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Bimetallic NiMo-supported Al2O3@TiO2 core-shell microspheres with high hydrodeoxygenation efficiency toward syringol

  • Original Paper: Nano-structured materials (particles, fibers, colloids, composites, etc.)
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Abstract

In this work, bimetallic NiMo-supported Al2O3@TiO2 core-shell microspheres were developed for the hydrodeoxygenation (HDO) of syringol. First, multi-grams of bimetallic NiMo-supported Al2O3 microspheres containing 20 wt% Ni and 10 wt% Mo were prepared by combining sol-gel and spray pyrolysis (NiMo@Al2O3). Afterwards, a TiO2 anatase shell was decorated onto the surfaces of NiMo@Al2O3 microspheres by hydrolysis of titanium (IV) butoxide with the assistance of an inhibitor. The fabricated NiMo@Al2O3@TiO2 spheres were characterized by XRD, FE-SEM, HR-TEM, N2 adsorption-desorption, XPS, and H2-TPR analyses. The results indicate that Ni and Mo species were incorporated well into the γ-Al2O3 microspheres, which were finely coated by a TiO2 anatase shell layer. HDO experiments showed that the spray pyrolysis-derived bimetallic NiMo-supported catalysts effectively converted syringol with a conversion of ~100% at 270 °C for 3 h, but the hydrocarbon selectivity was still low (~40.3%). By decorating a TiO2 layer shell onto the NiMo@Al2O3 microspheres, enhancing the hydrocarbon selectivity up to ~97%, which included methyl-substituted cyclohexanes (~87.7%), cyclohexane (~2%), and 1,1′-bi(cyclohexane) (~7.3%). The findings suggest that coating the NiMo@Al2O3 microspheres containing high catalyst contents with a hydrophobic shell resulted in a synergetic effect that improved the HDO performance.

Graphical Abstract

Hydrodeoxygenation of syringol over spray pyrolysis-derived catalysts (A) NiMo@Al2O3 and (B) NiMo@Al2O3@TiO2 core-shell microspheres

Highlights

  • NiMo@Al2O3 microspheres were rapidly fabricated by the spray pyrolysis.

  • TiO2 shell layer was decorated over the NiMo@Al2O3 microspheres.

  • NiMo@Al2O3@TiO2 catalyst had 100% HDO conversion toward syringol.

  • NiMo@Al2O3@TiO2 catalyst exhibited a good stability.

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Acknowledgements

This work is supported by the Industrial University of Ho Chi Minh City. The author also thanks Professor Jinsoo Kim at Chemical Engineering Department for his support.

Funding

This research is funded by Vietnam National Foundation for Science and Technology Development (NAFOSTED) under grant number 104.05-2020.32. This work is supported by the Industrial University of Ho Chi Minh City.

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  1. Chemical Engineering Department, Industrial university of Ho Chi Minh City, 12 Nguyen Van Bao, Go Gap, Ho Chi Minh City, Vietnam

    The Ky Vo

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TKV: Conceptualization, investigation, formal analysis, writing manuscript, visualization, editing & reviewing.

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Vo, T.K. Bimetallic NiMo-supported Al2O3@TiO2 core-shell microspheres with high hydrodeoxygenation efficiency toward syringol. J Sol-Gel Sci Technol 105, 804–813 (2023). https://doi.org/10.1007/s10971-023-06068-z

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