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In this work, Au/GdPO 4 -rods were found to be good catalysts for CO oxidation with a low content of Au. The dopant of CePO 4 could influence the activity of Au/GdPO 4 due to the synergistic effect. GdPO 4 and CePO 4 nanorods were obtained by a hydrothermal process and the Au/GdPO 4 -rod and Au/Ce-GdPO 4 -rod catalysts were prepared by deposition-precipitation synthesis. The samples were extensively characterized by transmission electron microscopy (TEM), inductively coupled plasma (ICP), powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), ultraviolet-visible spectroscopy (UV-Vis), Fourier transform infrared spectroscopy (FT-IR), temperature programmed desorption (O 2 -TPD, CO-TPD, and CO 2 -TPD) and N 2 adsorption-desorption. The results showed that Au/GdPO 4 with a low Au content possessed good activity for CO oxidation. When the content of Ce is 25 at%, 0.5% Au/Ce-GdPO 4 -rods can convert CO completely at 65 °C, and the catalyst showed better high-temperature resistance than 0.5% Au/GdPO 4 -rods. 0.5% Au/Ce-GdPO 4 -rods also showed good stability at reaction temperatures of 55 and 65 °C with CO conversions of 90% and 100% after continuous operation for 12 h. They also showed no deactivation after 50 h at a relative high reaction temperature of 200 °C.

The influence of CePO4 nanorods on the CO oxidation activity of Au/GdPO4-rods

The influence of CePO₄ nanorods on the CO oxidation activity of Au/GdPO₄-rods