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The effect of pure and high silica Hβ zeolites on the catalytic performance of toluene combustion over Pd/Hβ catalyst was evaluated.Pure and high silica β zeolites were prepared by direct synthesis procedures,then 0.1 wt% of palladium was impregnated on different Hβ zeolites via in-cipient wetness technique using palladium nitrate as the Pd source.The Pd/Hβ catalysts were characterized by XRD,N2 adsorption/desorption,H2O adsorption,NH3-TPD,H2-TPR and XPS techniques.With increasing the SiO2/Al2O3 ratio of β zeolite,the activity of the Pd/Hβ catalysts for toluene combustion increased clearly and the pure silica β zeolite supported Pd catalyst showed the best catalytic activity.The superior catalytic performance of Pd/β catalyst prepared from pure silica β zeolite was attributed to its high hydrophobicity and the preserving ability for PdO active species.
The effect of pure and high silica Hβ zeolites on the catalytic performance of toluene combustion over Pd / Hβ catalyst was evaluated. Pure and high silica β zeolites were prepared by direct synthesis procedures, then 0.1 wt% of palladium was impregnated on different Hβ zeolites in-cipient wetness technique using palladium nitrate as the Pd source. Pd / Hβ catalysts were characterized by XRD, N2 adsorption / desorption, H2O adsorption, NH3-TPD, H2-TPR and XPS techniques. β zeolite, the activity of the Pd / Hβ catalysts for toluene combustion increased clearly and pure silica β zeolite supported Pd catalyst showed the best catalytic activity. The superior catalytic performance of Pd / β catalyst prepared from pure silica β zeolite was attributed to its high hydrophobicity and the preserving ability for PdO active species.