Spherical activated carbons for low concentration toluene adsorption

摘要: Abstract The activation process of a spherical activated carbon (SAC) from Kureha Carbon was analysed and the behaviour these materials to adsorb low concentration volatile organic compounds studied. Two series carbons were prepared using CO2 or steam as activating atmospheres at 880 840 °C, respectively. Activation times between 45 min 24 h selected, leading burn-offs 21 60%. results show, for similar burn-off percentages, that porosity development is two gases moderate larger than high percentages. For burn-offs, leads SACs with slightly bed densities CO2. In general, increase in total surface oxygen groups’ content noted after both agents. Toluene adsorption capacities large 46 g toluene/100 g SAC can be achieved some continuous flow-through bed, when influent air-phase toluene 200 ppmv. Considering have quite densities, their per unit volume reach remarkably values.