Sol-gel synthesized lithium orthosilicate as a reusable solid catalyst for biodiesel production

Nguyen, HC; Pan, JW; Su, CH; Ong, HC; Chern, JM; Lin, JY

Sol-gel synthesized lithium orthosilicate as a reusable solid catalyst for biodiesel production

Nguyen, HC Pan, JW Su, CH Ong, HC Chern, JM Lin, JY

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Publisher:: John Wiley and Sons
Publication Type:: Journal Article
Citation:: International Journal of Energy Research, 2021, 45, (4), pp. 6239-6249
Issue Date:: 2021-01-01

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Field	Value	Language
dc.contributor.author	Nguyen, HC
dc.contributor.author	Pan, JW
dc.contributor.author	Su, CH
dc.contributor.author	Ong, HC
dc.contributor.author	Chern, JM
dc.contributor.author	Lin, JY
dc.date.accessioned	2021-09-24T20:03:59Z
dc.date.available	2021-09-24T20:03:59Z
dc.date.issued	2021-01-01
dc.identifier.citation	International Journal of Energy Research, 2021, 45, (4), pp. 6239-6249
dc.identifier.issn	0363-907X
dc.identifier.issn	1099-114X
dc.identifier.uri	http://hdl.handle.net/10453/150692
dc.description.abstract	© 2020 John Wiley & Sons Ltd Lithium orthosilicate (Li4SiO4) is a promising solid catalyst for biodiesel synthesis. However, Li4SiO4 is traditionally prepared by a solid-state reaction, which results in the unstable activity for the reaction. In the present study, Li4SiO4 was successfully prepared using a simple sol-gel method and employed as an efficient solid alkali catalyst for biodiesel synthesis. The molar ratio of precursors and calcination temperature were optimized for the synthesis of Li4SiO4 by using the sol-gel method. The physical and chemical properties were determined using X-ray diffraction, scanning electron microscopy, laser diffraction particle size, and thermogravimetric analysis. The as-prepared Li4SiO4 catalyst had much smaller particle size, pore volume, and pore size, but higher surface area and basicity than Li4SiO4 catalyst prepared by the solid-state reaction. It was then used to transesterify methanol and soybean oil into biodiesel. The effect of reaction factors (reaction time from 1 to 3 hours, catalyst concentration from 3 to 9%; molar ratio of methanol to oil from 6:1 to 18:1, and temperature from 55°C to 75°C) on the Li4SiO4-catalyzed transesterification was systematically examined. The highest biodiesel conversion of 91% was reached under the following conditions: reaction time of 2 hours, Li4SiO4 concentration of 6%, 12:1 methanol:oil molar ratio, and temperature of 65°C. Notably, Li4SiO4 could be efficiently reused for at least 10 times without significant loss of its activity; this suggests that the sol-gel synthesized Li4SiO4 is a potential solid alkali catalyst for biodiesel synthesis.
dc.language	English
dc.publisher	John Wiley and Sons
dc.relation.ispartof	International Journal of Energy Research
dc.relation.isbasedon	10.1002/er.6246
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0904 Chemical Engineering, 0906 Electrical and Electronic Engineering, 0913 Mechanical Engineering
dc.subject.classification	Energy
dc.title	Sol-gel synthesized lithium orthosilicate as a reusable solid catalyst for biodiesel production
dc.type	Journal Article
utslib.citation.volume	45
utslib.for	0904 Chemical Engineering
utslib.for	0906 Electrical and Electronic Engineering
utslib.for	0913 Mechanical Engineering
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Information, Systems and Modelling
utslib.copyright.status	closed_access	*
pubs.consider-herdc	false
dc.date.updated	2021-09-24T20:03:57Z
pubs.issue	4
pubs.publication-status	Published
pubs.volume	45
utslib.citation.issue	4

Abstract:

© 2020 John Wiley & Sons Ltd Lithium orthosilicate (Li4SiO4) is a promising solid catalyst for biodiesel synthesis. However, Li4SiO4 is traditionally prepared by a solid-state reaction, which results in the unstable activity for the reaction. In the present study, Li4SiO4 was successfully prepared using a simple sol-gel method and employed as an efficient solid alkali catalyst for biodiesel synthesis. The molar ratio of precursors and calcination temperature were optimized for the synthesis of Li4SiO4 by using the sol-gel method. The physical and chemical properties were determined using X-ray diffraction, scanning electron microscopy, laser diffraction particle size, and thermogravimetric analysis. The as-prepared Li4SiO4 catalyst had much smaller particle size, pore volume, and pore size, but higher surface area and basicity than Li4SiO4 catalyst prepared by the solid-state reaction. It was then used to transesterify methanol and soybean oil into biodiesel. The effect of reaction factors (reaction time from 1 to 3 hours, catalyst concentration from 3 to 9%; molar ratio of methanol to oil from 6:1 to 18:1, and temperature from 55°C to 75°C) on the Li4SiO4-catalyzed transesterification was systematically examined. The highest biodiesel conversion of 91% was reached under the following conditions: reaction time of 2 hours, Li4SiO4 concentration of 6%, 12:1 methanol:oil molar ratio, and temperature of 65°C. Notably, Li4SiO4 could be efficiently reused for at least 10 times without significant loss of its activity; this suggests that the sol-gel synthesized Li4SiO4 is a potential solid alkali catalyst for biodiesel synthesis.

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http://hdl.handle.net/10453/150692