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Reaction rate hysteresis in the hydrotreating of thiophene in wide‐ and narrow‐pore catalysts during temperature cycling
Author(s) -
Fatemi Shohreh,
Moosavian Mohammad A.,
Abolhamd Giti,
Mortazavi Yadollah,
Hudgins Robert R.
Publication year - 2002
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450800208
Subject(s) - hydrodesulfurization , catalysis , thiophene , hysteresis , temperature cycling , materials science , mesoporous material , chemical engineering , porosity , thermodynamics , capillary condensation , reaction rate , chemistry , thermal , adsorption , composite material , organic chemistry , quantum mechanics , engineering , physics
The influence of capillary condensation of reagents in porous catalysts for hydrodesulfurization at temperatures below 195°C and at pressures around 0.95 MPa was investigated experimentally and by modelling. The rate of reaction of thiophene in a solution of n ‐heptane was studied in steady and dynamic modes over two Ni‐Mo/γ‐Al 2 O 3 mesoporous catalysts with mean pore diameters differing by 2.6‐fold. Pronounced rate hysteresis was observed under thermal cycling for the narrow‐pore catalyst, but less so for the wide‐pore catalyst. The process was modelled for a mixed‐flow reactor under steady and dynamic conditions by means of the Kelvin equation and introducing two kinetic models for liquid and vapour phase to estimate the concentration of reactant in both phases. The model exhibited good agreement with hysteresis results.