Open AccessCharacterization and Catalytic Behaviour of Co3(PO4)2–AlPO4 Catalysts
Author(s) -
Mohsen M. Mostafa,
F. Sh. Ahmed
Publication year - 1998
Publication title -
adsorption science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.682
H-Index - 36
eISSN - 2048-4038
pISSN - 0263-6174
DOI - 10.1177/026361749801600405
Subject(s) - chemistry , catalysis , coprecipitation , adsorption , dehydration , titration , selectivity , inorganic chemistry , amorphous solid , specific surface area , analytical chemistry (journal) , nuclear chemistry , crystallography , chromatography , organic chemistry , biochemistry
Co 3 (PO 4 ) 2 , AlPO 4 and the binary system Co 3 (PO 4 ) 2 -AlPO 4 with different compositions were prepared by the coprecipitation method. The structural properties of these samples were determined using XRD, DTA and FT-IR techniques. The textural properties were determined from the adsorption of nitrogen at 77 K. The surface acidity was measured by a calorimetric titration method. The samples were tested as catalysts in the dehydration of ethanol and isopropanol using a pulse microcatalytic technique. The data obtained from XRD and FT-IR indicate the amorphous structures of the prepared catalysts. An increase in Co 3 (PO 4 ) 2 content led to a decrease in the surface area and in the total pore volume and an increase in the mean pore radius. The surface acidity of the catalyst depends on the chemical composition; the surface acidity increased with an increase in the AlPO 4 content. The dehydration temperature and the distribution of acid sites are important parameters in determining the selectivity and activity of the catalyst.