Resistance to sulfur poisoning of Ir and Ir-Re/?-Al 2O 3 catalysts

Reyes, P; Fernandez, J; Pecchi G.; Fierro, J.L.G.

Abstract

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/Al 2O 3 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.%Ir 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.

Más información

Título de la Revista: BOLETIN DE LA SOCIEDAD CHILENA DE QUIMICA
Volumen: 43
Número: 3
Editorial: Sociedad Chilena de Química
Fecha de publicación: 1998
Página de inicio: 273
Página final: 280
URL: http://www.scopus.com/inward/record.url?eid=2-s2.0-33750097087&partnerID=q2rCbXpz