Energetic Classification of Adsorption Isotherms

✍ Scribed by Jürgen Adolphs; Max Josef Setzer

• Book ID: 102577497
• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 159 KB
• Volume: 184
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.1996.0639

✦ Synopsis

with T the absolute temperature and the gas constant R Å The new model describes adsorption isotherms with a two-pa-8.314 J mol 01 K 01 .

rameter function. The parameters are easy and precise to calculate

The complete chemical potential is usually written as from the excess surface work of the adsorbed layer. The excess surface work is defined as the product of adsorbed amount and m Å m*(T ) / Dm, [2b] the change of the chemical potential. The differential form yields a minimum at the first layer. It is possible to linearize the corresponding integral form. The physical meanings of the two paramewith m*(T ) the standard chemical potential at a given temters are the monolayer capacity and the chemical potential, which perature T. is necessary for adsorption. The new model allows an energetic Taking into account that in equilibrium the chemical poclassification of adsorption phenomena of surface films in the enertential of the gaseous phase is equal to that of the adsorbed getic range from weak physisorption to chemical adsorption phase