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Biodiesel production from sunflower oil by tungsten oxide supported on zirconium doped MCM-41 silica

Biodiesel production from sunflower oil by tungsten oxide supported on zirconium doped MCM-41 silica,10.1016/j.molcata.2010.11.035,Journal of Molecula

Biodiesel production from sunflower oil by tungsten oxide supported on zirconium doped MCM-41 silica  
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A series of zirconium doped MCM-41 silica supported WOx solid acid catalysts, with WO3 loading ranging from 5 to 25wt%, has been prepared by impregnation with ammonium metatungstate. After activation at 700°C, these catalysts are active in the transesterification of sunflower oil with methanol at 200°C, with a biodiesel yield higher than 80% after 2.5h of reaction. The maximum activity (82wt% of FAME yield) is found for the catalyst with 15wt% WO3 loading, which is able to simultaneously catalyze the esterification and transesterification of simulated used oils, with an acidity degree as high as 9.1%. Moreover, this catalytic activity is maintained in the presence of 5wt% of water and after three cycles of reutilisation, without any treatment of the catalyst.
Journal: Journal of Molecular Catalysis A-chemical - J MOL CATAL A-CHEM , vol. 335, no. 1, pp. 205-209, 2011
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