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2003 Course Catalysis (Elective I)

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Total No. of Questions : 12] P1365 [Total No. of Pages : 3 [3764]- 329 B.E. (Chemical Engineering) CATALYSIS (2003 Course) (409341) (Elective - I) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answers to the different sections must be written in separate answer books. 2) Assume suitable data, if necessary. SECTION - I Q1) a) b) Explain the mechanism of heterogeneous catalysis with suitable examples. [8] How homogeneous and heterogeneous catalysis is industrially useful?[8] OR Q2) a) b) Q3) a) b) Give a brief account of reaction feasibility with respect to activation energy and temperature in catalysis. [8] Explain the role of supports in heterogeneous catalysis. [8] Derive the relationship between size, number and total surface area of the crystallites. [8] Kinetic experiments on the solid catalyzed reaction A 2R are conducted at 8 atm and 700oC in a basket type mixed reactor of 640 cm3 volume and containing 1 g of catalyst of diameter dp = 3mm. Feed consisting of pure A is introduced at various rates into the reactor. Partial pressure of A in the exit stream is measured for each feed rate. Find a rate equation to represent the rate of reaction on catalyst of this size, using the following results: [10] Feed rate 100 22 4 1 0.6 litre/hr PA,out / PA,in 0.8 0.5 0.2 0.1 0.05 OR P.T.O. Q4) a) b) Derive Langmuir expression for first order adsorption and desorption.[8] The catalytic reaction A 3R is run at 3 atm and 215oC in a PFR which contains 9 g of catalyst and uses a feed consisting of the partially converted product of 0.3 liter/min of pure unreacted A. Assuming the reactor to be a differential reactor, find a rate equation to represent this reaction, using the following results: [10] Run 1 2 3 4 CA,in (mol/liter) 0.100 0.080 0.060 0.040 CA,out(mol/liter) 0.084 0.070 0.055 0.038 Q5) a) b) Write a brief note on co-catalysts. [6] The following kinetic data on the reaction A R are obtained in an experimental packed bed reactor using various amounts of catalyst and a fixed feed rate FAo = 12 kmol/hr. W (kg catalyst) 1 2 3 4 5 6 7 XA 0.12 0.20 0.27 0.33 0.37 0.41 0.44 i) Find the reaction rate at 40% conversion. ii) In designing a large packed bed reactor with feed rate FAo = 500 kmol/hr, how much catalyst would be needed for 40% conversion? iii) How much catalyst would be needed in part (ii) if the reactor employed a very large recycle of product stream? [10] OR Q6) a) b) [3764]-329 Write a brief note on triphase catalysis. [6] The second order reaction A R is studied in a recycle reactor with very large recycle ratio. Following data are recorded: Void volume of reactor = 1.2 liter Weight of catalyst used = 4 g Feed to the reactor: CAo = 2.4 mol/liter, Vo= 1.2 liter/hr Exit stream condition: CA,out= 0.6 mol/liter i) Find the rate constant for this reaction. ii) How much catalyst is needed in a packed bed reactor for 80% conversion of 1200 liter/hr of feed of concentration CAo=1.2 mol/ liter? [10] 2 SECTION - II Q7) a) b) Describe the impregnation method of catalyst preparation. State the role of each step in influencing the properties of catalyst. [8] Derive mathematical equation for determining catalyst surface area by BET method. [8] OR Q8) a) b) Explain the concept of dual functional catalysis. [8] Derive the mathematical model for kinetics of catalyst deactivation. [8] Q9) What is the relative activity and the degree of inhibition caused by a competitive inhibitor when [S]=Km and [I] = Ki? Derive the necessary equations. [16] OR Q10)Data for the enzyme catalyzed reaction S P is as follows: [S] (M) 6.25x10-6 7.50x10-5 1.00x10-4 1.00x10-3 1.00x10-2 v (nmoles.lit-1.min-1) 15.00 56.25 60.00 74.90 75.00 a) b) c) d) Estimate Vmax and Km. What would v be at [S] = 2.5x10-5 M and at [S] = 5.0x10-5 M? What would v be at 5.0x10-5 M if the enzyme concentration were doubled? How will you verify that v represents a true initial velocity? [16] Q11)Write short notes on the following. a) Zeolite modification. b) Alumina as a support. c) Protein. OR Q12)Write short notes on the following: a) Cracking catalyst. b) Industrial application of molecular sieves. c) Selectivity in zeolites. EEE [3764]-329 3 [18] [18]

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