Performance and S resistance of novel supported PdPt catalysts on Al₂O₃–TiO₂ material in hydrogenation of biphenyl

Authors: Núñez, S.; Montesinos-Castellanos, A.; Zepeda, T. A.; Los Reyes, J. A.

Source: Materials Research Innovations, Volume 12, Number 1, March 2008 , pp. 55-59(5)

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Abstract:

The Al₂O₃–TiO₂ materials were synthesised by sol–gel technique with low and high Ti content (molar ratios of Al/Ti=25 and 2). The samples were used as supports of PdPt catalysts with total loading metals of 1 wt-% (molar ratio of Pd/Pt=4) by incipient wetness impregnation using H₂PtCl₆ and Pd(NO₃)x H₂O. The samples were characterised by absorption–desorption of N₂, X-ray diffraction, transmission electron microscopy and were tested in the hydrogenation (HYD) of biphenyl model reaction. The PdPt catalysts supported on the mixed Al₂O₃–TiO₂ material with low Ti content exhibited a high HYD activity in comparison with the high content Ti sample. It is proposed that the presence of Ti could modify the catalytic behaviour as a result of changes in the electronic properties of the active phase, interacting with such species. Moreover, Ti increased the sulphur resistance of the metallic particles under HYD conditions.

Keywords: SULPHUR RESISTANCE OF PRECIOUS METALS; BIPHENYL HYDROGENATION; PDPT CATALYSTS; HYDROTREATING CATALYSTS; MIXED AL2O3-TIO2 SUPPORT

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/143307508X270785

Publication date: 2008-03-01

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