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Experimental study of particle to gas heat transfer in fixed‐bed reactors
Author(s) -
Pathangey Balachanderrao,
Kovenklioglu Suphan
Publication year - 1989
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690350111
Subject(s) - exothermic reaction , endothermic process , chemistry , cyclohexane , catalysis , dehydrogenation , thermodynamics , heat transfer , platinum , particle (ecology) , standard enthalpy of reaction , enthalpy , organic chemistry , adsorption , physics , oceanography , geology
Particle to gas heat transfer studies were carried out for the exothermic benzene hydrogenation and endothermic cyclohexane dehydrogenation reactions on the same catalyst bed. A recirculation type reactor and eggshell type commercial platinum on alumina catalyst were used. When the thermodynamic value for the heat of reaction is used for both reactions in the steady‐state energy balance, local J H factors for the exothermic reaction were found to be, in general, higher than those for the endothermic reaction. This was attributed to product molecules leaving the catalyst surface with excess vibrational energy, which implies that the actual heat of reaction would be different than the thermodynamic value used in the J H factor calculations. The study also indicated significant variations in the local J H factors; these were attributed to variations in the linear velocity in the radial direction.