Catalyst particle effectiveness with unsymmetrical boundary conditions

✍ Scribed by C.S. Tan; J.M. Smith

• Publisher: Elsevier Science
• Year: 1980
• Tongue: English
• Weight: 807 KB
• Volume: 35
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(80)80053-4

✦ Synopsis

In trickle-bed reactors part of the surface of the catalyst particles may be covered by hquld and part by gas Under such condltlons conventional expressions for effectiveness factors are not apphcable because the surface concentration IS not umform In this paper more general equations for both particle and overall effectiveness factors are derived The first development IS for slab geometry where the two plane surfaces of equal areas have different reactant concentrations This 1s followed by treatment of a cubic particle where one or more faces are covered by hquld Approximate methods are then presented for evaluating the effectiveness factor for any fractIona hqmd coverage,f Comparison of the results at permlsslble values off mdlcates that a simple welghtmg-factor method gives good results The method IS Illustrated by comparing predicted and experImental reactlon rates for a case where experlmental results are available-the hydrogenation of m-methyl styrene