Insights into CO oxidation on Au/TiO2-HMor zeolite catalysts at low temperature

The effect of combining TiO 2 and mordenite zeolite (HMOR), employed as support of gold nanoparticles, on the CO oxidation reaction at low temperature is studied. The amount of TiO 2 encapsulated into HMOR was varied and the catalyst efficiency was investigated. The deposition-precipitation with urea (DPU) method was used to deposit gold nanoparticles; likewise, the synthesis of monometallic catalysts based on TiO 2 and HMOR is reported. The synthesized materials were characterized by X-ray diffraction (XRD), nitrogen adsorption, X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared spectroscopy (FTIR), and transmission electron microscopy (TEM). The addition of TiO 2 influenced the properties of the TiO 2 -HMOR composite, and its catalytic performance in the CO oxidation from 20°C. It was established that the 5Au/(28)TiO 2 -HMOR composite was the most active catalyst at lower temperatures, which was ascribed to the close contact among the components of the TiO 2 -HMOR composite, gold dispersion, gold and TiO 2 loadings, and Au and Ti species present in the catalysts.