Abstract
Gold nanocluster has been reported to have high activity and selectivity for various liquid phase hydrogenation reactions. In this study, gold clusters were loaded on various supports, i.e., TiO2, ZnO, Fe2O3, ZrO2, and CeO2. The Au-cluster catalysts were prepared by deposition-precipitation method using HAuCl4 as the precursor. These catalysts were characterized by X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy. The catalytic properties of these catalysts were studied in a batch slurry reactor for hydrogenation of p-chloronitrobenzene (p-CNB) at 1.1 MPa H2 pressure, 373 K and 300 rpm. The activity decreased in the following order: Au/TiO2 ≧ Au/ZnO ≧ Au/CeO2 (Nikki) ≧ Au/CeO2 (Evonik) ≧ Au/Fe2O3 ≧ Au/ZrO2. TiO2-supported Au clusters had a higher activity than others, due to its hydrophilicity.
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