Evaluations of catalysts for wet oxidation waste management in CELSS

Catalytic Oxidation in Supercritical Water

“…As compared to gas-phase oxidation, catalytic reactions in supercritical fluids often form much less coke on the catalyst surface (Adschiri et al, 1991;Baptist-Nguyen and Subramaniam, 1992;Ding, 1995;Dooley and Knopf, 1987;Fan et al, 1991Fan et al, , 1992Frisch, 1995;Gabbito et al, 1988;Ginosar and Subramaniam, 1994;Monos and Hofmann, 1991;Subramaniam, 1990, 1991;Tiltscher et al, 1981Tiltscher et al, , 1984Tiltscher and Hofmann, 1987;Fujimoto, 1989, 1991;. The coke precursor, if it is formed on the catalyst surfaces, can be carried out by SCW because of the high miscibility of organic Noble Metals Pd/TiO2-ZrO2, Ru/TiO2, Pt, Ru wastewater Mitsui et al, 1989;Yamada et al, 1990;Chowdhury et al, 1975;Oguchi et al, 1992;Imamura et al, 1988 Generally, it appears that solid-state transformations of a catalyst are primarily responsible for catalyst deactivation in laboratory studies. In these studies, high-purity reactants and oxidants are used to avoid catalyst poisoning by unwanted impurities.…”

Novel Production Method for Plant Polyphenol from Livestock Excrement Using Subcritical Water Reaction

“…There has been another method to develop the electric power station with supercritical water reactor to treat the livestock excrements in a company Miyazaki Biomass Recycle (Miyazaki, Japan), Shizuoka University (Shizuoka, Japan), and the Japan Aerospace Exploration Agency (JAXA) [2][3][4], the former with chicken excrement and the latter two with cattle excrement. In this case, however, the livestock excrement as a natural resource decomposes into carbon dioxide gas (CO 2 ) and water (H 2 O).…”