ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Influence of synthesis parameters on physicochemical properties of CuO/ZrO₂ catalysts

Michał Śliwa and Katarzyna Samson

Polish Academy of Sciences, Kraków, Poland

E-mail: ncsliwa@cyf-kr.edu.pl

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 (D_Cu) does not depend on calcination. On the other hand, for non-aged catalysts a decrease in D_Cu is observed with higher temperature of calcination. The temperature corresponding to maximum reduction rate (T_max) decreases for samples with higher D_Cu. 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.

DOI: 10.1007/s11696-019-00832-8

Chemical Papers 73 (11) 2793–2802 (2019)