ISSN print edition: 0366-6352
ISSN electronic edition: 1336-9075
Registr. No.: MK SR 9/7
Influence of synthesis parameters on physicochemical properties of CuO/ZrO2 catalysts
Michał Śliwa and Katarzyna Samson
Polish Academy of Sciences, Kraków, Poland
Abstract: CuO/ZrO2 (Cu/Zr) catalysts were synthesized via the co-precipitation method using Na2CO3 as the precipitating agent. The influence of CuO/ZrO2 ratio, aging time and calcination temperature of catalyst precursors on the physicochemical properties of Cu/Zr catalysts was studied. The catalysts were characterized by means of N2 adsorption, temperature-programmed reduction, N2O dissociative chemisorption, X-ray diffraction, inductively coupled plasma optical emission spectrometer and CO2 temperature-programmed desorption. It was found that only for samples calcined at 550 °C the ZrO2 was present as the tetragonal phase (t-ZrO2). In the case for samples which were aged for 1 h, metallic copper dispersion (DCu) does not depend on calcination. On the other hand, for non-aged catalysts a decrease in DCu is observed with higher temperature of calcination. The temperature corresponding to maximum reduction rate (Tmax) decreases for samples with higher DCu. The contribution of weak basic site is the highest for catalysts which were aged, whereas for non-aged catalysts mainly medium basic sites dominate on the surface.
Keywords: CuO/ZrO2 catalysts ; Tetragonal ZrO2 ; Metallic copper dispersion
Full paper is available at www.springerlink.com.
Chemical Papers 73 (11) 2793–2802 (2019)