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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. 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 hydrogenating functions. Comparable macroscopic properties were observed between Pt-impregnated individuals and zeolite mixtures. Contrarily, 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 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 HBEA sample. The preferential Pt location at the nanoscale may raise new possibilities in the design and application of hybrid catalysts.

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Publication details

The article was received on 22 Mar 2017, accepted on 13 Jul 2017 and first published on 13 Jul 2017


Article type: Paper
DOI: 10.1039/C7TA02534C
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Nanoscale insights into Pt-impregnated mixtures of zeolites

    P. S.F. Mendes, A. TALEB, A. gay, A. Daudin, C. Bouchy, J. M. Silva and M. F. Ribeiro, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA02534C

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