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Issue 3, 2011
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Thiotolerant Ir/SiO2–Al2O3 bifunctional catalysts: effect of support acidity on tetralin hydroconversion

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Abstract

Tetralin hydroconversion over supported iridium catalysts has been investigated under a pressure of 4 MPa in the presence of H2S in a continuous high-pressure gas-phase microreactor. Decalin, naphthalene, ring-contraction bicyclic products and one-ring-opening products are formed. A screening of silica, alumina and amorphous silicaalumina (ASA) supports demonstrates that only ASA provides thiotolerance and ring opening/contraction selectivity to iridium nanoparticles. By testing Ir/ASA catalysts with various silicaalumina ratios but similar Ir particle size (1.5 nm), it is shown that the intermediate concentration of silica (40 wt%) leads to the highest activity and selectivity, in correlation to the Brönsted acidity measured by infrared spectroscopy of adsorbed pyridine.

Graphical abstract: Thiotolerant Ir/SiO2–Al2O3 bifunctional catalysts: effect of support acidity on tetralin hydroconversion

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Publication details

The article was received on 02 Jan 2011, accepted on 31 Jan 2011 and first published on 21 Feb 2011


Article type: Paper
DOI: 10.1039/C1CY00002K
Catal. Sci. Technol., 2011,1, 408-412

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    Thiotolerant Ir/SiO2–Al2O3 bifunctional catalysts: effect of support acidity on tetralin hydroconversion

    S. Nassreddine, S. Casu, J. L. Zotin, C. Geantet and L. Piccolo, Catal. Sci. Technol., 2011, 1, 408
    DOI: 10.1039/C1CY00002K

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