Mn-Cu and Mn-Cu-V mixed-oxide regenerable sorbents for hot gas desulfurization


Karayilan D., Dogu T., Yasyerli S., Dogu G.

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, vol.44, no.14, pp.5221-5226, 2005 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 44 Issue: 14
  • Publication Date: 2005
  • Doi Number: 10.1021/ie0492496
  • Title of Journal : INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
  • Page Numbers: pp.5221-5226

Abstract

Porous Mn-Cu and Mn-Cu-V mixed-oxide sorbents prepared by the complexation technique were tested for high-temperature removal of H2S in the presence of hydrogen gas. Sorption experiments carried out at 627 T in a fixed-bed reactor showed higher reactivity and also higher sulfur retention capacity (over 0.15 g of S/g of sorbent) for the Mn-Cu mixed oxide than for the Mn-Cu-V mixed oxide. Successive sulfidation-regeneration cycles demonstrated that the MnCu mixed oxide was also more stable than Mn-Cu-V, maintaining its activity and about 90% of its sulfur retention capacity at the end of five cycles. Although formation of some MnSO4 was observed during regeneration at 700 T with a gas mixture containing 6% oxygen in nitrogen, this did not cause significant reduction in the activity of this mixed-oxide sorbent. It was also shown that a previously proposed deactivation model gave good predictions of the experimental breakthrough curves obtained with these sorbents.