Articles written in Bulletin of Materials Science

    • A study on the synthesis, characterization and catalytic activity of ruthenium-substituted MFI (Mobil Five) zeolite


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      Hydrothermal synthesis was adapted to prepare a series of ruthenium (Ru)-incorporated Mobil Five (MFI)zeolite materials with silicon (Si) to aluminium (Al) ratio of 100 and with Al to Ru ratios 1:1, 2:1 and 3:1. An X-raydiffractometer (XRD) and FT-IR were employed to identify the formation of the zeolite phase. A favourable environmentwas maintained in the gel to overcome the difficulties of isomorphous substitution of ruthenium into the MFI framework. The unit cell volume change and the shift in XRD reflection positions showed a positive correlation with increased rutheniumcontent in the samples. UV–Vis (DRS) spectra confirmed the position of ruthenium in the T-site in the MFI structure.Thermogravimetric analysis was carried out for studying water and template removal patterns and also for studying thethermal stability of the synthesized samples. Formation of uniform rectangle- and twinned-rectangle-shaped MFI particleswith particle size approaching 27 $\mu$m was confirmed by scanning electron microscopy. Energy-dispersive X-ray analysis was carried out for quantification of Si, Al and Ru. The catalytic activities of the synthesized samples for the hydroxylation ofphenol was investigated, the major products being catechol and hydroquinone.

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