Sulphur poisoning of nonuniformly impregnated Pt-alumina catalysts

✍ Scribed by Bibiána Remiarová; Alena Brunovská; Massimo Morbidelli

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 750 KB
• Volume: 48
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(93)81004-f

✦ Synopsis

An experimental and theoretical investigation of the deactivation of a single narrow activity region catalyst pellet is presented. As the mode1 system the hydrogenation of ethylene oti the P&alumina catalyst (narrow region of Pt inside the pellet) in the presence of catalyst poison thiophene is considered. The parameters of both deactivation rate expression snd energy balance are estimated. It was found that the deactivation mechanism consists of two consecutive steps, reversible catalyst poison precursor adsorption, and irreversible surface reaction, and is described by a nonseparable rate equation. Both steps are proien experimentally. The possibility of a significant increase of the resistance against deactivation using a narrow activity region is illustrated. Optimal activity distribution is estimated for given values of model parameters.