Brunaur, Emmet and Teller (BET) equation is used to determine the specific surface area of a porous particle but not the pore volume & the porosity of the catalyst bed. Which of the following postulates is not used to derive BET equation?

Chemical Reaction Engineering
Brunaur, Emmet and Teller (BET) equation is used to determine the specific surface area of a porous particle but not the pore volume & the porosity of the catalyst bed. Which of the following postulates is not used to derive BET equation?

Langmuir

The adsorbed layer may be polymolecular in thickness and the heat of adsorption in each layer (except the first one) is involved in each of the evaporation process

None of these

There is no dynamic equilibrium between successive layer

Langmuir

The adsorbed layer may be polymolecular in thickness and the heat of adsorption in each layer (except the first one) is involved in each of the evaporation process

None of these

There is no dynamic equilibrium between successive layer

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Chemical Reaction Engineering
In Langmuir treatment of adsorption,

All the adsorption does not take place by the same mechanism

Whole surface of the catalyst is essentially uniform and the adsorbed molecule has no effect on the rate of adsorption per site

Extent of adsorption is more than one complete monomolecular layer on the surface

Whole surface of the catalyst does not have the same activity for adsorption and there is attraction between the adsorbed molecule

All the adsorption does not take place by the same mechanism

Whole surface of the catalyst is essentially uniform and the adsorbed molecule has no effect on the rate of adsorption per site

Extent of adsorption is more than one complete monomolecular layer on the surface

Whole surface of the catalyst does not have the same activity for adsorption and there is attraction between the adsorbed molecule

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Chemical Reaction Engineering
The time needed to achieve the same fractional conversion for particles of different sizes (d) when chemical reaction controls, is proportional to

D

√d

D2

D1.5

D

√d

D2

D1.5

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Chemical Reaction Engineering
Signal normally used to study non-ideal flow by stimulus response technique is __________ input.

Neither A nor B

Pulse

Both A & B

Step

Neither A nor B

Pulse

Both A & B

Step

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Chemical Reaction Engineering
The reaction rate almost gets doubled for 10°C rise in temperature. This is due to the fact that the

Increased temperature reduces the activation energy

Collision frequency increases

Fraction of molecules having threshold energy increases

Value of threshold energy decreases

Increased temperature reduces the activation energy

Collision frequency increases

Fraction of molecules having threshold energy increases

Value of threshold energy decreases

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Chemical Reaction Engineering
The effectiveness factor for large value of Thiele modulus (L√(K/D1)) of a solid catalysed first order reaction is equal to (where, L = length of the reactor, cm, D1 = diffusion co-efficient, cm²/second)

∞

L√(K/D1)

1/(L√(K/D1))

1

∞

L√(K/D1)

1/(L√(K/D1))

1

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Chemical Reaction Engineering

Chemical Reaction Engineering Brunaur, Emmet and Teller (BET) equation is used to determine the specific surface area of a porous particle but not the pore volume & the porosity of the catalyst bed. Which of the following postulates is not used to derive BET equation?

Chemical Reaction Engineering In Langmuir treatment of adsorption,

Chemical Reaction Engineering The time needed to achieve the same fractional conversion for particles of different sizes (d) when chemical reaction controls, is proportional to

Chemical Reaction Engineering Signal normally used to study non-ideal flow by stimulus response technique is __________ input.

Chemical Reaction Engineering The reaction rate almost gets doubled for 10°C rise in temperature. This is due to the fact that the

Chemical Reaction Engineering The effectiveness factor for large value of Thiele modulus (L√(K/D1)) of a solid catalysed first order reaction is equal to (where, L = length of the reactor, cm, D1 = diffusion co-efficient, cm²/second)

Chemical Reaction Engineering
Brunaur, Emmet and Teller (BET) equation is used to determine the specific surface area of a porous particle but not the pore volume & the porosity of the catalyst bed. Which of the following postulates is not used to derive BET equation?

Chemical Reaction Engineering
In Langmuir treatment of adsorption,

Chemical Reaction Engineering
The time needed to achieve the same fractional conversion for particles of different sizes (d) when chemical reaction controls, is proportional to

Chemical Reaction Engineering
Signal normally used to study non-ideal flow by stimulus response technique is __________ input.

Chemical Reaction Engineering
The reaction rate almost gets doubled for 10°C rise in temperature. This is due to the fact that the

Chemical Reaction Engineering
The effectiveness factor for large value of Thiele modulus (L√(K/D1)) of a solid catalysed first order reaction is equal to (where, L = length of the reactor, cm, D1 = diffusion co-efficient, cm²/second)