Preparation, characterization and catalytic behavior of SnO2 supported Au catalysts for low-temperature CO oxidation

SnO2 nanocrystals were synthesized by a precipitation process and then used as the support for Au/SnO2 catalysts preparation via a deposition–precipitation method. The samples were characterized by means of X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM)/energy-dispersive X-ray spectra (EDS) and X-ray photoelectron spectroscopy (XPS). The influence of calcination temperature of SnO2 support, calcination temperature of Au/SnO2 catalysts and Au loading on the catalytic activity of Au/SnO2 catalysts was investigated. The SnO2 samples calcined at 573 and 673 K were found to be the suitable support materials for Au/SnO2 catalysts. In all investigated Au/SnO2 catalysts with different Au loading from 0.36 to 5.00 wt.%, the catalytic activity of the catalyst with 2.86 wt.% Au loading was the highest. The optimum calcination temperature of the Au/SnO2 catalysts was 473 K. According to XRD, HRTEM and XPS, the catalytic activity of the Au/SnO2 catalysts was related to the particle size of gold and tin oxide support, the fraction of metallic state Au and the degree of crystallinity of tin dioxide support.

SnO2 nano-crystals were synthesized by a precipitation process and then used as the support for Au/SnO2 catalysts preparation via a deposition–precipitation method. The influence of calcination temperature of SnO2 support, calcination temperature of Au/SnO2 catalysts and Au loading on the catalytic activity of Au/SnO2 catalysts was investigated. The SnO2 samples calcined at 573 and 673 K were found to be the suitable support materials for Au/SnO2 catalysts. In all investigated Au/SnO2 catalysts, the catalytic activity of the catalyst with 2.86 wt.% Au loading was the highest. The optimum calcination temperature of the Au/SnO2 catalysts was 473 K. According to XRD, HRTEM and XPS, the catalytic activity of the Au/SnO2 catalysts was related to the particle size of gold and tin oxide support, the fraction of metallic state Au and the degree of crystallinity of tin dioxide support. Figure optionsDownload as PowerPoint slide