Comparative Study of Ceria Supported Nano-sized Platinum Catalysts Synthesized by Extractive-Pyrolytic Method for Low-Temperature WGS Reaction

In this paper we demonstrate a way to prepare Pt/CeO 2 catalysts and test their catalytic activity in WGSR. The catalysts have been synthesized by a simple and low cost extractive-pyrolytic method. The temperature programmed reduction analysis revealed that the presence of platinum particles enhances the reduction degree of ceria. The morphology of the surface, the particle size and specific surface area were determined by TEM, XRD and BET analysis. EPR studies gave evidence of metal–support interaction, which increases the mobility of oxygen anions in crystal lattice. The effects of various operating parameters including the catalyst bed temperature, space velocity and feed H 2 O/CO ratio were also investigated. Subjecting the samples to pretreatment with H 2 or air had no strong effect on the catalytic activity. By varying the Pt loading, it was also found out that the maximum catalytic activity was achieved with the sample containing 1.2 wt% Pt, reaching up to 98 % CO conversion degree. Graphical Abstract