Related Questions

Effectiveness factor (E) of a catalyst pellet is defined as, E = (actual rate within pore of catalyst/rate if notsnowed 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 reaction which is catalysed by an acid is also catalysed by any substance, which has a tendency to
A Lose a proton
B Gain a proton
C Lose an electron
D None of these
A reaction which is catalysed by a base is catalysed by all substances which have a tendency to
A Lose a proton
B Gain a proton
C Gain an electron
D None of these
Overall rate of reaction in a heterogenous catalytic reaction depends upon the mass and energy transfer from the fluid to solid surface and its rate of reaction is usually __________ the concentration of catalyst, if it does not entail a chain mechanism.
A Proportional to
B Independent of
C Inversely proportional to
D Proportional to the square of
If pore diffusion is the controlling step in a solid catalysed reaction, the catalyst
A Porosity is very important
B Porosity is of less importance
C Internal surface area is utilised efficiently
D None of these
Kinetics of a solid catalysed reaction can best be studied in a __________ reactor.
A Batch
B Plug-flow
C Mixed
D None of these
For high conversion in a highly exothermic solid catalysed reaction, use a __________ bed reactor.
A Fixed
B Fluidised bed reactor followed by a fixed
C Fixed bed reactor followed by a fluidised
D Fluidised
In solid catalysed reactions the diffusional effects are more likely to affect the overall rate of reaction for
A Fast reactions in catalyst of small pore diameter
B Fast reaction in catalyst of large pore diameter
C Slow reactions in catalyst of small pore diameter
D Slow reactions in catalyst of large pore diameter
When adsorption hysteresis is observed, the desorption equilibrium pressure is __________ that obtained by adsorption.
A Always lower than
B Always higher than
C Same as
D Dependent on the system; can be either lower or higher than
In case of physical adsorption, the heat of adsorption is of the order of __________ kcal/kg.mole.
A 100
B 1000
C 10000
D 100000

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