Journal
BIORESOURCE TECHNOLOGY
Volume 101, Issue 14, Pages 5374-5384Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2010.02.050
Keywords
Biodiesel; Solid acid catalyst; Sequential catalysis reaction process; Reaction and separation
Funding
- Foundation for the Natural Scientific Foundation of China [20736004, 20736007, 20606021]
- Specialized Research Fund for the Doctoral Program of Higher Education [20050003030]
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A solid acid catalyst that can keep high activity and stability is necessary when low cost feedstocks are utilized for biodiesel synthesis because the reaction medium contains a large amount of water. Three solid acid catalysts were prepared by the sulfonation of carbonized vegetable oil asphalt and petroleum asphalt. The structure of these catalysts was characterized by a variety of techniques. A new process that used the coupling of the reaction and separation was employed, which greatly improved the conversion of cottonseed oil (triglyceride) and free fatty acids (FFA) when a model waste oil feedstock was used. The vegetable oil asphalt-based catalyst showed the highest catalytic activity. This was due to the high density and stability of its acid sites, its loose irregular network, its hydrophobicity that prevented the hydration of -OH species, and large pores that provided more acid sites for the reactants. (C) 2010 Elsevier Ltd. All rights reserved.
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