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2003 Course Catalysis Technology & Fluidization Eng.

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Total No. of Questions : 10] P1530 [Total No. of Pages :3 [3764] - 401 B.E. (Petrochemical) CATALYSIS TECHNOLOGYAND FLUIDIZATION ENGINEERING (2003 Course) Time : 3 Hours] [Max. Marks:100 Instructions to the candidates: 1) Answer three questions from each section. 2) Answers to the two sections should be written in separate 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 table is allowed. 6) Assume suitable data, if necessary. SECTION - I Q1) a) With the help of neat sketch explain how catalyst changes reaction pathways. [6] b) Name various means and ways by which a catalyst can be deactivated discuss all of them. [6] c) Write a short note on homogeneous catalysis. [4] Q2) a) Derive Langmuir Adsorption Isotherm with help of the important assumptions. [6] b) For the catalytic gas phase reaction: M + N P, derive the rate expression considering Langmuir- Hinshelwood mechanism in terms of partial pressure of the respective components. Note that all the reactants and products are adsorbed appreciably. If some inert gas Helium is also present, this is also strongly adsorbed on the surface, write down the modified rate expression. [10] Q3) a) A specially designed catalyst with mass of 314.67 gm displaces 102.4 cm3 Helium. The same catalyst sample is reported to displace 134.6 cm3 of Mercury in another study. Calculate pore volume of the sample and particle porosity. [6] P.T.O. b) Write down important characteristics needed for a catalyst sample to be suitable for industrial applications - Elaborate on each of them. [6] c) What are the role of catalyst support? Name four catalyst support. [4] Q4) a) What are Zeolites ? Why they are used heavily now-a-days? Discuss the shape selectivity of Zeolites and its applications. [6] b) Describe any method of catalyst manufacture in details. [6] c) What is Sintering? Explain with help of neat sketch. [4] Q5) Write Short Notes on (any four) : [18] a) Characterization of Catalyst. b) Adsorption Isotherm. c) Poisoning of Metal Catalysts. d) Hydrodesulfurization reactor and its catalysts. e) Auto Emission Catalysis. f) Catalyst Regeneration. SECTION - II Q6) a) b) c) Q7) a) Explain the process of fluidization with help of neat diagram. Discuss the minimum superficial gas velocity and its significance. [6] Differentiate between group of particles as classified by Geldart. Provide appropriate examples of each group. [6] Write a short note on quality of fluidization. [4] Discuss all the advantages of fluidized bed system. [6] b) With help of rough sketch discuss various types of gas distributor for fluidized bed - Compare their performances. [6] c) What is pneumatic conveying? Discuss its applications Q8) a) [4] In a fluidized bed, mixing is combined effort of plug flow and mixed [6] flow mode - Explain with help of neat diagram. b) Discuss the bubble movement through the fluidized bed. c) Write down important assumptions of Kuni-Levenspiel model and discuss the model qualitatively. [6] [3764]-401 2 [4] Q9) a) Explain the principle of immersed tube fluidized bed heat transfer medium. Highlight its advantages and disadvantages. [8] b) With help of schematic diagrams explain operations of various types of fluidized bed driers. [8] Q10)a) Explain the operation of modern fluidized bed catalytic cracker with help of neat sketch. [6] b) Discuss Sintering and Aglomeration in fluidization operation. c) Define: Superficial gas velocity, minimum fluidization velocity, minimum bubbling velocity and minimum slugging velocity. [4] d) Write down all the major disadvantages faced by fluidization. kbkb [3764]-401 3 [4] [4]

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