KINETICS OF SULFUR TRANSFER FROM H2S TO ALPHA-AG2+XS

The rate of sulfur transfer across the gas/solid interface involving H 2S(g) and alpha-Ag2+xS surface has been investigated using resistance relaxation measurements at 300 degrees C. The rate of the oxidation re action incorporating sulfur into Ag2+xS has been found to decrease wit h sulfur activity in the sample as (alpha(S))-1/2 while the rate of th e reduction reaction corresponding to the sulfur loss is found to incr ease with the sulfur activity as (alpha S)(1/2). The rate-limiting ste p has been identified to be H2S + 2e(-) = S2- (ad) + H-2