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Nanoscale insights into Pt-impregnated mixtures of zeolites

Abstract : A series of catalysts prepared by Pt deposition over intimate mixtures of HUSY and HBEA zeolites was investigated for the first time and compared to individual Pt/zeolite solids. The samples were characterized through macroscopic techniques and at the nanoscale by electron microscopy and electron tomography, in order to evaluate both the acid and the hydrogenation functions. Comparable macroscopic properties were observed between Pt-impregnated individuals and zeolite mixtures. In contrast, at the nanoscale, differences were evident. When mixtures of zeolites were impregnated, Pt was not homogeneously distributed over the sample. In fact, Pt was located mainly on the HBEA zeolite rather than on HUSY, as confirmed by TEM-EDS semi-quantification. This selectivity in Pt location was tentatively explained by the higher amount of terminal silanol and EFAL species in the HBEA sample. The preferential Pt location at the nanoscale may open up new possibilities in the design and application of hybrid catalysts.
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Contributor : Françoise Bertrand Connect in order to contact the contributor
Submitted on : Thursday, September 14, 2017 - 3:51:15 PM
Last modification on : Friday, January 24, 2020 - 11:22:06 AM





Pedro S. F. Mendes, Anne-Lise Taleb, Anne-Sophie Gay, Antoine Daudin, Christophe Bouchy, et al.. Nanoscale insights into Pt-impregnated mixtures of zeolites. Journal of Materials Chemistry A, Royal Society of Chemistry, 2017, 5 (32), pp.16822 - 16833. ⟨10.1039/C7TA02534C⟩. ⟨hal-01587693⟩



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