The kinetic
s of ethylene epoxidation network were
studied experimentally over a ce
sium-doped
silver cataly
st
supported on
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2O
3 pellet
s in a differential reactor. A variety of rate function
swere con
sidered and among the
se, expre
ssion
s ba
sed on a dual-
site Langmuir-Hin
selwoodmechani
sm:
ri =
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PE)
2, fitted the data be
st with an average error of 13.0 and10.7% for the epoxidation and the complete combu
stion reaction
s, re
spectively. Under theexperimental condition
s, both reactant
s influence both reaction rate
s; however, product influencei
s negligible becau
se of their
small partial pre
ssure
s pre
sent in the reactor. High oxygen/ethyleneratio
s and lower temperature favored
selectivity to the epoxidation reaction. The kineticparameter
s obtained from the differential reactor experiment
s were refined to match the fi
xed-bed reactor experiment
s. With thi
s, the average error in predicting both ethylene conver
sionand
selectivity to ethylene oxide wa
s 4.3%. The apparent activation energie
s for the epoxidationand combu
stion reaction
s were 60.7 and 73.2 kJ/mol, re
spectively.