Modification of the selectivity of catalytic consecutive reactions by poisoning

✍ Scribed by Thierry J. Pareja; Dan Luss

• Publisher: Elsevier Science
• Year: 1975
• Tongue: English
• Weight: 553 KB
• Volume: 30
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(75)85043-3

✦ Synopsis

The intrinsic selectivity of a heterogeneous catalyst may be modified by addition of poisons when a different number of catalytic sites are occupied by various reacting species. We extend here a model of Herington and Rideal to account for modification of intrinsic selectivity of catalytic first order consecutive reactions. A study of the interactions between the catalytic selectivity, poisoning and diffusional limitations reveals the existence of several interesting and surprising behavioral features. For example, the intrinsic selectivity is predicted to be a monotonic function of B (the fraction of poisoned sites). However, when diffusional resistances exist, the graph of the observed selectivity versus 0 may attain one or more local extremal values,