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Report No.

Oxidation of dimethyl sulfide in air using electron-beam irradiation, and enhancement of its oxidation via an MnO$$_{2}$$ catalyst

Hakoda, Teruyuki; Chowdhury, M. A. Z.*; Shimada, Akihiko; Hirota, Koichi

The decomposition of dimethyl sulfide (DMS) at initial concentrations of 4.5-18.0 ppmv in air was studied under electron-beam (EB) irradiation. Doses to decompose 90% of input DMS were 2.5 kGy for 4.5 ppmv, 3.4 kGy for 10.6 ppmv, and 3.9 kGy for 18.0 ppmv. HCOOH, (CH$$_{3}$$)$$_{2}$$SO, and trace CH$$_{3}$$OH and (CH$$_{3}$$)$$_{2}$$SO$$_{2}$$ were produced as irradiation products in addition to CO$$_{2}$$ and CO. Application of an O$$_{3}$$ decomposition catalyst to an irradiated sample gas led to an enhancement in the oxidation of DMS and its products into CO$$_{2}$$ and the decomposition of O$$_{3}$$. For 10.6 ppmv DMS/air, the mineralization ratio increased from 41% via only EB irradiation to 100% via the combination treatment at 6.3 kGy. The yield of CO$$_{2}$$ to CO$$_{x}$$ increased from 5.3% to 87.6% by combination with catalytic oxidation. This combination treatment enables the irradiation energy used to deodorize gas streams containing DMS to be reduced.



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Category:Engineering, Chemical



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