Thermogravimetric Analysis (TGA) Raw and Processed Data for the Co-Pyrolysis of Macadamia Nutshells and Coffee Husks

Published: 28 April 2025| Version 1 | DOI: 10.17632/h3pjg2f926.1
Contributors:
OCIDENT BONGOMIN,
,
,

Description

This dataset contains raw and processed thermogravimetric analysis (TGA) data used in the study titled “Synergistic and Antagonistic Interactions in the Co-Pyrolysis of Macadamia Nutshells and Coffee Husks: Thermogravimetric, Kinetic, and Thermodynamic Insights.” The experiments were conducted to investigate the thermal decomposition behavior of macadamia nutshells (MS), coffee husks (CH), and their blends under inert nitrogen atmosphere. The dataset includes: Raw TGA Data: Original mass loss and temperature data recorded during pyrolysis experiments for MS, CH, and three different blend ratios (CH75MS25, CH50MS50, CH25MS75). Processed Data (Excel format): Calculated derivative thermogravimetric (DTG) curves, conversion (α) values, peak decomposition temperatures (Tp), onset/endset temperatures, and degradation rates. OriginPro Project Files (.opj): Plotting files containing TGA and DTG curves, including annotations for key thermal events. Supporting Metadata: Experimental conditions (heating rate, sample mass, gas flow rate, instrument settings) and sample descriptions. All data are organized systematically to facilitate reproducibility of the thermal analysis and kinetic modeling. Researchers can use this dataset for further kinetic studies, master plot analysis, thermodynamic calculations, or comparative evaluation with other biomass materials.

Files

Steps to reproduce

This dataset contains raw and processed thermogravimetric analysis (TGA) data for macadamia nutshells (MS), coffee husks (CH), and their blends (CH75MS25, CH50MS50, and CH25MS75). It supports the reproduction of thermal degradation analysis, kinetic modeling, and thermodynamic parameter calculations as described in the associated research article. To reproduce the results: TGA and DTG Curve Analysis: Open the raw Excel files for each sample. Plot mass (%) versus temperature (°C) to generate TGA curves. Compute the first derivative of mass with respect to temperature (d(mass)/dT) to obtain DTG curves, indicating the decomposition behavior and peak decomposition temperatures (Tp). Use the pre-calculated conversion data provided in the processed Excel files. Activation Energy (Ea) Estimation: Estimate activation energy using two approaches: Correlation-Based Method: Utilize the peak decomposition temperature (Tp) and the heating rate (10 °C/min) with the correlation equations specified in the manuscript. Kissinger Method: Apply the Kissinger equation to calculate the pre-exponential factor (A) and activation energy based on Tp and heating rate. Reaction Mechanism Identification (Master Plot Analysis): Normalize the experimental conversion data and construct master plots. Compare the plots against theoretical model curves (e.g., diffusion, reaction order, nucleation-growth models) to determine the dominant kinetic mechanisms across different conversion degrees. Thermodynamic Parameter Calculation: Using the determined activation energy and frequency factor, calculate thermodynamic parameters: Enthalpy change (ΔH) Gibbs free energy change (ΔG) Entropy change (ΔS) Apply the standard thermodynamic relationships provided in the manuscript. Plot Reproduction: Use the supplied OriginPro (.opj) project files to access pre-generated TGA and DTG plots for all samples. These files allow direct reproduction, customization, or export of high-quality figures. Experimental Metadata: Experimental conditions include a heating rate of 20 °C/min, inert nitrogen atmosphere at 50 mL/min, and a sample mass of approximately 10 mg. These conditions should be used when replicating experiments or analyzing the provided data. Software Requirements: Microsoft Excel (or compatible spreadsheet software) for data handling and basic plotting. OriginPro software for accessing and modifying the provided plotting files. Alternative analysis can be performed using Python, MATLAB, or R for users preferring custom calculations.

Institutions

Moi University School of Engineering, Ain Shams University, Ain Shams University Faculty of Engineering, Moi University

Categories

Activation Energy, Thermal Analysis, Pyrolysis, Reaction Mechanism, Thermodynamic Analysis, Synergism, Valorization of Bioresources, Biomass Conversion, Macadamia Nuts

Funding

SPREE

ACE II-PTRE

Licence