Download e-book for iPad: Advances in Photochemistry by Douglas C. Neckers, David H. Volman, Günther von Bünau

By Douglas C. Neckers, David H. Volman, Günther von Bünau

ISBN-10: 0471192899

ISBN-13: 9780471192893

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The methane that diffuses through the porous MgO phase comes in contact with the PbO, and converts into C2 products with the aid of the PbO lattice oxygen. The PbO phase remains active with the aid of the oxygen stream that is in contact with it. The lattice oxygen in PbO appears very active towards oxidizing CH4 into useful C2 products rather than towards unwanted CO or CO2 with a selectivity of better than 90 %. Due to the low oxygen transport through the PbO membrane the observed rates were rather low.

Since additional ongoing research on catalyst development has not born substantial results, emphasis in recent years has shifted on the application of novel reactors, among them membrane reactors. The application of membrane reactors to this reaction has been extensively studied. 127]). Different dense membranes, with or without the application of an external electrical potential (Otsuka et al. 129], Nagamoto et al. 130], Nozaki et al. 136]) have been utilized. 141]). 142]), commonly defined as the fraction of moles of CH4 that react which are converted to (C2H6 + C2H4).

Ru-BINAP is known to be an excellent hydrogenation catalyst Dehydrogenation Reactions 29 at ~60 bar of hydrogen. This, however, exceeds the upper operational pressure limit of most nanofiltration membranes (-30 bar). At these conditions the catalyst showed a lower activity, but still maintained its enantioselectivity. The polymeric membranes tested were shown to completely exclude the Ru-BINAP catalyst. The hybrid reactor system was tested for about a month, and showed very stable activity and enantioselectivity.

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Advances in Photochemistry by Douglas C. Neckers, David H. Volman, Günther von Bünau

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