(92a) Hydrothermal Liquefaction of Municipal Solid Waste Using Binary Transition Metal Oxide (BTMO) Nanoparticles

Shende, R., South Dakota School of Mines and Technology
Amar, V. S., South Dakota School of Mines and Technology
Shende, A., South Dakota School of Mines and Technology
Sol-gel derived iron based binary transition metal oxide (BTMO) nanoparticles obtained at calcination temperatures of 600-800oC were investigated as catalytic materials for the hydrothermal liquefaction (HTL) of the municipal solid waste. Prior to liquefaction reaction, the powdered BTMO nanoparticles were analyzed using x-ray diffraction, scanning electron microscopy and BET surface area analyzer. The hydrothermal liquefaction of a slurry containing 10-20 wt.% solid waste was carried at temperatures of 250-325oC. Following the HTL reaction, the recovered aqueous phase was characterized by HPLC and GC-MS. The analysis indicated the presence of alcohols, ethers, esters, ketones, phenols, and carboxylic acids. From the recovered biochar, bio-oil was extracted using acetone/ethanol. The higher heating value (HHV) of the oil was found to be approx. 35 MJ/kg. The biochar was sonicated to convert into submicron particles and graphitized in an inert atmosphere and analyzed by BET surface area analyzer. The powdered carbon obtained has utility as a soil amendment material, filtration media, and electrode for a supercapacitor. Detailed synthesis method for BTMO catalyst, yields of different products and coproducts after HTL, utilization of biochar as electrode material, and HHV of the oils recovered will be presented.