Activation of fluid coke for mercury removal from gases.

摘要

The treatments required to convert fluid coke, produced by Syncrude Canada, into high-surface areas activated coke and the ability of activated fluid coke to remove mercury from gas steams were studied. Physical activation methods, using mostly H2O-CO2 mixtures at T≤1800°C and P=100 to 620 kPa, were investigated. Surface areas >500 m2/g were obtained for some treatments; the average pore diameter for all activated cokes was about 2 nm. The Hg capture ability of activated fluid coke was evaluated using a pulse adsorption apparatus. Activated fluid coke particles with surface areas above 200 m2/g captured Hg from an argon stream at temperatures up to 150°C. Vapour impregnation of activated fluid coke with sulphur at temperatures above 400 to 600°C increased the amount of and temperature at which Hg was adsorbed. The optimum temperature for sulphur impregnation was 500°C; this sample strongly adsorbed Hg at temperature up to 250°C.