Preparation of the Mn/gamma-Al2O3 acceptor for high temperature regenerative H2S removal

An alumina supported manganese acceptor can be used for high temperature re generative removal of hydrogen sulfide. Such an acceptor was prepared by a wet impregnation method on a 10 kg scale. A porous alumina carrier with a s ize of 50 to 70 microns was impregnated with a manganese acetate solution. The impregnation slurry was centrifuged and dried in a microwave oven. The impregnation parameters and drying conditions were investigated. It is show n that this impregnation process is dominated by the solution penetrating t he pores. The manganese loading of the acceptor was estimated based on the concentration of the impregnating solution. This showed a good agreement wi th the results of AAS (Atom Absorption Spectrometer) measurements. The micr owave drying time needed was calculated by a heat balance over the drying s ystem. The preparation exhibited a good reproducibility and the accepters p repared have better dispersion and less initial deactivation.