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The effect of the preparation on the catalytic activity of ZnO/TiO2 in the methanol steam reforming reaction

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Abstract

ZnO/TiO2 catalysts, with different compositions, have been synthesized by wetness impregnation of TiO2 in Zn(NO3)2 water solution and by precipitation of ZnCO3 in the presence of TiO2, characterized by X-ray diffraction and surface area measurements and tested in the methanol steam reforming reaction. The methanol conversion, the hydrogen yield and the CO selectivity were compared for composition, for synthesis methods and for surface area. The activity resulted proportional to the surface area for both kind of preparations. Precipitated catalyst had higher surface area. Nevertheless, impregnation method gave better performances, in term of methanol conversion, hydrogen yield and CO selectivity. XRD gave evidence of a more crystalline structure for impregnated catalysts than for precipitated ones. This higher crystallinity allows for better electronic interactions between ZnO and TiO2, which is probably responsible for the better catalytic performance. Using GHVSCH3OH = 5 × 104 h−1 impregnated catalyst with χZn ≤ 0.22 reached methanol conversion completeness at T = 400 °C with CO selectivity = 2% and gave GHVSH2 = 14.5 × 104 h−1 at 400 °C and 4.5 × 104 h−1 at 350 °C. CO selectivity resulted invariant with respect to methanol conversion, giving information about possible reaction pathway.

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Acknowledgements

We wish to thank Dr. P. Caffarelli for Surface Area and AA measurements.

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  1. Istituto di Scienze del Patrimonio Culturale - CNR, Via Salaria Km 29.300, 00016, Monterotondo Scalo, Rome, Italy

    F. Pinzari

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Pinzari, F. The effect of the preparation on the catalytic activity of ZnO/TiO2 in the methanol steam reforming reaction. Reac Kinet Mech Cat 134, 23–35 (2021). https://doi.org/10.1007/s11144-021-02044-2

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