Gas A is decomposed at 700 C with a partial

pressure of 1 atm, with a first-order irreversible

reaction, in a constant bed isothermal reactor,

volume 100 cm3. The reactor contains spherical

catalyst granules, 5 mm in diameter, and the bed

porosity is 0.5. The rate of decomposition is 0.25

mol/ sec. The effective diffusion of the reactant

in the catalyst granules is

1.0 x 10-6 m2 sec.

a) Calculate the efficiency factor of the catalyst

b) What should be the size of the grains in order

to eliminate all resistances due to internal

diffusion?

(0.5 points)

c) To develop the equation of the external

isothermal and non-isothermal efficiency factor

for a zero order reaction.

A > B.

d) Develop an equation for the efficiency factor

of a 2L cylindrical pore. Both ends of the pore are

exposed to Cs concentration reagents. An

irreversible first-order reaction (A > B) takes

place on the walls of the pore. The result will be

of the form =f (p) where p is the Thiele

number for an individual resource. The pore

radius is a and the diffusion of A in the pore is D.

The reaction rate constant is ks, in (mol / cm2-

sec) x (mol cm3).

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