Characterization of Pdsingle bondCeO2 interaction on alumina support and hydrogenation of 1,3-butadiene Original Research Article

The influence of the preparation method and loading of CeO2 on the interaction of Pd/CeO2/Al2O3 catalysts was studied. The materials were characterized by temperature-programmed reduction, hydrogen chemisorption and X-ray photoelectron spectroscopy measurements. The 1,3-butadiene hydrogenation was used as a model reaction. The Pdsingle bondCe interaction affected the reduction behavior of the catalysts. Temperature-programmed reduction (TPR) results showed that the presence of CeO2 shifts the reduction temperature of PdO to lower values, while palladium similarly facilitates the reduction of the cerium surface species. The hydrogen uptake decreased when increasing the ceria content. XPS results showed that the Pd/Al ratio decreased with CeO2 addition being affected by the preparation method and content. The formation of catalytic sites at the interface of Pdsingle bondCe was postulated from turnover frequency (TOF) results of the 1,3-butadiene hydrogenation. The number of these new sites increases with the addition of ceria. The nature of these sites is discussed in terms of the influence on the selectivity in butadiene hydrogenation.