Document Detail

Vanadium phosphate catalysts for biodiesel production from acid industrial by-products.
MedLine Citation:
PMID:  22902409     Owner:  NLM     Status:  Publisher    
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.
Carina Domingues; M Joana Neiva Correia; Renato Carvalho; Carlos Henriques; João Bordado; Ana Paula Soares Dias
Related Documents :
22560349 - Simultaneous extraction and derivatization of amino acids and free fatty acids in meat ...
3907829 - Comparative stability of 1-alkoxyalkyl alpha-d-glucosides in the presence of acid or al...
9078259 - Metabolism of 27-, 25- and 24-hydroxycholesterol in rat glial cells and neurons.
3902349 - Multiple alpha-keto aciduria in microtus montanus chronically infected with trypanosoma...
11316579 - Protection by thiols of the mitochondrial complexes from 4-hydroxy-2-nonenal.
7635149 - The folding and assembly pathway of tumour necrosis factor tnf alpha, a globular trimer...
17191849 - Metapleural- and postpharyngeal-gland secretions from workers of the ants solenopsis in...
3757269 - A simple method to diagnose adrenoleukodystrophy using a dried blood spot on filter paper.
24767069 - Nutritional quality of grains of sorghum cultivar grown under different levels of micro...
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.
CPQ & IBB & ICEMS, Instituto Superior Técnico, Technical University of Lisbon, Av. Rovisco Pais, s/n, 1049-001 Lisboa, Portugal.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Comparison between CT volume measurement and histopathological assessment of response to neoadjuvant...
Next Document:  Production of single chain fragment variable (scFv) antibodies in Escherichia coli using the LEX™ ...