Question

Which of the following is not an assumption of Langmuir model?

(a) Energy of adsorption of gas molecules to the adsorbent site is different at different adsorbing site

(b) Maximum amount of adsorption corresponds to a monolayer

(c) Desorption rate depends on the amount of material adsorbed onto the solid surface

(d) Gas phase molecules are adsorbed on discrete points on the solid surface

The question was asked in a job interview.

Asked question is from Packed Bed Catalytic Reactor topic in chapter Packed Bed Catalytic Reactor, Fluidised Bed and Transport Reactors of Chemical Reaction Engineering

Answer 1

Right answer is (a) Energy of adsorption of gas molecules to the adsorbent site is different at different adsorbing site

To elaborate: The energy of adsorption is same for all the sites on the adsorbent surface. The adsorption of a gas molecule at one site is independent of the adsorption on an adjacent site.