Problem $6$

The following elementary reaction takes place in a CSTR:

$A{?}^{k}B$

The reaction is facilitated by a solid catalyst that is confined within the reactor with the

aid of a mesh. The mesh ensures that the catalyst does not exit the reactor. The

volume of the reaction mixture remains constant throughout the process.

Unfortunately, the catalyst exhibits zeroth order degradation kinetics. The degradation

constant is $k_D.$ Derive an expression for the temporally changing concentration of $A$

within the reactor. Use suitable notations to distinguish your variables.

Describe a real$-$life situation where you might expect to encounter such a system.