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Transient studies and kinetic modeling of ethylene oxidation on Pt/SiO 2
Author(s) -
Sant Ravindra,
Kaul David J.,
Wolf Eduardo E.
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.690350211
Subject(s) - ethylene , adsorption , catalysis , chemistry , activation energy , oxygen , reaction rate , kinetic energy , non equilibrium thermodynamics , transient (computer programming) , elementary reaction , thermodynamics , fourier transform infrared spectroscopy , chemical engineering , kinetics , organic chemistry , physics , quantum mechanics , computer science , operating system , engineering
This paper describes a reaction‐reactor model, utilizing alternative reaction pathways, developed to explain experimental results from the total oxidation of ethylene on a Pt/SiO 2 catalyst. Transient temperature‐programmed reaction and concentration‐programmed reaction experiments were utilized to study the reaction through FTIR spectroscopic and surface temperature measurements combined with bulk measurements of concentration and temperature. Different elementarystep pathways were incorporated into the concentration and energy balances in performing the simulations. One pathway utilized adsorbed CO, formed from adsorbed ethylene, as the route to CO 2 formation. This pathway is shown to become important under ethylene‐rich conditions. The second pathway utilized the direct reaction between adsorbed ethylene and adsorbed oxygen as the path to CO 2 formation. The latter route is shown to become important under oxygen‐rich conditions. Finally, an example is utilized to show the advantages of the nonequilibrium elementary‐step modeling approach over conventional “equilibrium” models where only one step is taken to be rate‐determining.