Cerium-manganese mixed oxides for high temperature H2S removal and activity comparisons with V-Mn, Zn-Mn, Fe-Mn sorbents

Yasyerli S.

CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION, vol.47, no.4, pp.577-584, 2008 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 47 Issue: 4
  • Publication Date: 2008
  • Doi Number: 10.1016/j.cep.2006.11.016
  • Journal Name: CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.577-584
  • Keywords: H2S sorption, CeO2, mixed oxides, Mn, Fe, zn, V, CU-V, ELEMENTAL SULFUR, REGENERABLE SORBENTS, SELECTIVE OXIDATION, DESULFURIZATION, KINETICS, MO, HYDROGEN
  • Gazi University Affiliated: Yes

Abstract

High temperature H,S sorption activities of cerium-manganese mixed oxide sorbents containing different molar ratios of Ce/Mn and pure CeO2, prepared by the complexation technique, were investigated in a fixed bed flow reactor. Sulfur retention capacity and the H2S sorption rate of CeO2 were significantly enhanced by the incorporation of Mn into the sorbent. Cerium-manganese mixed oxide having a Ce/Mn ratio of 1/3 showed very high sorption rate. Another advantageous feature of this sorbent was its excellent regeneration properties. No deactivation of this sorbent was observed after 10 successive sulfidation-regeneration cycles. Also about 90% of the retained sulfur was converted to elemental sulfur instead of SO2, during regeneration step. The H2S Sorption rate constant observed at 600 degrees C with the Cel-Mn3 mixed oxide sorbent was also found to be much higher than the corresponding values for Zn-Mn, V-Mn and Fe-Mn mixed oxide sorbents prepared in this study. (C) 2006 Elsevier B.V. All rights reserved.