Mixed metal oxide and mixed metal oxide supported -ion exchanged zeolite sorbents for hot gas desulfurization

This study describes the evaluation of the mixed metal non-supported and supported ion exchanged sorbents for hot gas desulfurization capable of withstanding a wide temperature range and multiple sulfidation-regeneration cycles. Copper-cobalt, copper-cerium mixed metal oxide and mixed metal oxide supported- ions exchanged on natural zeolite (MMS-IZ) sorbents are studied in this work. Copper-cobalt mixed system is a good candidate for low temperature desulfurization while copper-cerium exhibits the high temperature stability and high performance. The reduced form of cerium oxide (CeOn) in copper-cerium reduced the H2S concentration to sub-ppmv level. The MMS-IZ sorbents also showed the high performance in desulfurization by surface interaction. Various combinations of these sorbents exhibited the high efficiency in H2S removal. The thermodynamic analysis of the single metal oxide systems and H2S concentration in equilibrium shows that the sulfidation is a strong function of temperature and can be calculated using Factsage 6.1 (GTT technologies).;Keyword: desulfurization, sorbent, regeneration, thermodynamic.