Preparation and catalytic activity of thermosensitive Ga2O3 nanorods

Vijay Bhooshan Kumar, Rahul Kumar Mishra, Indra Neel Pulidindi, Ze'Ev Porat, John H.T. Luong, Aharon Gedanken

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21 Scopus citations


Gallium oxide (β-Ga2O3) nanorods were prepared by ultrasonic irradiation of molten gallium in warm water to form α-GaO(OH). This precursor was then subjected to calcination in air at 600 °C for 3 h to form β-Ga2O3, as confirmed by X-ray diffraction (XRD). Field emission scanning electron microscopy (FE-SEM)/high-resolution transmission electron microscopy (HRTEM) micrographs revealed the formation of well-organized nanotubes/nanorods with homogeneous size distribution. The average length of the β-Ga2O3 nanorods was affected by the temperature of the water during sonication, decreasing from 480 to 72 nm with an increase in the temperature from 25 to 50 °C. A sharp decline in the particle size was also observed when the temperature was above 35 °C. The catalytic activity of the β-Ga2O3 nanorods was examined, as a model, during the dehydration reaction of xylose to furfural. Furfural is a versatile biomass-derived platform compound used for the synthesis of several strategic chemicals. This nanoscale catalyst has a large surface area, which enhances its catalytic activity and enables it to completely convert xylose to furfural at 150 °C within 12 h without any trace of byproducts, as confirmed by high-performance liquid chromatography (HPLC), 13C nuclear magnetic resonance (NMR), and 1H NMR. The XRD pattern of the used β-Ga2O3 nanorods was identical to that of pristine Ga2O3, indicating the possible reusability of this catalyst. β-Ga2O3 was reused for more reduction cycles, with similar results to the freshly prepared β-Ga2O3. HPLC analysis demonstrated that the selectivity of furfural is up to 94% compared to the 30% obtained with GaO(OH) as a catalyst.

Original languageEnglish
Pages (from-to)7419-7427
Number of pages9
JournalEnergy & Fuels
Issue number9
StatePublished - 15 Sep 2016

Bibliographical note

Funding Information:
Aharon Gedanken thanks the Israel Ministry of Science and Technology for the Research Grant 3-99763 and the Israel Science Foundation for supporting the research via Grant 598/12.

Publisher Copyright:
© 2016 American Chemical Society.


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