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Calcined hydrotalcites of varying Mg/Al ratios supported Rh catalysts: highly active mesoporous and stable catalysts toward catalytic partial oxidation of methane

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Abstract

Catalytic partial oxidation of methane to produce syngas were studied over calcined hydrotalcites of varying Mg/Al ratios supported Rh catalysts. Hydrotalcites of varying Mg/Al ratios were prepared using their hydroxide precursors and intercalating them with amino acid lysine. Upon calcination, these hydrotalcites converted into their mixed metal oxides having mesoporosity and used directly as support materials for the synthesis of rhodium catalysts. Rh dispersion, size of the nanoparticles, and metal-support interactions were found to strongly influence the activity of the catalyst and their stability. Feed composition, gas hourly space velocity, and temperature were found to influence the catalyst activity, CO/H2 ratio, and CO/CO2 selectivity. Alumina and alumina-rich calcined hydrotalcites exhibit higher catalytic activity, but carbon formation and aggregation were prominent. In contrast, MgO and MgO-rich calcined hydrotalcite supported Rh catalysts exhibit moderate activity; however, they were resistant against particle sintering and carbon formation. Long-term testings of these catalysts were carried out, and it was observed that calcined hydrotalcites of varying Mg/Al ratios supported Rh catalysts were promising candidates as stable and active catalysts toward catalytic partial oxidation of methane.

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Acknowledgments

The statements made herein are solely the responsibility of the authors. Tibra Mozammel sincerely acknowledge RMIT for the PhD fellowship and Dr. Jim Patel (CSIRO, Gas processing facilities) for providing permission to use the catalyst testing facilities.

Funding

This work was carried by the NPRP grant # NPRP11S-1221-170116 from the Qatar National Research Fund (a member of Qatar Foundation).

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Authors and Affiliations

  1. Centre for Advanced Materials and Industrial Chemistry, School of Science, RMIT University, Melbourne, Australia

    Tibra Mozammel, Deepa Dumbre, PR Selvakannan & Suresh K. Bhargava

  2. Centre for Advanced Materials, Qatar University, Doha, Qatar

    Kishor Kumar Sadasivuni

Authors
  1. Tibra Mozammel
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  2. Deepa Dumbre
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  3. PR Selvakannan
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  4. Kishor Kumar Sadasivuni
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  5. Suresh K. Bhargava
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Correspondence to PR Selvakannan or Suresh K. Bhargava.

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Mozammel, T., Dumbre, D., Selvakannan, P. et al. Calcined hydrotalcites of varying Mg/Al ratios supported Rh catalysts: highly active mesoporous and stable catalysts toward catalytic partial oxidation of methane. emergent mater. 4, 469–481 (2021). https://doi.org/10.1007/s42247-020-00158-2

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