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1967821 
Journal Article 
Resistance to sulfur poisoning of Ir and Ir-Re/gamma-Al2O3 catalysts 
Reyes, P; Fernandez, J; Pecchi, G; Fierro, JLG 
1998 
43 
3 
273-280 
WOS:000076339000005 
Highly dispersed alumina-supported iridium and iridium-rhenium catalysts were prepared to study the effect of the metal loading and the addition of Re on the surface properties and on the resistance to sulfur poisoning of Ir/Al2O3 catalysts using an organometallic precursor, Ir(acac)(2). Particle size in the Ir catalysts was modified using different metal loading ranging from 0.5 to 3.0 Ir wt.%. A bimetallic Ir-Re catalyst, containing 1 wt.%lr and 0.5 wt% Re was also studied, The catalysts were characterized by H-2 chemisorption, temperature programmed reduction, temperature programmed desorption of ammonia and XPS. The catalysts were used in toluene hydrogenation and the thiotolerance level was measured with a feed containing 10 ppm of thiophene. It was found that the sulfur tolerance increases as metal particle size increases and with the addition of Re. 
iridium; hydrogenation; thiotolerance; chemisorption; XPS