Methyl ester production from sunflower and waste cooking oils using alkali-doped metal oxide catalysts

Karavalakis, G; Anastopoulos, G; Stournas, S

dc.contributor.author	Karavalakis, G	en
dc.contributor.author	Anastopoulos, G	en
dc.contributor.author	Stournas, S	en
dc.date.accessioned	2014-03-01T01:33:44Z
dc.date.available	2014-03-01T01:33:44Z
dc.date.issued	2010	en
dc.identifier.issn	0888-5885	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/20563
dc.subject.classification	Engineering, Chemical	en
dc.subject.other	Active site	en
dc.subject.other	Biodiesel production	en
dc.subject.other	Calcination temperature	en
dc.subject.other	Catalyst reusability	en
dc.subject.other	Free fatty acid	en
dc.subject.other	Homogeneous catalyst	en
dc.subject.other	Loading concentration	en
dc.subject.other	Metal oxide catalysts	en
dc.subject.other	Metal oxides	en
dc.subject.other	Methyl esters	en
dc.subject.other	Molar ratio	en
dc.subject.other	Oil conversion	en
dc.subject.other	Reaction time	en
dc.subject.other	Sunflower oil	en
dc.subject.other	Waste cooking oil	en
dc.subject.other	ZnO	en
dc.subject.other	Biodiesel	en
dc.subject.other	Calcination	en
dc.subject.other	Esterification	en
dc.subject.other	Esters	en
dc.subject.other	Face recognition	en
dc.subject.other	Fatty acids	en
dc.subject.other	Metallic compounds	en
dc.subject.other	Methanol	en
dc.subject.other	Reusability	en
dc.subject.other	Vegetable oils	en
dc.subject.other	Zinc oxide	en
dc.subject.other	Catalyst activity	en
dc.title	Methyl ester production from sunflower and waste cooking oils using alkali-doped metal oxide catalysts	en
heal.type	journalArticle	en
heal.identifier.primary	10.1021/ie101270e	en
heal.identifier.secondary	http://dx.doi.org/10.1021/ie101270e	en
heal.language	English	en
heal.publicationDate	2010	en
heal.abstract	The purpose of this study was to investigate a series of alkali-doped metal oxide catalysts for their activity in the transesterification of sunflower oil and waste cooking oil with methanol. The metal oxides used as supports were Al2O3 and ZnO loaded with KHCO3 and KNO3, respectively, at various concentrations and calcined at different temperatures. These catalysts appeared to be promising candidates to replace homogeneous catalysts for biodiesel production as the reaction times and catalyst amount are low enough in order to achieve high ester yields. In most cases, the increase in loading concentration favorably influenced oil conversion. On the other hand, at calcination temperatures above 750 °C, a noticeable drop in biodiesel yield was observed which may be ascribed to decomposition effects of the active sites. In general, the use of sunflower oil resulted in higher ester yields when compared to waste cooking oil which was characterized by a high amount of free fatty acids and moisture. Biodiesel ester content was also strongly related with catalyst amount, methanol to oil molar ratio, reaction time, and catalyst reusability. © 2010 American Chemical Society.	en
heal.publisher	AMER CHEMICAL SOC	en
heal.journalName	Industrial and Engineering Chemistry Research	en
dc.identifier.doi	10.1021/ie101270e	en
dc.identifier.isi	ISI:000284454600039	en
dc.identifier.volume	49	en
dc.identifier.issue	23	en
dc.identifier.spage	12168	en
dc.identifier.epage	12172	en