A. Deposited
B. Chemisorbed
C. Selectivity
D. Stability
Related Mcqs:
- ______________ catalytic reaction is involved in the thermal cracking of gas oil ?
A. Homogeneous
B. Non-Homogeneous
C. Heterogeneous
D. Non-Heterogeneous - Effectiveness factor E. of a catalyst pellet is defined as, E = (actual rate within pore of the catalyst)/(rate if not snowed by pore diffusion), Effectiveness factor for a first order reaction is given by (where, T = Thiele modulus) ___________________?
A. tan hT/T
B. tan T/T
C. tan hT/tan T
D. None of these - A catalyst is said to be a negative catalyst, if it ___________________?
A. Retards the rate of reaction
B. Reduces the value of equilibrium constant
C. Does not initiate the reaction
D. All A., B. and C. - A spherical porous catalyst particle of radius R is subjected to reactant A which reacts to form B by a zero order surface reaction A → B. Film mass transfer resistance is negligible and pore diffusion of A is rate controlling. The effectiveness factor of the catalyst is reported as 7/8. Which of the following statement is true?
A. Inner catalyst core of radius R/8 does not participate in reaction
B. Inner catalyst core of radius R/2 does not participate in reaction
C. Inner catalyst core of radius 7R/8 does not participate in reaction
D. Effectiveness factor for a zero order reaction cannot be 7/8 as it must always be 1 - For the non-catalytic reaction of particles with surrounding fluid, the time needed to achieve the same fractional conversion for particles of different but unchanging sizes is proportional to the square of particle diameter, when the _______________ is the controlling resistance?
A. Film diffusion
B. Diffusion through ash layer
C. Chemical reaction
D. Either A., B. or C. - For the non catalytic reaction of particles with surrounding fluid, the same needed to achieve the same fractional conversion for particles of different unchanging sizes is proportional to the particle diameter, when the ________________ is the controlling resistance?
A. Film diffusion
B. Diffusion through ash layer
C. Chemical reaction
D. Either A., B. or C. - Oil is hydrogenated using nickel catalyst in a __________________ reactor?
A. Batch
B. Slurry
C. Fluidised bed
D. Fixed bed - _____________ gas is normally employed in B.E.T. method of finding out the surface area of catalyst?
A. N2
B. H2
C. CO2
D. He - In the fluid catalytic cracker (FCC), the cracking reaction is _____________ (i) and the regeneration is _______________ (ii) _______________?
A. (i) exothermic (ii) endothermic
B. (i) exothermic (ii) exothermic
C. (i) endothermic (ii) endothermic
D. (i) endothermic (ii) exothermic - The following gas phase reaction is taking place in a plug flow reactor. A stoichiometric mixture of A and B at 300 K is fed to the reactor. At 1 m along the length of the reactor, the temperature is 360 K. The pressure drop is negligible and an ideal gas behaviour can be assumed. Identify the correct expression relating the concentration of A at the inlet (CA0), concentration of A at 1m (CA) and the corresponding conversion of A (X) ?
A. CA = 1.2 CA0 (1 – X)/(1 – 0.33X)
B. CA = 1.2 CA0 (1 – X)/(1 – 0.5X)
C. CA = 0.83 CA0 (1 – X)/(1 – 0.33X)
D. CA = 0.83 CA0 (1 – X)/(1 – 0.5X)
