mo co mg mn w k na ca ba la v ta nb re zr cr ag sn and the like the metals or their respective oxides may be employed individually or in combination the preferred metals are those of co ni and cu a preferred class of hydrogen sulfide sorbents are those which are regenerable as contrasted to those which bind sulfur irreversibly in a stoichiometric reaction active hydrogen sulfide sorbents regenerable through the sequential action of hydrogen and oxygen include iron cobalt nickel copper silver tin rhenium molybdenum and mixtures thereof these regeneration reactions may be facilitated by the inclusion of a catalytic agent that facilitates the oxidation or reduction reaction required to restore the sulfur sorbent to its initial active condition these regeneration processes operate over a temperature range of 200 700 u00b0 c preferably 250 600 u00b0 c and more preferably 275 500 u00b0 c at pressures of from 100 to 5000 psig 791 to 34 576 kpa the stage 4 catalysts have a high activity for hydrogenation and aromatic saturation the catalysts include group viii metals on a support preferred metals are ni pt and pd especially ni these metals are on the support in the reduced state i e as metals typical supports include silica alumina and m41s especially mcm 41 stage 4 reactions conditions include temperatures of from 150 to 300.