Solid base catalytic hydrothermal liquefaction of macroalgae: Effects of process parameter on product yield and
Bijoy Biswas1, Avnish Kumar1, Alisha C Fernandes2
1Biomass Conversion Area (BCA), Material Resource Efficiency Division (MRED), CSIR-Indian Institute of Petroleum (IIP), Dehradun 248005, India; Academy of Scientific and Innovative Research (AcSIR), New Delhi, India.
Abstract:
The hydrothermal liquefaction (HTL) of Sargassum tenerrimum (ST) macroalgae was carried out for 15 min, over various solid base catalysts (CaO supported on CeO2, Al2O3, and ZrO2) at different reaction temperatures (260-300 °C), different catalyst quantities (5-25 wt%) and using different solvent systems. Maximum bio-oil (BO) yields for the non-catalytic HTL with single solvent water, ethanol, and water-ethanol co-solvent were 3.3 wt%, 23.3 wt%, and 32.0 wt%, respectively, at 280 °C. Ethanol as single solvent elicited highest BO yield of 25.2 wt% with CaO/ZrO2 (10.0 wt%) catalyst. However, the highest BO yield (33.0 wt%) accompanied by higher conversion (70.5%) was obtained with CaO/ZrO2 (10.0 wt%) under water-ethanol co-solvent. The selectively higher percentage of ester functional compounds (87.8%) was found with CaO/ZrO2 catalyst under water-ethanol co-solvent. Also, the bio-oil obtained from catalytic liquefaction showed a higher high heating value (HHV) compared to that from the non-catalytic HTL reaction.
Related Concept Videos
Microbial Bioremediation of Hydrocarbons
Production of Organic Acids
Biofuels


