γ-Zirconium and γ-Titanium Phosphates Platinum Intercalation Compound: Preparation, characterization and thermal behaviour

Author: Ferragina C.   Cafarelli P.  

Publisher: Springer Publishing Company

ISSN: 1388-6150

Source: Journal of Thermal Analysis and Calorimetry, Vol.53, Iss.1, 1998-07, pp. : 189-206

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Abstract

Inorganic ion-exchangers with a layered structure such as γ-zirconium and γ-titanium phosphates, intercalated with organic diamines, are able to exchange Pt2+ ions to give new intercalation compounds that can be utilized in heterogeneous catalysis. The experiments performed at different temperatures (25 and 45°C), show different ion uptakes, greater at 45°C and for the materials derived from γ-zirconium phosphate. After platinum exchange, all the materials show an amorphization in the XRD if compared with their precursors. The thermal behaviour of the platinum materials is specific, depending on the exchanger used and the ligand inside the exchanger. Pt2+ ion has a catalytic effect on ligand elimination in the γ-zirconium phosphate platinum compounds, but not in those derived from γ-titanium. All the obtained yellow materials show a small step in the TG curves and simultaneously we have the Pt2+→Pt0 reduction: this is confirmed by XRD registered at the temperatures of the thermal effect, showing peaks at dhkl=2.27 and 1.95 Å.

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