreased with torrefaction temperature increasing, from 199.76 kJ/mol to 168.91 kJ/mol (with the Starink model). All the combustions were best explained by a reaction order model whose order decreased with the elevated torrefaction temperature and the heating rate of the combustion process. Using kinetic parameters obtained from the Starink method, thermodynamic parameters (enthalpy, Gibbs free energy, and entropy) were also determined, showing that SCGs seemed to be more suitable for the torrefaction at 235–260 °C. The study findings can provide practical information for modelling and designing combustion reactors for clean biofuel production from SCGs.
URI: http://hdl.handle.net/2067/47017
ISSN: 1879-0682
DOI: 10.1016/j.renene.2021.12.116
Appears in Collections:A1. Articolo in rivista

Files in This Item:
File Description SizeFormat Existing users please
1-s2.0-S0960148121018437-main.pdf1.85 MBAdobe PDF    Request a copy
Show full item record

SCOPUSTM   
Citations 20

18
Last Week
1
Last month
2
checked on Apr 9, 2024

Page view(s)

42
Last Week
0
Last month
0
checked on Apr 17, 2024

Download(s)

2
checked on Apr 17, 2024

Google ScholarTM

Check

Altmetric


All documents in the "Unitus Open Access" community are published as open access.
All documents in the community "Prodotti della Ricerca" are restricted access unless otherwise indicated for specific documents