Abstract
SiO2, Silicalite-2 and HZSM-11 were selected as the support to elucidate the necessity of long-range ordered zeolitic structure & composition for being a high-efficient zeolite-based PNA. It was found the silicalite zeolitic framework is favorable for the formation of small-sized PdOx with rare NOx adsorption ability but strong NO oxidation ability & very good water-resistant ability. The effective species of Pd2+ for NOx capture can only be formed in Si–Al zeolitic framework. The acidity endowed by Si–Al zeolitic framework also does a favor to the oxidation of NO to NO2 at release stage, however, only in dry condition. This work aims to provide some enlightment for designing a superior Pd/zeolite PNA material—possessing both considerable amount of Pd2+ for NOx storage and certain amount of tiny PdOx for partially oxidizing NO to NO2 for better reduction in the subsequent SCR during the release stage by adjusting the support materials' properties.
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