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Lamellar zirconium phosphates to host metals for catalytic purposes

Abstract

In the present study a porous lamellar zirconium phosphate heterostructure (PPH) formed by zirconium(IV) phosphate expanded with silica galleries (P/Zr molar ratio equal to 2 and (Si+Zr)/P equal to 3) was prepared to host noble metals. Textural and structural characterization of PPH-noble metal materials was carried out in order to elucidate the location, dispersion of the metallic particles and the properties of the resultant material to be used in catalytic processes. In the present paper, their activity in the catalytic hydrodeoxygenation (HDO) reaction of dibenzofuran (DBF) was evaluated. X-ray diffraction (XRD), solid state nuclear magnetic resonance (NMR) and X-ray photoelectron spectroscopy (XPS) evidenced that the structure of the pillared zirconium phosphate material was not modified by the incorporation of Pt and Pd. Moreover, transmission electron microsocopy (TEM) showed a different dispersion of the noble metal. The acidity of the resultant PPH-noble metal materials also changed, although in all cases the acidity was of weak nature, the incorporation of noble metal affected Bronsted acid sites as observed from 31P NMR spectra. In general, textural, structural and acidic properties of the resultant materials suggest that PPH can be considered a good candidate to be used as catalytic support. Thus, the catalytic results of the PPH-noble metal samples indicated that Pd sample reached a stable behavior probably ascribed to a high dispersion of the active phase. Instead, Pt sample suffered from fast deactivation. The selectivity to the reaction products was strongly dependent on the noble metal employed.

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Publication details

The article was received on 03 Oct 2017, accepted on 13 Nov 2017 and first published on 13 Nov 2017


Article type: Paper
DOI: 10.1039/C7DT03717A
Citation: Dalton Trans., 2017, Accepted Manuscript
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    Lamellar zirconium phosphates to host metals for catalytic purposes

    D. Ballesteros-Plata, A. Infantes-Molina, E. Rodríguez-Aguado, P. Braos-García and E. Rodriguez-Castellon, Dalton Trans., 2017, Accepted Manuscript , DOI: 10.1039/C7DT03717A

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