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Thermogravimetric study of Chlorella vulgaris for syngas production


Citation

Abdul Raheem and S., Sivasangar and Wan Ab. Karim Ghani, Wan Azlina and Yap, Taufiq Yun Hin and Danquah, Michael K. and Harun, Mohd Razif (2015) Thermogravimetric study of Chlorella vulgaris for syngas production. Algal Research, 12. pp. 52-59. ISSN 2211-9264

Abstract

The present study investigates the thermal degradation behavior of Chlorella vulgaris using a thermogravimetric analyzer (TGA) to explore application as feedstock for syngas production. The biomass was heated continuously from room temperature to 1000 °C at different heating rates (5, 10 and 20 °C min− 1) under N2/air conditions at a constant flow rate of 25 mL min− 1. Experimental results showed that the combustion process of C. vulgaris can be divided into three major phases; (1) moisture removal, (2) devolatilization of carbohydrates, protein and lipids and (3) degradation of carbonaceous material. A degradation rate of 80% was obtained at the second phase of the combustion process in the presence of air whilst a degradation rate of 60% was obtained under N2 atmosphere at the same phase. The biomass was further gasified for syngas production using a Temperature Programmed Gasifier (TPG). The effect of three different process variables, temperature, microalgal loading, and heating rate was investigated. The maximum H2 production was found at 800 °C temperature with a biomass loading of 0.5 g. No significant effect of heating rate was observed on H2 production. The activation energy values, based on the Kissinger method, were evaluated to be 45.38 ± 0.5 kJ mol− 1 (1st stage), 61.20 ± 0.5 kJ mol− 1 (2nd stage) and 97.22 ± 0.5 kJ mol− 1 (3rd stage). The results demonstrate a significant potential for the utilization of the microalgae biomass as feedstock for large-scale production of syngas via gasification.


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Additional Metadata

Item Type: Article
Divisions: Faculty of Engineering
Faculty of Science
DOI Number: https://doi.org/10.1016/j.algal.2015.08.003
Publisher: Elsevier
Keywords: Chlorella vulgaris; Microalgae; Biomass; Thermogravimetric analysis; Gasification; Syngas
Depositing User: Nida Hidayati Ghazali
Date Deposited: 23 Apr 2018 02:08
Last Modified: 23 Apr 2018 02:08
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1016/j.algal.2015.08.003
URI: http://psasir.upm.edu.my/id/eprint/46728
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