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Isotherms of chemical adsorption of bases on solid catalysts for acidity measurement
Author(s) -
Aguayo Andrés T.,
Gayubo Ana G.,
Ereña Javier,
Olazar Martín,
Arandes José M.,
Bilbao Javier
Publication year - 1994
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.280600205
Subject(s) - adsorption , chemistry , butylamine , catalysis , isothermal process , zeolite , ammonia , pyridine , inorganic chemistry , base (topology) , diffusion , thermodynamics , organic chemistry , amine gas treating , mathematical analysis , physics , mathematics
The measurement of the adsorption equilibrium constants of the bases and the total mass of base adsorbed at 200°C are proposed as reproducible indices of average acidity strength and of total acidity of the solid, respectively. The adsorption of different bases (ammonia, n ‐butylamine, tert ‐butylamine, pyridine) in gas phase on solid acidic catalysts (silica–alumina and zeolite catalysts and a silica gel) has been studied, by applying the calorimetric method in flow regime through an isothermal bed of solid. Both the conditions under which the adsorption is exclusively chemical as well as those under which the adsorption is not limited by the internal diffusion of the base have been determined. For these acidity measurements tert ‐butylamine behaves well and is an alternative base to ammonia.