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2003 Course Catalysis (Elective I)

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Total No. of Questions : 12] [Total No. of Pages : 3 [3864] - 329 P 1092 B.E. (Chemical Engg.) CATALYSIS (2003 Course) (409341) (Elective - I) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answers to the two sections should be written in separate books. 2) Assume suitable data, if necessary. 3) Neat diagrams must be drawn wherever necessary. SECTION - I Q1) a) b) Discuss the mechanism of homogeneous catalysis with two examples. [8] Explain catalytic reaction feasibility with respect to activation energy and temperature. [8] OR Q2) a) b) Explain the role of supports in heterogeneous catalysis. [8] Derive the relationship between size, number and total surface area of the crystallites. [8] Q3) a) Explain the important characteristics of catalyst and their industrial [8] significance. b) Solid catalyzed reaction A 3R is conducted at 10 atm and 800oC in a basket type mixed reactor of 0.7 lit volume and containing 1g of catalyst of diameter dp = 3 mm. Pure A is fed at various rates into the reactor. Partial pressure of A in the exit stream is measured for each feed rate. Find the rate of reaction using the following kinetic results : [10] Feed rate, lit/hr 100 22 4 1 0.6 0.8 0.5 0.2 0.1 0.05 PA, out / PA, in OR Q4) a) b) Explain Eley-Rideal mechanism for surface reaction. [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 lit/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 : P.T.O. Run CA, in (mol/lit) CA, out (mol/lit) Q5) a) b) 1 0.100 0.084 2 0.080 0.070 3 0.060 0.055 4 0.040 0.038 [10] Write a brief note on mass transfer in catalysis. [6] The reaction A 2R in an experimental packed bed reactor using various amounts of catalyst and a fixed feed rate FAo = 10 kmol/hr gives the following results. W (kg catalyst) XA 1 2 3 4 5 6 7 0.12 0.20 0.27 0.33 0.37 0.41 0.44 i) ii) Find the reaction rate at 50% conversion. In designing a large packed bed reactor with feed rate FAo = 500 kmol/hr, how much catalyst would be needed for 50% 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) c) Explain the reaction mechanism in phase transfer catalysis. [5] Explain concept of Thiele s Modulus and its application in catalysis. [6] Compare and contrast alumina and silica as catalyst support/carrier. [5] SECTION - II Q7) a) b) What is pore volume distribution? Describe the mercury penetration method for its measurement. What is N2 desorption method? [8] Derive the mathematical model for kinetics of catalyst deactivation.[8] OR Q8) a) b) Q9) a) Derive mathematical equation for determining catalyst surface area by BET method. [8] Describe the general method of preparation of metal catalysts. [8] Estimate k, the first order rate constant, for an enzyme preparation with Vmax of 4.8 mole/(lit.min) under the given experimental conditions. Km = 2 x 10 6 M. [6] [3864] - 329 -2- b) An enzyme was assayed at an initial substrate concentration of 2 x 10 5 M. In 6 min, half of the substrate has been used. The Km for the substrate is [10] 5 x 10 3 M. Calculate i) k, ii) Vmax and iii) the concentration of product produced after 15 min. OR [16] Q10)Data for the enzyme catalyzed reaction S P is as follows : [S] (M) 6.25 x 10 6 7.50 x 10 5 1.00 x 10 4 1.00 x 10 3 1.00 x 10 2 v (nmoles.lit 1.min 1) a) b) c) d) 15.00 56.25 60.00 74.90 75.00 Estimate Vmax and Km. What would v be at [S] = 2.5 x 10 5 M and at [S] = 5.0 x 10 5 M? What would v be at 5.0 x 10 5M if the enzyme concentration were doubled? How will you verify that v represents a true initial velocity? Q11)Write short notes on the following : a) Strong acid catalysts. b) Silica as a support. c) Protein. [18] OR Q12)Write short notes on the following : a) Cracking catalyst. b) ZSM-5. c) Shape selectivity in zeolites. [3864] - 329 -3- [18]

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