The rate expression for a heterogenous 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)

Chemical Reaction Engineering
The rate expression for a heterogenous 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)

E + ΔHA

E + ΔHA - ΔHR

ΔHA + ΔHR

E

E + ΔHA

E + ΔHA - ΔHR

ΔHA + ΔHR

E

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Chemical Reaction Engineering
If the time required for half change is inversely proportional to the square of initial concentration and the velocity depends on the units in which the concentration term is expressed, then the order of reaction is

2

1

0

3

2

1

0

3

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Chemical Reaction Engineering
The heat of reaction

Is independent of the mechanism of reaction

Depends on both pressure and mechanism of reaction

Depends on the pressure only

Depends on the mechanism of reaction only

Is independent of the mechanism of reaction

Depends on both pressure and mechanism of reaction

Depends on the pressure only

Depends on the mechanism of reaction only

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Chemical Reaction Engineering
The knowledge of initial concentration and rate constant is necessary to determine the half life time of a reaction of __________ order.

None of these

First

Second

Zero

None of these

First

Second

Zero

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Chemical Reaction Engineering
The size of plug flow reactor (PFR) for all positive reaction orders and for any given duty, is __________ that of mixed reactor.

Greater than

Unpredictable from the data

Smaller than

Equal to

Greater than

Unpredictable from the data

Smaller than

Equal to

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Chemical Reaction Engineering
A chemical reaction, A → 3B, is conducted in a constant pressure vessel. Starting with pure A, the volume of the reaction mixture increases 3 times in 6 minutes. The fractional conversion is

0.33

1

0.5

Data insufficient, can't be predicted

0.33

1

0.5

Data insufficient, can't be predicted

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Chemical Reaction Engineering

Chemical Reaction Engineering If the time required for half change is inversely proportional to the square of initial concentration and the velocity depends on the units in which the concentration term is expressed, then the order of reaction is

Chemical Reaction Engineering The heat of reaction

Chemical Reaction Engineering The knowledge of initial concentration and rate constant is necessary to determine the half life time of a reaction of __________ order.

Chemical Reaction Engineering The size of plug flow reactor (PFR) for all positive reaction orders and for any given duty, is __________ that of mixed reactor.

Chemical Reaction Engineering A chemical reaction, A → 3B, is conducted in a constant pressure vessel. Starting with pure A, the volume of the reaction mixture increases 3 times in 6 minutes. The fractional conversion is

Chemical Reaction Engineering
If the time required for half change is inversely proportional to the square of initial concentration and the velocity depends on the units in which the concentration term is expressed, then the order of reaction is

Chemical Reaction Engineering
The heat of reaction

Chemical Reaction Engineering
The knowledge of initial concentration and rate constant is necessary to determine the half life time of a reaction of __________ order.

Chemical Reaction Engineering
The size of plug flow reactor (PFR) for all positive reaction orders and for any given duty, is __________ that of mixed reactor.

Chemical Reaction Engineering
A chemical reaction, A → 3B, is conducted in a constant pressure vessel. Starting with pure A, the volume of the reaction mixture increases 3 times in 6 minutes. The fractional conversion is