Reduction behavior of PdO-NiO/SiO2: how Pd location affects cinnamaldehyde hydrogenation

Rim C J van de Poll; Heiner Friedrich; Emiel J M Hensen

doi:10.1039/d4cy01190b

Reduction behavior of PdO-NiO/SiO₂: how Pd location affects cinnamaldehyde hydrogenation

Catal Sci Technol. 2024 Dec 17. doi: 10.1039/d4cy01190b. Online ahead of print.

Authors

Rim C J van de Poll¹, Heiner Friedrich², Emiel J M Hensen¹

Affiliations

¹ Laboratory of Inorganic Materials and Catalysis, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology Eindhoven The Netherlands [email protected].
² Laboratory of Physical Chemistry and Center for Multiscale Electron Microscopy, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology Eindhoven The Netherlands.

Abstract

In this work, we study the reducibility of a PdO precursor placed by strong electrostatic adsorption on either NiO or SiO₂ of NiO/SiO₂ obtained by incipient wetness impregnation. The catalysts were characterized by HAADF-STEM, quasi-in situ XPS, CO IR spectroscopy and H₂ chemisorption as a function of the reduction temperature and evaluated for their performance in cinnamaldehyde hydrogenation. PdO on SiO₂ requires reduction at higher temperatures to achieve appreciable rates of cinnamaldehyde hydrogenation. Pd placed on NiO particles dispersed on the SiO₂ support can already be reduced at room temperature and show a higher activity in cinnamaldehyde hydrogenation, which is argued to be due to the higher Pd dispersion obtained at low reduction temperatures.