Open AccessDehydrogenation of Cyclohexane in Relation to Some Textural and Catalytic Properties of Ni/Al2O3 and Co/Al2O3 Catalysts
Author(s) -
Th. El-Nabarawy
Publication year - 1997
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 - 10.1177/026361749701500103
Subject(s) - dehydrogenation , catalysis , cyclohexane , chemistry , hydrogen , adsorption , inorganic chemistry , metal , oxide , dispersion (optics) , differential thermal analysis , diffraction , organic chemistry , physics , optics
Ni/Al 2 O 3 and Co/Al 2 O 3 catalysts of different compositions have been prepared. Their structural properties were determined using X-ray diffraction and differential thermal analysis. The textural properties of these catalysts were determined from nitrogen adsorption at 77 K. The catalysts were reduced with hydrogen at 673 K and the adsorption of hydrogen on the reduced catalysts was measured at 320 K. Dehydrogenation of cyclohexane at flow rates of 10–30 ml/min and at 633–723 K was investigated. The loading of alumina with metal oxides leads to changes in the textural properties depending on the degree of loading and on the loaded metal oxide. The adsorption of hydrogen allowed the determination of important catalytic parameters. Dehydrogenation of cyclohexane on the investigated catalysts followed fraction order kinetics. The dehydrogenation activity has been related to the H 2 uptake and to the extent of metal dispersion on the support.