Abstract
The effects of Y addition to Pd/Ce-Zr/Al 2O 3 catalyst have been investigated for the combustion of methane. The supported Pd catalysts are characterized by XPS, TPR, TPO and TPSR techniques in order to study the oxidation/reduction properties. Activity tests in methane combustion show that addition of Y to Pd/Ce-Zr/Al 2O 3 catalyst remarkably promotes its low-temperature and total conversion activity. In addition, the introduction of Y also greatly suppresses deactivation of Pd/Ce-Zr/Al 2O 3 and endows Pd/Ce-Zr-Y/Al 2O 3 with higher thermal stability than Pd/Ce-Zr/Al 2O 3. The characterization results of catalysts indicate that the addition of Y to Pd/Ce-Zr/Al 2O 3 catalyst can effectively inhibit the decomposition of PdO particles and improve the reduction–reoxidation properties of the active PdO species, which increases the catalytic activity and thermal stability of the Pd/Ce-Zr/Al 2O 3 catalyst.
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