Patent ID: 7909913

Claim:
A PSA process for the removal of hydrogen sulfide from a feed gas containing at least hydrogen sulfide as an impurity, said process comprising contacting the feed gas with an adsorbent for hydrogen sulfide, adsorbing hydrogen sulfide from said feed gas on said adsorbent to produce a hydrogen sulfide depleted feed gas, and periodically regenerating said adsorbent by desorption of hydrogen sulfide therefrom under PSA conditions wherein said adsorbent for hydrogen sulfide has a sulfur deposition rate of less than 0.04 wt % S per day H 2 S exposure when continuously exposed to a 1% H 2 S dry gas at 20° C. for seven (7) days; wherein the adsorbent comprising a silica gel having an SiO 2 content of at least 99.2%.