Adsorption of aniline, benzene and pyridine from water on a copper oxide doped activated carbon (CuO/AC) at 30 ℃ and oxidation behavior of the adsorbed pollutants over CuO/AC in a temperature range up to 500 ℃ are investigated in TG and tubular-reactor/MS systems. Results show that the AC has little activity towards oxidation of the pollutants and CuO is the active oxidation site. Oxidation of aniline occurs at 231-349 ℃ and yields mainly CO2, H2O and N2. Oxidation of pyridine occurs at a narrower temperature range, 255-309 ℃, after a significant amount of desorption starting at 150 ℃. Benzene desorbs at temperatures as low as 105 ℃ and shows no sign of oxidation. The result suggests that adsorption-catalytic dry oxidation is suitable only for the strongly adsorbed pollutants. Oxidation temperatures of CuO/AC for organic pollutants are higher than 200 ℃ and pollutants desorbing easily at temperatures below 200 ℃ cannot be treated by the method.
Agency for Toxic Substances and Disease Registry, Toxicological profile for aniline, phenol, nitrobenzene, U.S. Department of Health and Human Services, 1999
Karanfil T, Kilduff JE, Environmental science and technology, Washington DC, 33, 3217, 1999