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Dispersion and states of platinum ions in BEA-zeolite pores: effect of the framework basicity

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Pt/Cs-BEA materials prepared by a classical ion-exchange procedure using two Cs-BEA supports with different Cs loadings, and a reference acidic Pt/H-BEA, have been studied to investigate the effect of the framework basicity (evaluated by FT-IR of adsorbed CO2) on the state of platinum species after the initial steps (introduction of Pt complex by ion-exchange and subsequent calcination) of the preparation procedure. DR-UV data revealed that the framework basicity affects the structure of the Pt2+ complexes introduced as countercations in the zeolite by ion exchange. FT-IR spectra of adsorbed CO indicated that zeolite basicity rules the fate of platinum species in the subsequent calcination. Hence, in Pt/H-BEA essentially well dispersed Ptδ+ (4 ≥ δ ≥ 1) are present, while PtOx particles progressively prevail as the basic character of the zeolite increases.

Affiliations: 1: Dipartimento di Chimica IFM & NIS Center of Excellence, Università degli Studi di Torino, via P. Giuria 7, 10125 Torino, Italy; Dipartimento di Scienze e Tecnologia Avanzate and Nano-SiSTeMI Interdisciplinary Centre, Università del Piemonte Orientale "A. Avogadro", via Bellini 25/G, 15100 Alessandria, Italy; 2: Laboratoire de Réactivité de Surface, UMR 7609 du CNRS, Université Pierre et Marie Curie, 4 place Jussieu, casier 178, 75252 Paris cedex 05, France; 3: Dipartimento di Chimica IFM & NIS Center of Excellence, Università degli Studi di Torino, via P. Giuria 7, 10125 Torino, Italy


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