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Evaluation of required activity of SO$$_{3}$$ decomposition catalyst for iodine-sulfur process

Imai, Yoshiyuki; Kubo, Shinji; Goto, Minoru; Shimakawa, Satoshi; Tachibana, Yukio; Onuki, Kaoru

Required performance of SO$$_{3}$$ decomposition catalyst for Iodine-Sulfur process was investigated. Heat transfer area needed for shell and tube type SO$$_{3}$$ decomposer exchanging heat from VHTR was calculated by applying Yagi-Kunii and Zukauskas's equation for filled layer-SiC tube and SiC tube-He gas flow heat transfer respectively and the minimum space velocity for catalyst was 1000 h$$^{-1}$$. To transform minimum space velocity to more universal kinetic rate constant, we introduced forward/reverse SO$$_{3}$$ decomposition equation. To achieve equilibrium SO$$_{3}$$ decomposition ratio above 0.5 MPa, rate constant k$$_{1}$$ should be more than 1.5 s$$^{-1}$$ for SO$$_{3}$$ decomposition catalyst.

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