Priyanka Dhage - Cu Promoted ZnO/SiO2 Regenerable Sorbents for the Room Temperature Removal of H2S from the Reformate Streams

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      Publication Details (including relevant citation   information):

      Industrial Engineering and Chemistry Research,   DOI: 10.1021/ie100209a


      The Cu-ZnO/SiO2 sorbent for ultradeep adsorptive removal of H2S   from the reformate streams at room temperature was prepared and   tested, and characterization of the active sites was performed.   The Cu dopant significantly enhances desulfurization capacity of   ZnO/SiO2 sorbent at room temperature (up to 92% utilization of   ZnO), and the sorbent maintains a high sulfur uptake capacity   upon multiple cycles (up to 10) of regeneration by a simple   thermal oxidation in air. The “as-prepared” (“calcined”) sorbent   contains Cu in the Cu2+ form, O, Si, and Zn as ZnO, while the   “spent” (“sulfided”) sorbent contains Cu, O, Si, S, and Zn as the   ZnS form,as found by XPS. XRD suggests that both zinc and copper   compounds of the Cu-ZnO/SiO2 sorbent are nanodispersed. ESR   spectroscopy found that the “calcined” and “sulfided” Cu-ZnO/SiO2   sorbents contain Cu2+ in the single dispersion and coordination   state. During H2S adsorption, partial reduction of Cu2+ to
      Cu+ occurs: the higher Cu concentration in the sorbent, the lower   the reduction yield of Cu2+ to Cu+, thus correlating with sulfur   uptake capacity. The “deactivated” sorbent (10-11)   adsorption/regeneration cycles) is enriched with a different   chemical form of Cu2+, compared to the “as-prepared” sorbent.

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