Effects of dry and wet torrefaction pretreatment on microalgae pyrolysis analyzed by TG-FTIR and double-shot Py-GC/MS

Gan, Yong Yang and Chen, Wei-Hsin and Ong, Hwai Chyuan and Sheen, Herng-Kuang and Chang, Jo-Shu and Hsieh, Tzu-Hsien and Ling, Tau Chuan (2020) Effects of dry and wet torrefaction pretreatment on microalgae pyrolysis analyzed by TG-FTIR and double-shot Py-GC/MS. ENERGY, 210. ISSN 03605442, DOI https://doi.org/10.1016/j.energy.2020.118579.

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TG-FTIR and double-shot Py-GC/MS were executed to investigate the effects of torrefaction pretreatment on microalga (Chlorella vulgaris ESP-31) pyrolysis. TG-FTIR was performed to analyze the pyrolysis and combustion gas of raw and wet torrefied microalgae, whereas double-shot Py-GC/MS was applied to investigate the product distributions of single and two-stage thermal degradation of the microalgae. From the result, wet torrefaction successfully eliminated the release of CO in the pyrolysis gas. The highest generation of C-H during pyrolysis was achieved by the microalgae pretreated with dilute sulfuric acid. In the combustion gas, the intensity of O-H absorption band was removed in the first stage after wet torrefaction. The Py-GC/MS analysis revealed that the fatty acids (48.22%) were the dominant component in the bio-oil derived from the microalgae pretreated by the dilute sulfuric acid in wet torrefaction. Meanwhile, the productivity of carbohydrate-derived products (anhydrous sugars) decreased from 18.58 to 0.39% in the pyrolytic bio-oil after the wet torrefaction pretreatment. In contrast, carbohydrate- and lipid-derived products were decreased in the bio-oil after the dry torrefaction pretreatment. Similarly, microwave-assisted wet torrefaction in sulfuric acid is an effective pretreatment technique to produce high-quality pyrolytic bio-oil for biofuel production. (C) 2020 Elsevier Ltd. All rights reserved.

Item Type: Article
Funders: SATU (Grant No. ST014-2018, ST022-2019, ST023-2019), Ministry of Education, Ministry of Higher Education, Malaysia (Grant No. IIRG004C-19IISS), Universiti Malaya, Ministry of Science and Technology, Taiwan (Grant No. 109-2221-E-006-040-MY3, MOST 109-3116-F-006-016-CC1), National Cheng Kung University
Uncontrolled Keywords: Chlorella vulgaris; Wet torrefaction; Thermochemical conversion; TG-FTIR and Py-GC/MS; Biofuel; Microalgae pyrolysis
Subjects: Q Science > QR Microbiology
Divisions: Faculty of Science > Institute of Biological Sciences
Depositing User: Ms Zaharah Ramly
Date Deposited: 28 Dec 2023 13:17
Last Modified: 28 Dec 2023 13:17
URI: http://eprints.um.edu.my/id/eprint/36284

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