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The effects of internal mass transfer on the hydrogenation of benzene over nickel‐alumina catalyst
Author(s) -
Jiracek Frantisek,
Horak Josef,
Pasek Josef
Publication year - 1969
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.690150319
Subject(s) - catalysis , benzene , mass transfer , nickel , diffusion , chemistry , activation energy , pellet , hydrogen , atmospheric temperature range , reaction rate , atmospheric pressure , porosity , kinetics , chemical engineering , analytical chemistry (journal) , thermodynamics , materials science , composite material , chromatography , organic chemistry , oceanography , quantum mechanics , engineering , geology , physics
The influence of mass transfer on reaction kinetics, within the porous structure of a catalyst, was investigated during the hydrogenation of benzene. The temperature range for a nickel catalyst at atmospheric pressure was 99 to 160°C. The rate equation and the apparent activation energy on a cylindrical catalyst pellet (4.5 mm. in diameter and 5.5 mm. in height) and on the catalyst particles (0.5 to 0.63 mm. in diameter) were evaluated. The effect of internal diffusion on the dependence of the reaction rate, on the temperature, and on the partial pressures of benzene and hydrogen was satisfactorily explained by means of theoretical relations. The values of the effective diffusion coefficient of benzene were compared by calculating the kinetic data and temperature difference in the cylindrical pellet.