Reactivity of Metal Oxide Sorbents for Removal of Sulfur Compounds from Coal Gases at High Temperature and Pressure

• Published in: Separation science and technology Vol. 32; no. 1-4; pp. 775 - 792
• Main Authors: Kwon, K. C., Crowe, E. R., Gangwal, S. K.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Basingstoke Taylor & Francis Group 01.01.1997; Taylor & Francis
• Subjects: Air pollution caused by fuel industries; Applied sciences; Energy; Energy. Thermal use of fuels; Exact sciences and technology; Pollution reduction; Stack gas and industrial effluent processing; Ternary compound; Combustion gas desulfurization; Hydrogen Sulfides; Reactivity; Coal gas; Zinc Oxides; High temperature; Absorption with reaction; Sorbent; Flue gas purification; High pressure; Titanium Oxides
• ISSN: 0149-6395; 1520-5754
• DOI: 10.1080/01496399708003229

Hot-gas desulfurization for the integrated gasification combined cycle (IGCC) process has been investigated to effectively remove hydrogen sulfide with various metal oxide sorbents at high temperatures and pressures. Metal oxide sorbents such as zinc titanate oxide, zinc ferrite oxide, copper oxide, manganese oxide, and calcium oxide were found to be promising sorbents in comparison with other removal methods such as membrane separation and reactive membrane separation. The removal reaction of H 2 S from coal gas mixtures with zinc titanate oxide sorbents was conducted in a batch reactor. The main objectives of this research are to formulate promising metal oxide sorbents for removal of hydrogen sulfide from coal gas mixtures, to compare reactivity of a formulated sorbent with a sorbent supplied by the Research Triangle Institute at high temperatures and pressures, and to determine effects of concentrations of moisture contained in coal gas mixtures, and to determine effects of concentrations of moisture contained in coal gas mixtures on equilibrium absorption of H 2 S into metal oxide sorbents. Promising durable metal oxide sorbents with high-sulfur-absorbing capacity were formulated by mixing active metal oxide powders with inert metal oxide powders and calcining these powder mixtures.