(38b) Model Aldehyde Chemistry Using Cezrox Catalyst for Hydrothermal Liquefaction Upgrading
In preliminary runs, use of CeZrOx increased oil yields relative to other commonly used catalysts in the HTL conversion of food waste at 300 Â°C and 20.7 MPa. Subsequently, tests were performed to expose CeZrOx to hot liquid water conditions at 300 Â°C and 20.7 MPa for up to 165 hours. Post-run characterization was performed using both XRD and XPS to verify the hydrothermal stability of CeZrOx, Model HTL reactions using CeZrOx were also performed with water soluble alcohols, aldehydes, ketones and carboxylic acids as reactants. CeZrOx had minimal activity for catalyzing reactions involving alcohol-alcohol, carboxylic acid-carboxylic acid or ketone-ketone coupling. In contrast, CeZrOx was highly active â and selective â for aldehyde coupling reactions, with the primary product being alkenes. For example, pentanal self-condensation reactions under HTL conditions produced a decene product that phase separated into an oil phase at room conditions. On-going work is focused on optimizing the catalyst properties and catalytic reactor conditions.