Dynamic analysis of removal and selective oxidation of H2S to elemental sulfur over Cu-V and Cu-V-Mo mixed oxides in a fixed bed reactor


Yasyerli S., Dogu G., Ar I., Dogu T.

CHEMICAL ENGINEERING SCIENCE, vol.59, no.19, pp.4001-4009, 2004 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 59 Issue: 19
  • Publication Date: 2004
  • Doi Number: 10.1016/j.ces.2004.03.045
  • Title of Journal : CHEMICAL ENGINEERING SCIENCE
  • Page Numbers: pp.4001-4009
  • Keywords: reaction engineering, catalysis, selectivity, packed bed, H2S oxidation, mixed metal oxide catalysis, HOT-GAS DESULFURIZATION, HYDROGEN-SULFIDE, CATALYSTS, SORBENTS

Abstract

Selective oxidation of H2S to elemental sulfur was studied using the Cu-V and Cu-V-Mo mixed oxide catalysts with different O-2/H2S ratios between 0 and 3. High activities and high sulfur selectivities reaching 0.98 were obtained with the Cu-V catalyst. The Cu-V-Mo mixed oxide catalyst showed higher activity with a somewhat less selectivity. The Cu-V catalyst, which was originally in the form of alpha-Cu2V2O7, was converted to Cu3VS4, CuS and VOx during the initial stages of reaction. Oxidized form of the catalyst resulted in the formation of mostly SO2. Partially reduced catalyst containing V+2 and V+4 was highly selective for the production of elemental sulfur, which was produced by a series of redox reactions involving lattice oxygen. (C) 2004 Elsevier Ltd. All rights reserved.