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Ethanol dehydration activity on hydrothermally stable LaPxOy catalysts synthesized using CTAB template

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Abstract

Nanocrystalline LaPxOy with various starting P to La ratios from 0.5 to 2.0 catalysts were prepared by a sol–gel method using cetyl trimethylammonium bromide (CTAB) as template. The catalysts were thoroughly characterized by N2 physisorption, powder X-ray diffraction (XRD), temperature programmed desorption (TPD) of NH3, solid state 31P and 1H nuclear magnetic resonance (NMR), and transmission electron microscopy (TEM) techniques. XRD results indicate the presence of predominantly monazite LaPO4 with minor amounts of (≤3.0 wt%) rhabdophane LaPO4 phase in the samples with starting P/La ratios of 1.0 and 1.5. NH3-TPD results show an increasing trend in the total acidity with increase in P/La ratio. These catalysts were tested in the selective ethanol dehydration in the temperature range between 250 and 400 °C. The catalyst activity (μmol/h/m2) is increased with P/La ratio and the catalyst with highest P/La ratio of 2.0 exhibiting the highest ethanol dehydration activity. The ethanol conversion increased with reaction temperature, reaching 100% at 350 °C and remains unchanged at higher temperatures. On the other hand, the ethylene selectivity is also increased up to 350 °C and then decreased with further increase of reaction temperature. At a P/La ratio of 2, the CTAB templated LaPxOy catalyst showed higher catalytic activities compared to the LaPxOy by hydrothermal method without any template.

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Acknowledgments

This work was supported by the Science and Engineering Research Council of A*STAR (Agency for Science Technology and Research), Singapore. Authors also like to thank Ms. Ong Li Li and Dr. Chacko Jacob for their help in running solid state NMR experiments.

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Authors and Affiliations

  1. Institute of Chemical and Engineering Sciences (ICES), 1, Pesek Road, Jurong Island, Singapore, 627833, Singapore

    Kanaparthi Ramesh, C. G. Gwie, Chang Jie & Armando Borgna

  2. School of Materials Science and Engineering, Nanyang Technological University, Block N4.1, 50 Nanyang Avenue, Singapore, 639798, Singapore

    Yi Ling Eileen Goh & Timothy John White

  3. Australian National University, Electron Centre for Advanced Microscopy, GPO Box 475, Canberra, ACT, 2601, Australia

    Timothy John White

Authors
  1. Kanaparthi Ramesh
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  2. Yi Ling Eileen Goh
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  3. C. G. Gwie
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  4. Chang Jie
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  5. Timothy John White
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  6. Armando Borgna
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Correspondence to Kanaparthi Ramesh.

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Ramesh, K., Goh, Y.L.E., Gwie, C.G. et al. Ethanol dehydration activity on hydrothermally stable LaPxOy catalysts synthesized using CTAB template. J Porous Mater 19, 423–431 (2012). https://doi.org/10.1007/s10934-011-9490-9

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  • DOI: https://doi.org/10.1007/s10934-011-9490-9

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