Reactivity of Sorbents with Hot Hydrogen Sulfide in the Presence of Moisture and Hydrogen

• Published in: Separation science and technology 2003-01, Vol.38 (12-13), p.3289-3311
• Main Authors: Kwon, Kyung C., Park, YoonKook, Gangwal, Santosh K., Das, Kamalendu
• Format: Article
• Language: English
• Subjects: Coal gases; Gas clean-up; Gas-solid reaction; Hydrogen sulfide; IGCC; Intraparticle diffusion; Metal oxide sorbents; Surface reaction; Transport reactor
• ISSN: 0149-6395; 1520-5754
• DOI: 10.1081/SS-120022599

Hot-gas desulfurization for the integrated gasification combined cycle (IGCC) process has been investigated by many researchers to remove effectively hydrogen sulfide (H 2 S) with various metal oxide sorbents at elevated temperatures. Various metal oxide sorbents are formulated with metal oxides such as Fe, Co, Zn, and Ti. In this article, reactivity of AHI-1 sorbent, obtained from the Research Triangle Institute (RTI), was investigated. Initial reactivity of AHI-1 sorbent with hydrogen sulfide was studied in the presence of various amounts of moisture and hydrogen at various reaction temperatures. AHI-1 sorbent consists of 20-w% Fe 2 O 3 , 10-w% ZnO, and 70-w% spent fluid cracking catalyst (FCC). The objectives of this research were to study initial reaction kinetics for the AHI-1 sorbent-hydrogen sulfide heterogeneous reaction system, to investigate effects of concentrations of hydrogen sulfide, hydrogen, and moisture on dynamic absorption of H 2 S into the sorbent, to understand effects of space time of reaction gas mixtures on initial reaction kinetics of the sorbent-hydrogen sulfide system, and to evaluate effects of temperature and sorbent amounts on dynamic absorption of H 2 S into the sorbent. Experimental data on initial reaction kinetics of hydrogen sulfide with the metal oxide sorbent were obtained with a 0.83-cm 3 differential reactor. The sorbent in the form of 130-μm particles was reacted with 1000 to 4000 ppm hydrogen sulfide at 450 to 600°C. The range of space time of reaction gas mixtures is 0.03 to 0.09 s. The range of reaction duration is 4 to 14,400 s.