Comparative study of the two-zone fluidized-bed reactor and the fluidized-bed reactor for oxidative coupling of methane over Mn/Na2WO4/SiO2 catalyst |
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Authors: | A. Talebizadeh Y. Mortazavi A.A. Khodadadi |
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Affiliation: | aOil and Gas Center of Excellence, School of Chemical Engineering, University College of Engineering, University of Tehran, P.O. BOX 11155-4563, Tehran, Iran |
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Abstract: | In this work, oxidative coupling of methane over Mn/Na2WO4/SiO2 catalyst is studied in a two-zone fluidized-bed reactor (TZFBR) and its performance is compared with a fluidized-bed reactor (FBR). Diluted oxygen in argon was introduced into the bottom of the TZFBR through a quartz ferrite and methane was entered at higher positions along the fluidized bed. The catalyst circulated between the oxygen-rich and methane-rich zones in the TZFBR reactor. The effects of the main operating variables including bed temperature, the methane/oxygen ratio (Rmo), and the height at which methane was introduced into the reactor (Hm) were investigated. It is found that under some operating conditions the TZFBR gives a higher C2 selectivity than that obtained in the FBR reactor. Reaction of methane with lattice oxygen of the Mn/Na2WO4/SiO2 redox catalyst in the methane-rich zone may have led to the higher selectivity. |
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Keywords: | Oxidative coupling Methane Two-zone Fluidized Mn/Na2WO4/SiO2 Redox |
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