Importance of Size and Distribution of Ni Nanoparticles for the Hydrodeoxygenation of Microalgae Oil

Authors

  • Wenji Song,

    1. Department of Chemistry and Catalysis Research Center, Technische Universität München, Garching 85747 (Germany), Fax: (+49) 89-28913544
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  • Dr. Chen Zhao,

    Corresponding author
    1. Department of Chemistry and Catalysis Research Center, Technische Universität München, Garching 85747 (Germany), Fax: (+49) 89-28913544
    • Department of Chemistry and Catalysis Research Center, Technische Universität München, Garching 85747 (Germany), Fax: (+49) 89-28913544
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  • Prof. Dr. Johannes A. Lercher

    Corresponding author
    1. Department of Chemistry and Catalysis Research Center, Technische Universität München, Garching 85747 (Germany), Fax: (+49) 89-28913544
    2. Institute for Integrated Catalysis, Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland WA 99352 (USA)
    • Department of Chemistry and Catalysis Research Center, Technische Universität München, Garching 85747 (Germany), Fax: (+49) 89-28913544
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Abstract

Improved synthetic approaches for preparing small-sized Ni nanoparticles (d=3 nm) supported on HBEA zeolite have been explored and compared with the traditional impregnation method. The formation of surface nickel silicate/aluminate involved in the two precipitation processes are inferred to lead to the stronger interaction between the metal and the support. The lower Brønsted acid concentrations of these two Ni/HBEA catalysts compared with the parent zeolite caused by the partial exchange of Brønsted acid sites by Ni2+ cations do not influence the hydrodeoxygenation rates, but alter the product selectivity. Higher initial rates and higher stability have been achieved with these optimized catalysts for the hydrodeoxygenation of stearic acid and microalgae oil. Small metal particles facilitate high initial catalytic activity in the fresh sample and size uniformity ensures high catalyst stability.

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