Copper–cerium oxide catalysts supported on monoclinic zirconia: Structural features and catalytic behavior in preferential oxidation of carbon monoxide in hydrogen excess

Copper–cerium oxide catalysts supported on monoclinic zirconia CuO/CeO2/ZrO2 were tested in the preferential oxidation of CO in hydrogen-rich gases and the optimal catalyst composition was determined. The state and the structure of copper species in the catalysts were investigated by X-ray diffraction (XRD) and X-ray absorption fine structure (XAFS) analysis. While a small amount of copper incorporated into the surface layers of the CeO2 lattice, the disordered oxide clusters were the main copper species in the catalysts with copper content ≤5 wt.%. The increase in the copper loading (>10 wt.%) led to predominant formation of bulk CuO phase coupled with catalyst deactivation.

Graphical abstractCopper–cerium oxide catalysts supported on monoclinic zirconia exhibited a good performance in preferential oxidation of CO in hydrogen-rich gases. The influence of catalyst composition on the state, structure and catalytic activity of copper species was investigated. The high activity was related to a high concentration of the finely dispersed copper (II) oxide clusters and the copper ions strongly interacting with CeO2.Figure optionsDownload full-size imageDownload as PowerPoint slide