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Consider one of the cylindrical channels that run through an isomerization catalyst as shown below. A catalyst coats the inner walls of each channel. This
Consider one of the cylindrical channels that run through
an isomerization catalyst as shown below. A catalyst coats the
inner walls of each channel. This catalyst promotes the isomer
ization of butane species A to isobutene
species
mol & mol
Bulk gas phase
diam
channels
eylindrical pe
Catalytic surfi
g
The gas phase above the channels contains mixture of A and
maintained at a constant composition of mol
A and molB Gas phase species A diffuses
down a straight channel of diameter and length
The base of each channel is sealed. This is rapid
reaction so that the production rate of is diffusion limited
The quiescent gas space in the channel consists of only species
and
a State three relevant assumptions for the mass transfer
process.
b Based on your assumptions, simplify the general differential
equation for the mass transfer of species leaving the
equation in terms of the flux
c Using equations for the flux of in your determined
equation, express the general differential equation in terms
of the concentration
d Specify relevant boundary conditions for the gas phase
concentration
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