Journal
JOURNAL OF CATALYSIS
Volume 278, Issue 2, Pages 253-265Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2010.12.008
Keywords
Iridium; Amorphous silica-alumina; Bifunctional catalysts; Ring opening; Tetralin; Thiotolerance; Comprehensive two-dimensional gas chromatography
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Funding
- French government
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The hydroconversion of tetralin over iridium nanoparticles supported on amorphous silica-alumina (ASA) has been investigated in a continuous high-pressure gas-phase micro-reactor in the presence of H2S. In order to tune the Ir particle size, the bifunctional Ir/ASA catalysts have been submitted to sintering treatments. The samples have been characterized by HRTEM and XPS. From careful analysis of tetralin conversion products by comprehensive two-dimensional gas chromatography (GCxGC-MS) and NMR, compound families have been unambiguously distinguished. Hydrogenation, dehydrogenation. (saturated and aromatic) ring-contraction products, and (saturated and aromatic) one-ring-opening products are formed, without significant cracking. The catalysts exhibit stable activity in the presence of sulfur. As the mean particle size increases from 1.5 to 8 nm, the ring-opening/contraction selectivity increases dramatically. This effect is related to an increase of the acid/metal site ratio. (C) 2010 Elsevier Inc. All rights reserved.
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