Nanometric titanium dioxide (TiO2) powder has been treated on the surface with octyltriethoxysilane in a supercritical carbon dioxide (scCO2) medium. The surface silanization conferred water repellency to the TiO2 powder. The effect of operating variables of the supercritical silanization process (pressure, temperature) on the surface characteristics of the material was analyzed. Finally, the e...

Results are reported from recent tests where hydrothermal flames spontaneously ignited in a Supercritical Water Oxidation (SCWO) Test Cell. Hydrothermal flames are generally categorized as flames that occur when appropriate concentrations of fuel and oxidizer are present in supercritical water (SCW); i.e., water at conditions above its critical point (218 atm and 374 °C). A co-flow injector was...

Biogas is one of the main biomass-energy resources. Its use for syngas production with a H2/CO ratio close to 2 would have huge environmental, social and economic impact in the actual energetic scenario. However, the use of dry reforming, where the two main components are transformed into syngas, does not allow the desired H2/CO ratio. For this reason, the addition of water is proposed. The pro...

Flexible composite films were produced by impregnating aqueous phenol formaldehyde (PF) resin into water-swollen cellulose nanofibril (CNF) films. CNF films were prepared using a pressurized filtration method in combination with freeze drying. The freeze-dried films were swollen with water then impregnated with PF resin by soaking in aqueous resin solutions of varying concentrations. Small amou...

The MODAR process uses supercritical water, heated above 374OC and pressurized above 220 atm, as a medium for the rapid and complete oxidation of organic compounds to carbon dioxide, water and inorganic salts. The destruction efficiencies achieved exceed 99.99% for a wide range of compounds including chlorinated solvents and PCB’s. The exothermic oxidation reaction produces sufficient energy to...