Silica material variation for the MnxOy-Na2WO4/SiO2

Yildiz, M.; Aksu, Yilmaz; Simon, U.; Otremba, Torsten; Kailasam, K.; Göbel, C.; Girgsdies, Frank; Görke, O.; Rosowski, Frank; Thomas, A.; Schomäcker, Reinhard; Arndt, Sebastsian

doi:10.1016/j.apcata.2016.06.034

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Silica material variation for the Mn_xO_y-Na₂WO₄/SiO₂

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Girgsdies, Frank
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Yildiz, M., Aksu, Y., Simon, U., Otremba, T., Kailasam, K., Göbel, C., et al. (2016). Silica material variation for the Mn_xO_y-Na₂WO₄/SiO₂. Applied Surface Science, 525, 168-179. doi:10.1016/j.apcata.2016.06.034.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002B-18D9-3

Abstract

The oxidative coupling of methane (OCM) is one of the best methods for the direct conversion of methane.Among the known OCM catalysts, Mn_xO_y-Na₂WO₄/SiO₂ is a promising candidate for an industrial appli-cation, showing a high methane conversion and C₂ selectivity, with a good stability during long-termcatalytic activity tests. In the present study, some results have been already published and discussedbriefly in our previous short communication. However, we herein investigated comprehensively theinfluence of various silica support materials on the performance of the Mn_xO_y-Na₂WO₄/SiO₂ systemin the OCM by means of ex situ and in situ XRD, BET, SEM and TEM characterization methods andshowed new results to reveal possible support effects on the catalyst. The catalytic performance of most Mn_xO_y-Na₂WO₄/SiO₂ catalysts supported by different silica support materials did not differ substan-tially. However, the performance of the SBA-15 supported catalyst was outstanding and the methaneconversion was nearly twofold higher in comparison to the other silica supported catalysts at similar C₂ selectivity as shown before in the communication. The reason of this substantial increase in performancecould be the ordered mesoporous structure of the SBA-15 support material, homogeneous dispersion ofactive components and high number of active sites responsible for the OCM.