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Sintering of Colloidal Ru/γ-Al2O3 Catalyst in Hydrogen

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Abstract

Colloidal 5.1 wt% Ru/γ-Al2O3 catalyst was prepared by a microwave assisted, solvothermal reduction of RuCl3 in ethylene glycol in the presence of γ-Al2O3. The catalyst subjected to heat-treatment in hydrogen up to 700 °C, was characterized by BET, XRD, TEM and H2 chemisorption. As-prepared catalyst contained Ru nanoparticles with mean size of 1.5 nm and narrow size distribution uniformly distributed over the support. The nanoparticles were stable on the alumina to 500 °C, but treatment at 600–700 °C caused some sintering of Ru due to migration and coalescence of a part of smallest ruthenium nanoparticles. However, even after H2 treatment at 700 °C, large amount of Ru nanoparticles with sizes of 1–3 nm remained in the catalyst. H2 chemisorption data revealed decrease of Ru dispersion from 0.28 to 0.19 by hydrogen treatment at 700 °C and were in good correspondence with TEM results. On the contrary, mean crystallite sizes obtained from XRD were strongly overestimated.

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Acknowledgments

This work was financially supported by the Polish Ministry of Science and Higher Education (Grant No. 1 TO9B-084-30). The authors are very grateful to Mrs. Ludwina Krajczyk for TEM studies, Dr. Mirosław Zawadzki for recording XRD patterns and to Mrs. Anna Cielecka for help in adsorption measurements.

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Authors and Affiliations

  1. Division of Nanomaterials Chemistry and Catalysis, Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, Wrocław 2, 50-950, Poland

    Janina Okal & Leszek Kępiński

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  1. Janina Okal
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  2. Leszek Kępiński
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Correspondence to Janina Okal.

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Okal, J., Kępiński, L. Sintering of Colloidal Ru/γ-Al2O3 Catalyst in Hydrogen. Catal Lett 128, 331–336 (2009). https://doi.org/10.1007/s10562-008-9733-9

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  • DOI: https://doi.org/10.1007/s10562-008-9733-9

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