In a catalytic reactor, cylindrical particles of 1 cm in length and radius = 0.3 cm, are surrounded by a gaseous layer, of thickness 0.2 cm, through which the feed of a mixture A and B, containing 50% of A diffuses and reacts at the surface.

The reaction proceeds according to the simplified equation:

A(g) B(g)

The rate of reaction at the surface with respect to the A(g) component is described by: NA = -K,CA

The system is at 300C and 1 atm, where K1 = 2.0 cm/s and DA-gas mixture => DAM = 0.108 cm/s.

Reminder!!! if it's necessary.

Taylor series,

Considering only the first and second terms of the Taylor series, we have:

Ln (a+x) =

X Ln (a) +.

(12)

It is asked:

a) The diffusion rate (WA) in mol/s

02) What considerations differ the approach of the heterogeneous system in relation to the heterogeneous system? 03) Still in relation to problem 01:

a) if it were limited by mass transport, how could we minimize this resistance?

b) If limited by chemical kinetics, how could we minimize this resistance?