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Vanadium phosphate catalysts for biodiesel production from acid industrial by-products.
MedLine Citation:
PMID:  22902409     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Biodiesel production from high acidity industrial by-products was studied using heterogeneous acid catalysts. These by-products contain 26-39% of free fatty acids, 45-66% of fatty acids methyl esters and 0.6-1.1% of water and are consequently inadequate for direct basic catalyzed transesterification. Macroporous vanadyl phosphate catalysts with V/P=1 (atomic ratio) prepared via sol-gel like technique was used as catalyst and it was possible to produce in one reaction batch a biodiesel contain 87% and 94% of FAME, depending on the by-product used as raw material. The initial FAME content in the by-products had a beneficial effect on the reactions because they act as a co-solvent, thus improving the miscibility of the reaction mixture components. The water formed during esterification process seems to hinder the esters formation, possibly due to competitive adsorption with methanol and to the promotion of the FAME hydrolysis reaction.The observed catalyst deactivation seems to be related to the reduction of vanadium species. However, spent catalysts can be regenerated, even partially, by reoxidation of the reduced vanadium species with air.
Authors:
Carina Domingues; M Joana Neiva Correia; Renato Carvalho; Carlos Henriques; João Bordado; Ana Paula Soares Dias
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-8-9
Journal Detail:
Title:  Journal of biotechnology     Volume:  -     ISSN:  1873-4863     ISO Abbreviation:  J. Biotechnol.     Publication Date:  2012 Aug 
Date Detail:
Created Date:  2012-8-20     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8411927     Medline TA:  J Biotechnol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 Elsevier B.V. All rights reserved.
Affiliation:
CPQ & IBB & ICEMS, Instituto Superior Técnico, Technical University of Lisbon, Av. Rovisco Pais, s/n, 1049-001 Lisboa, Portugal.
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