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Simultaneous transesterification and esterification of unrefined or waste oils over ZnO-La2O3 catalysts

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Abstract
A single-step method was developed for biodiesel production from unrefined or waste oils using a series
of heterogeneous zinc and lanthanum mixed oxides. Effects of metal oxide molar ratio, free fatty acids
(FFA) and water content in feedstock, molar ratio of methanol and oil, and reaction temperature on the
yield of biodiesel were investigated. A strong interaction between Zn and La species was observed with
enhanced catalyst activities. Lanthanum promoted zinc oxide distribution, and increased the surface acid
and base sites. The catalyst with 3:1 ratio of zinc to lanthanum was found to simultaneously catalyze the
oil transesterification and fatty acid esterification reactions, while minimizing oil and biodiesel
hydrolysis. A reaction temperature window of 170–220 8C was found for the biodiesel formation. A high
yield (96%) of fatty acid methyl esters (FAME) was obtained within 3 h even using unrefined or waste oils.

Keywords: Biodiesel, Unrefined and waste oils, Transesterification, Esterification, Hydrolysis

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Informasi Detail

Judul Seri

Applied Catalysis A: General

No. Panggil

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Penerbit

London : Elsevier B.V.., 2009

Deskripsi Fisik

Applied Catalysis A: General 353 (2009) 203–212

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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