Thermal decomposition of SO₃
by Hidetoshi Karasawa, Akira Sasahira, Kuniyoshi Hoshino
International Journal of Nuclear Hydrogen Production and Applications (IJNHPA), Vol. 1, No. 2, 2006

Abstract: The iodine–sulphur and the Westinghouse methods are recognised as thermochemical methods for producing hydrogen from water. Thermal decomposition of SO₃ is an important process in both methods. This study used a flow-type apparatus to evaluate the decomposition of SO₃ to SO₂ and O₂. The SO₃ decomposition rate was measured by the temperature dependence of oxygen concentration using a chemical kinetic model and the reaction was assumed to be a homogeneous reaction of first order. The decomposition rate constant without catalyst was estimated to be 2.23 × 10¹² exp(–39,295/T) s^-1. When hematite was used as the catalyst, the decomposition rate constant increased to 6.79 × 10⁵ exp(–20,021/T) s^-1. A chemical dynamics calculation showed the decomposition ratio of SO₃ for cases with the catalyst reached 0.9 within about 20 sec at 1173 K. Catalyst use would be effective for decreasing the size of a SO₃ decomposer at temperatures lower than 1273 K.

Online publication date: Tue, 07-Nov-2006

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