A new method for the determination of the monolayer capacity for hydrogen on a metal supported catalyst based on thermodynamic criteria applied to the

✍ Scribed by C. Hubert; A. Frennet

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 896 KB
• Volume: 17
• Category: Article
• ISSN: 0920-5861
• DOI: 10.1016/0920-5861(93)80050-b

✦ Synopsis

The different methods used for the determination of the monolayer capacity from isotherm adsorption measurements have been applied to the H2 adsorption results on the EUROPt-I reference catalyst. These are analysed to show how some of these methods are dependent upon experimental features such as the evacuation rate at the catalyst surface, the size of the catalyst sample.

It is shown that isochore measurements, in contrast to isothermal measurements, allow determination of variations in the isosteric heat of adsorption Qi, over a large coverage range, and up to the monolayer saturation. The variations of Qti with the adsorbed amount allows us to propose a new way of determining the value of the monolayer capacity.

T'he values determined by isothermal measurements are discussed at the light of this new method.