The rate expression for a heterogeneous catalytic reaction is given by, – rA = K.KA PA(1 + KA.PA + KR.PR), where K is surface reaction rate constant and KA and KR are absorption equilibrium constants of A and R respectively. If KR PR >> (1 + KA PA), the apparent activation energy EA is equal to (given E is the activation energy for the reaction and ΔHR and ΔHA are the activation energies of adsorption of R and A) ?

Related Mcqs:

A second order liquid phase reaction, A → B, is carried out in a mixed flow reactor operated in semi batch mode (no exit stream). The reactant A at concentration CAF is fed to the reactor at a volumetric flow rate of F. The volume of the reacting mixture is V and the density of the liquid mixture is constant. The mass balance for A is_______________________?

A. d(VCA)/dt = -F (CAF – CA) – kCA2V B. d(VCA)/dt = F (CAF – CA) – kCA2V C. d(VCA)/dt = -FCA – kCA2V D. d(VCA)/dt = FCAF – kCA2V...

B.E.T. method of finding out surface area of a catalyst, uses the extension of _________________ isotherm?

A. Langmuir B. Freundlich C. Tempkin D. None of these...

The value of Steric factor ‘P’ in the equation k = PZeE/RT usually ranges from ______________________?

A. 1.0 to 10-8 B. 1.1 to 102 C. 0.1 to 0.9 D. None of these...

The rate of a gas phase reaction is given by K . CA . CB. If the volume of the reaction vessel is reduced to l/4th of its initial volume, then the reaction rate compared to the original rate will be _______________ times?

A. 4 B. 16 C. 8 D. 2...

For an ideal gas mixture undergoing a reversible gaseous phase chemical reaction, the equilibrium constant ?

A. Is independent of pressure B. Increases with pressure C. Decreases with pressure D. Increases /decreases with pressure depending on the stoichiometric co-efficients of the reaction...