Novel Pd/TiO2‐Al2O3 Catalysts for Methane Total Oxidation at Low Temperature and Their 18O‐Isotope Exchange Behavior

Abstract Pd supported on TiO 2 ‐Al 2 O 3 binary oxides prepared by coprecipitation method has been investigated for the total oxidation of methane. All Pd/TiO 2 ‐Al 2 O 3 catalysts show higher activity than Pd/Al 2 O 3 and Pd/TiO 2 . Among them, Pd/2Ti‐3Al with a Ti/Al ratio of 2 to 3 has a T 90% of 395 °C at a gas hourly mass velocity of 33000 mL/(h·g), which is at least 50 °C lower than that of Pd supported on single metal oxide Al 2 O 3 or TiO 2 . The results of TPR and 18 O‐isotope exchange experiments demonstrated that the excellent activity of Pd/2Ti‐3Al was due to its high oxygen mobility and moderate reducibility, which is in accordance with our previous work. XPS results indicated that the dispersion of Pd was not the key factor to influence the catalytic activity.