426277 Catalytic Conversion of Algae in Methanol and Ethanol to Biodiesel

Wednesday, November 11, 2015: 1:20 PM
257B (Salt Palace Convention Center)
Le Yang, Tianjin University, Tianjin, China

This study demonstrated a one-step direct liquefaction and conversion of algae to biodiesel in methanol and ethanol with the catalysis of HZSM-5 (Si/2Al=50, 38, 25) and Y (HY(Si/2Al=10), NaY(Si/2Al=10) and USY(Si/2Al=12)) zeolites at a temperature range of 250 to 300 oC for 1 h. In the condition of no catalyst, bio-oil yield decreased with the increasing temperature. From 250-300 oC, the bio-oil decreased from 90%- 63% in methanol while the bio-oil decreased from 83% to 72% in ethanol. Gel permeation chromatography (GPC) results showed that weight-average molecular weight of bio-oil obtained in ethanol was a lot higher than that obtained in methanol. The weight-average molecular weight of bio-oil obtained in ethanol ranged from 2498 to 1977 and that obtained in methanol ranged from1571 to 1364 with temperature decreasing from 300 to 250 oC. TG/DTG results of the reaction solid residue gave an insight of the solid residue composition. TG/DTG showed that the residue composition obtained in methanol had a smaller molecular weight than that obtained in ethanol because the exothermic peaks showed at a relatively lower temperature using methanol than using ethanol. With the presence of the catalysts at 300 oC, bio-oil yield achieved in methanol was lower than that in ethanol. Wherevers, light bio-oil portion was higher in methanol than that in ethanol. The application of catalyst of both HZSM-5 and Y zeolites increased the light bio-oil content. Also higher acidity of the catalyst promoted higher light bio-oil content, the reason may be because that strong acidity promoted cracking reactions which converted large molecular compounds in the heavy oil to smaller compounds in the light oil.

Extended Abstract: File Not Uploaded
See more of this Session: Advances in Algal Biorefineries II
See more of this Group/Topical: Sustainable Engineering Forum