Effectiveness factors for the general non-isothermal case of bimolecular Langmuir-Hinshelwood kinetics

✍ Scribed by Samuel H. Wong; Stephen Szépe

• Publisher: Elsevier Science
• Year: 1982
• Tongue: English
• Weight: 457 KB
• Volume: 37
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(82)80032-8

✦ Synopsis

Non-isothermal catalyst effectiveness factors are determined for both exothermic and endothermic reactions with rate equations of the form r, = /&,,/(I + K,,CJ'. It is shown that with such rate equations, multiplicities may occur even for endothermic reactions. In addition, multiple states may arise in regions where the effectiveness factor is less than one.

Regions of unique and multiple steady states of bimolecular Langmuir-Hinshelwood kinetics have also been defined. Contrary to previous findings for exothermic and/or isothermal reactions, multiplicities in endothermic reactions are likely to occur in systems showing higher reaction temperatures and stronger surface chemisorption characteristics. Criteria (developed by previous investigators) sufficient for uniqueness and multiplicity of catalyst particle steady state are compared and discussed.