Question

The slope of the curve of ln\((ln\frac{C_A}{C_{A∞}})\) and t for batch solid – fluid independent deactivation system is ___

(a) ln(lnkd)

(b) ln(kd)

(c) kd

(d) -kd

I have been asked this question by my college director while I was bunking the class.

I'd like to ask this question from Mechanisms of Catalyst Deactivation in chapter Suspended Solid Reactors, Catalyst Deactivation, Diffusion and Reaction of Chemical Reaction Engineering

Answer 1

Right answer is (d) -kd

Explanation: ln\((ln\frac{C_A}{C_{A∞}})\) = ln \(\frac{Wk’}{Vk_d}\) – kdt. The slope of the curve is -kd and the intercept is ln\(\frac{Wk’}{Vk_d}. \)