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The activity of a catalyst pellet is defined as the ratio of ___

(a) Rate of adsorption of reactants to the catalyst surface to the rate at which the catalytic pellet converts the reactant

(b) Rate at which the catalytic pellet converts the reactant to the rate of adsorption of reactants to the catalyst surface

(c) Rate at which the catalytic pellet converts the reactant to the rate of reaction with a fresh pellet

(d) The rate of reaction with a fresh pellet to the rate at which the catalytic pellet converts the reactant

This question was addressed to me by my college professor while I was bunking the class.

My question is based upon Mechanisms of Catalyst Deactivation topic in portion Suspended Solid Reactors, Catalyst Deactivation, Diffusion and Reaction of Chemical Reaction Engineering

If the rate of deactivation is given by –\(\frac{da}{dt}\) = 0.0064 day^-1, the expression relating activity and time is ___

(a) a = 0.0064t

(b) a = 1-0.0064t

(c) a = t

(d) a = 0.0064-t

The question was posed to me at a job interview.

My question is based upon Mechanisms of Catalyst Deactivation topic in division Suspended Solid Reactors, Catalyst Deactivation, Diffusion and Reaction of Chemical Reaction Engineering

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

The catalyst deactivation caused by deposition on surface and pores of catalyst is called ____

(a) Adsorption

(b) Regeneration

(c) Fouling

(d) Desorption

I had been asked this question by my school teacher while I was bunking the class.

My question is taken from Mechanisms of Catalyst Deactivation topic in division Suspended Solid Reactors, Catalyst Deactivation, Diffusion and Reaction of Chemical Reaction Engineering

The rate expression for independent deactivation for batch solids is ____

(a) ln\((ln\frac{C_A}{C_{A∞}})\) = ln \(\frac{Wk’}{Vk_d}\) – kdt

(b) ln \(\frac{C_A}{C_{A∞}}\)= ln \(\frac{Wk’}{Vk_d}\) – kdt

(c) lnln \(\frac{C_A}{C_{A∞}}\)= ln \(\frac{Wk’}{Vk_d}\)

(d) lnln \(\frac{C_A}{C_{A∞}}\)=\(\frac{Wk’}{Vk_d}\) – kdt

I had been asked this question during an online interview.

This interesting question is from Mechanisms of Catalyst Deactivation in section Suspended Solid Reactors, Catalyst Deactivation, Diffusion and Reaction of Chemical Reaction Engineering

State true or false.

In parallel deactivation, the reactant produces a side product which deposits on the catalytic surface and deactivates it.

(a) In parallel deactivation, the reactant produces a side product which deposits on the catalytic surface and deactivates it.

(b) True

(c) False

This question was addressed to me in homework.

Asked question is from Mechanisms of Catalyst Deactivation topic in portion Suspended Solid Reactors, Catalyst Deactivation, Diffusion and Reaction of Chemical Reaction Engineering

Which of the following reactor arrangements causes fast deactivation?

(a) Mixed flow for fluid

(b) Plug flow for fluid

(c) Fluidised bed reactor

(d) Batch for fluid and solid

I have been asked this question by my school teacher while I was bunking the class.

The query is from Mechanisms of Catalyst Deactivation topic in chapter Suspended Solid Reactors, Catalyst Deactivation, Diffusion and Reaction of Chemical Reaction Engineering

The activity of a catalyst at a time t = 0 is ____

(a) Negative

(b) Zero

(c) Unity

(d) ∞

This question was addressed to me by my college director while I was bunking the class.

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

Which of the following represents series type deactivation model? (Where R is the product and P is the poison)

(a) A → R → P↓

(b) A → P↓

(c) A→R + P↓

(d) A → R, A → P

I had been asked this question during an interview.

My question is from Mechanisms of Catalyst Deactivation topic in chapter Suspended Solid Reactors, Catalyst Deactivation, Diffusion and Reaction of Chemical Reaction Engineering

Reaction corresponding to stoichiometric equation is called __________

(a) Non-elementary

(b) Elementary

(c) Heterogeneous

(d) Homogeneous

I have been asked this question in a job interview.

I want to ask this question from Reaction Order and Elementary Rate Law topic in portion Rate Laws and Stoichiometry of Chemical Reaction Engineering

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