Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2017 Winter 7th Sem Old 173601 Basics Of Catalysis Previous Question Paper
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER?VII(OLD) ? EXAMINATION ? WINTER 2017
Subject Code: 173601 Date:10/11/2017
Subject Name: Basics of Catalysis
Time:10.30 AM TO 01.00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
1 (a) What are the differential and integral analysis for kinetic data? Which one is more
accurate?
07
(b) Classify the catalyst based on the reactions, explain any two in detail. 07
2 (a) Derive an expression for concentration and time for a first order homogeneous
catalytic reaction with respect to A by an integral method. The equation is in the form
as:
?? ?? 1
? ??
?? + ?? ?? 2
? ?? + ??
07
(b) Show that the decomposition of N2O5 at 340 K is a first order reaction. Calculate the
value of the rate constant.
Time (min) 0 1 2 3 4
CN2O5 , mol/l 0.16 0.113 0.08 0.056 0.04
07
OR
(b) How the deactivation of a catalyst takes place? How it is prevented and regenerated? 07
3 (a) How the deactivation of a catalyst takes place by sintering? Derive the expression for
the catalyst decay due to sintering.
07
(b) Reactant A is adsorbed on the surface of a catalyst and reacts with another component
B in the gas phase. The products of the reaction are: C adsorbed on the surface and D
in the gas phase. The product C is then desorbed from the surface. The proposed
mechanism is
Adsorption: ?? ( ?? ) + ?? ? ?? . ??
Surface reaction: ?? ( ?? ) + ?? . ?? ? ?? . ?? + ?? ( ?? )
?? ?? = ?? ?? ( ?? ?? ?? ?? . ?? ?
?? ?? . ?? ?? ?? ?? ?? )
Desorption: ?? . ?? ? ?? ( ?? ) + ??
?? ?? = ?? ?? ( ?? ?? . ?? ?
?? ?? ?? ?? ?? ?
?? )
07
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER?VII(OLD) ? EXAMINATION ? WINTER 2017
Subject Code: 173601 Date:10/11/2017
Subject Name: Basics of Catalysis
Time:10.30 AM TO 01.00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
1 (a) What are the differential and integral analysis for kinetic data? Which one is more
accurate?
07
(b) Classify the catalyst based on the reactions, explain any two in detail. 07
2 (a) Derive an expression for concentration and time for a first order homogeneous
catalytic reaction with respect to A by an integral method. The equation is in the form
as:
?? ?? 1
? ??
?? + ?? ?? 2
? ?? + ??
07
(b) Show that the decomposition of N2O5 at 340 K is a first order reaction. Calculate the
value of the rate constant.
Time (min) 0 1 2 3 4
CN2O5 , mol/l 0.16 0.113 0.08 0.056 0.04
07
OR
(b) How the deactivation of a catalyst takes place? How it is prevented and regenerated? 07
3 (a) How the deactivation of a catalyst takes place by sintering? Derive the expression for
the catalyst decay due to sintering.
07
(b) Reactant A is adsorbed on the surface of a catalyst and reacts with another component
B in the gas phase. The products of the reaction are: C adsorbed on the surface and D
in the gas phase. The product C is then desorbed from the surface. The proposed
mechanism is
Adsorption: ?? ( ?? ) + ?? ? ?? . ??
Surface reaction: ?? ( ?? ) + ?? . ?? ? ?? . ?? + ?? ( ?? )
?? ?? = ?? ?? ( ?? ?? ?? ?? . ?? ?
?? ?? . ?? ?? ?? ?? ?? )
Desorption: ?? . ?? ? ?? ( ?? ) + ??
?? ?? = ?? ?? ( ?? ?? . ?? ?
?? ?? ?? ?? ?? ?
?? )
07
For surface reaction control, show that
? ?? ?? ?
= ?? ?? =
?? ?? ?? ?? ?? ?? ( ?? ?? ?? ?? ? ?? ?? ?? ?? /?? ?? )
1 + ?? ?? ?? ?? + ?? ?? / ?? ?? ?
OR
3 (a) How the deactivation of a catalyst takes place by poisoning? Derive the expression for
catalyst decay due to poisoning.
07
(b) Toluene is adsorbed on the surface of a catalyst and reacts with hydrogen in the gas
phase to produce benzene adsorbed on the surface and methane in gas phase. Benzene
is then desorbed from the surface. The proposed mechanism is:
Adsorption: ?? ( ?? ) + ?? ? ?? . ??
?? ????
= ?? ?? ( ?? ?? ?? ?? ?
?? ?? . ?? ?? ?? )
Surface reaction: ?? 2
( ?? ) + ?? . ?? ? ?? . ?? + ?? ( ?? )
?? ?? = ?? ?? ( ?? ?? 2
?? ?? . ?? ?
?? ?? . ?? ?? ?? ?? ?? )
Desorption: ?? . ?? ? ?? ( ?? ) + ??
?? ?? = ?? ?? ( ?? ?? . ?? ?
?? ?? ?? ?? ?? ?
?? )
When surface reaction controls show that
? ?? ?? ?
= ?? ?? =
?? ?? ?? ?? ?? ?? ( ?? ?? 2
?? ?? ? ?? ?? ?? ?? / ?? ?? )
1 + ?? ?? ?? ?? + ?? ?? /?? ?? ?
07
4 (a) Derive a performance equation for a catalytic batch reactor containing a batch of gas. 07
(b) What is temperature time trajectory for a catalytic reaction?
07
OR
4 (a) Derive an expression of concentration at the surface and at any time for the pore
diffusion resistance combined with surface kinetics for a cylindrical particle. Consider
the reaction is of first order.
07
(b) Derive a performance equation for a catalytic plug flow reactor for a first order
reaction.
07
5 (a) Write the expression for the different catalyst particle shapes effectiveness factor. Also
make a graph between effectiveness factor and the Thiele modulus for different
particle shapes.
07
FirstRanker.com - FirstRanker's Choice
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER?VII(OLD) ? EXAMINATION ? WINTER 2017
Subject Code: 173601 Date:10/11/2017
Subject Name: Basics of Catalysis
Time:10.30 AM TO 01.00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
1 (a) What are the differential and integral analysis for kinetic data? Which one is more
accurate?
07
(b) Classify the catalyst based on the reactions, explain any two in detail. 07
2 (a) Derive an expression for concentration and time for a first order homogeneous
catalytic reaction with respect to A by an integral method. The equation is in the form
as:
?? ?? 1
? ??
?? + ?? ?? 2
? ?? + ??
07
(b) Show that the decomposition of N2O5 at 340 K is a first order reaction. Calculate the
value of the rate constant.
Time (min) 0 1 2 3 4
CN2O5 , mol/l 0.16 0.113 0.08 0.056 0.04
07
OR
(b) How the deactivation of a catalyst takes place? How it is prevented and regenerated? 07
3 (a) How the deactivation of a catalyst takes place by sintering? Derive the expression for
the catalyst decay due to sintering.
07
(b) Reactant A is adsorbed on the surface of a catalyst and reacts with another component
B in the gas phase. The products of the reaction are: C adsorbed on the surface and D
in the gas phase. The product C is then desorbed from the surface. The proposed
mechanism is
Adsorption: ?? ( ?? ) + ?? ? ?? . ??
Surface reaction: ?? ( ?? ) + ?? . ?? ? ?? . ?? + ?? ( ?? )
?? ?? = ?? ?? ( ?? ?? ?? ?? . ?? ?
?? ?? . ?? ?? ?? ?? ?? )
Desorption: ?? . ?? ? ?? ( ?? ) + ??
?? ?? = ?? ?? ( ?? ?? . ?? ?
?? ?? ?? ?? ?? ?
?? )
07
For surface reaction control, show that
? ?? ?? ?
= ?? ?? =
?? ?? ?? ?? ?? ?? ( ?? ?? ?? ?? ? ?? ?? ?? ?? /?? ?? )
1 + ?? ?? ?? ?? + ?? ?? / ?? ?? ?
OR
3 (a) How the deactivation of a catalyst takes place by poisoning? Derive the expression for
catalyst decay due to poisoning.
07
(b) Toluene is adsorbed on the surface of a catalyst and reacts with hydrogen in the gas
phase to produce benzene adsorbed on the surface and methane in gas phase. Benzene
is then desorbed from the surface. The proposed mechanism is:
Adsorption: ?? ( ?? ) + ?? ? ?? . ??
?? ????
= ?? ?? ( ?? ?? ?? ?? ?
?? ?? . ?? ?? ?? )
Surface reaction: ?? 2
( ?? ) + ?? . ?? ? ?? . ?? + ?? ( ?? )
?? ?? = ?? ?? ( ?? ?? 2
?? ?? . ?? ?
?? ?? . ?? ?? ?? ?? ?? )
Desorption: ?? . ?? ? ?? ( ?? ) + ??
?? ?? = ?? ?? ( ?? ?? . ?? ?
?? ?? ?? ?? ?? ?
?? )
When surface reaction controls show that
? ?? ?? ?
= ?? ?? =
?? ?? ?? ?? ?? ?? ( ?? ?? 2
?? ?? ? ?? ?? ?? ?? / ?? ?? )
1 + ?? ?? ?? ?? + ?? ?? /?? ?? ?
07
4 (a) Derive a performance equation for a catalytic batch reactor containing a batch of gas. 07
(b) What is temperature time trajectory for a catalytic reaction?
07
OR
4 (a) Derive an expression of concentration at the surface and at any time for the pore
diffusion resistance combined with surface kinetics for a cylindrical particle. Consider
the reaction is of first order.
07
(b) Derive a performance equation for a catalytic plug flow reactor for a first order
reaction.
07
5 (a) Write the expression for the different catalyst particle shapes effectiveness factor. Also
make a graph between effectiveness factor and the Thiele modulus for different
particle shapes.
07
(b) For the first order reaction the following rate concentration data is available
CA, mol/l 0.039 0.0575 0.075 0.092
-rA, mol A/h.kg
cat
3.4 5.4 7.6 9.1
Without using a rate equation, find the size of packed bed needed to treat 2000 mol/hr
of pure A at 117?C(C A0=0.1 mol/l, ?A=3) to 35% conversion at 3.2 atm.
07
OR
5 (a) A homogeneous gas reaction
?? ? 3 ??
has a reported rate at 215?C
? ?? ?? = 10
? 2
?? ?? 1
2
, ?????? / ?? . ??????
Find the space time needed for 80% conversion of a 50% A-50% inert feed to a plug
flow reactor operating at 215?C and 5 atm (C A0=0.0625 mol/l).
07
(b) Explain the mechanism for the enzyme-substrate reaction of Michaelis-Menton.
Derive the expression for the rate.
07
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This post was last modified on 20 February 2020