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2003 Course Catalysis Technology & Fluidization Eng.

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Total No. of Questions : 8] [Total No. of Pages : 2 [3664] - 331 P 1326 B.E. (Petrochemical) CATALYSIS TECHNOLOGY & FLUIDIZATION ENGINEERING (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer any 3 questions from each section. 2) Answers to the two sections should be written in separate answer books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 6) Assume suitable data, if necessary. SECTION - I Q1) a) b) c) Q2) a) b) c) Q3) a) b) c) Q4) a) b) c) Differentiate between physical adsorption and chemisorption. [6] With help of neat diagram explain how catalyst changes reaction pathways. [6] Write a short note on hetero - homogeneous catalysis. [4] Derive Langmuir Adsorption Theorem after stating important assumptions. [6] What is coke formation? How can we get - rid of it. [4] Highlight difference between LH model and Ridel model for catalytic reactions. [6] What are the desired properties of an industrial catalyst - explain in brief. [6] Explain various characterization methods of catalysts. [6] What are promoters? Discuss its importance in catalysis. [4] With help of neat sketch discuss manufacture of ammonia - highlight on the reactor and catalysts involved. [8] Catalysts is very important to refineries and petrochemical industries explain with help of suitable examples. [6] Write short note on Zeolites and highlight its stereo-selectivity. [4] P.T.O. SECTION - II Q5) a) b) c) Q6) a) b) c) Q7) a) b) Q8) a) b) c) What are advantages of fluidization? Explain your answer with a special emphasis to reaction engineering and heat transfer. [6] Define : Superficial Velocity, Particulate fluidization. [4] What are various types of fluidized particles? Highlight the importance of Geldart classification in this context. [6] With help of neat sketch explain Kunni-Levenspiel Model for performance of Fluidized bed reactor. [6] With help of suitable diagram explain the different phenomena and regimes occurring in a fluidized bed with increase in gas velocity. [6] Briefly explain concept of Davidson Cloud model. [4] With help of neat sketch explain operational principle of modern FCC unit. Highlight its catalyst properties and operating conditions. [8] With help of suitable figure explain different types of fluidized bed dryers and highlight their relative advantages and disadvantages. [8] With help of diagram explain the fluidization process and show how void fraction and pressure drop across the bed changes. [6] Write a short note on Particle Transport with major emphasis on carryover. [6] Define and explain : Sintering, Agglomeration, Regeneration. [6] [3664] - 331 -2-

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