Related Questions

BET apparatus is used to determine the
A Specific surface of a porous catalyst
B Pore size distribution
C Pore diameter
D Porosity of the catalyst bed
For the hydrogenation of oils (i) __________ is commonly used as catalyst and (ii) __________ is a catalyst poison.
A (i) platinum (ii) sulphur
B (i) palladium (ii) oxygen
C (i) nickel (ii) sulphur
D (i) nickel (ii) oxygen
A first order reaction A → B occurs in an isothermal porous catalyst pellet of spherical shape. If the concentration of A at the centre of the pellet is much less than at the external surface, the process is limited by
A Diffusion within the pellet
B Reaction
C External mass transfer
D None of the above
Which of the following factors control the deactivation of a porous catalyst pellet?
A Decay reactions
B Pore diffusion
C Form of surface attack by poison
D All of the above
Helium-mercury method can be used to determine the __________ of the catalyst particle.
A Pore volume
B Solid density
C Porosity
D All of the above
BET apparatus
A Measures the catalyst surface area directly
B Operates at very high pressure
C Is made entirely of stainless steel
D None of these
A catalyst is said to be a negative catalyst, ifit
A Retards the rate of reaction
B Reduces the value of equilibrium constant
C Does not initiate the reaction
D All of the above
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
Helium-mercury method is used for the measurement of the __________ of the catalyst.
A Surface area
B Porosity
C Pore volume
D Both B & C
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

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