In this work, the influence of synthesis conditions onpore structure of Al-PILC was investigated, and then therelationship between the structure of supports and catalyticproperties in benzene oxidation of the catalysts was studied.XRD results show that the basal spacing is greatlyenlarged after Al pillaring and doping with Ce on Al-PILCyielded a super structure. By N2 adsorption technique, it isfound that synthesis conditions of Al-PILC have a significantimpact on the surface area and Vmic, and loss in porevolume and Ames of Al-PILC is observed due to the dopedCe3+. H2-TPR profiles indicate that the peak (<10 C)temperature increases in the following order: Pd/6%Ce/Al-PILC (8; 60; 2.4), Pd/6%Ce/Al-PILC (2; 60; 2.4), Pd/6%Ce/Na-mmt. And hydrogen consumption of thesesamples decreases in the same order. This order is inconformance with catalyst activity. Activity tests showedthat pillaring, optimized synthesis conditions of pillaringsolution and addition of Ce obviously improved the activityof catalysts for the deep oxidation of low concentrationof benzene. Pd/6%Ce/Al-PILC (8; 60; 2.4), in particular,exhibited the highest catalytic activity and the temperaturefor the 90% benzene conversion using this catalyst wasabout 250 C.
การแปล กรุณารอสักครู่..
