Pune University BE Petrochemical Engineering Catalyst Science and Technology Question Papers

B.E. (Petrochemical) CATALYST SCIENCE AND TECHNOLOGY

(2008 Course) (Elective – IV) (Sem. – II)

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 tables is allowed.

6)            Assume suitable data, if necessary.

SECTION – I

Q1) a) What is adsorption isotherm? Write down important assumptions of Langmuir Adsorption Isotherm and obtain its mathematical expression.

b)            With the help of neat sketch explain how catalyst changes reaction pathways.                                                                                                            [6]

c) Write a short note on homogeneous catalysis.                                                                                         [4]

OR

Q2) a) Discuss the important characteristics of Industrial Catalyst.                            [4]

b)            Differentiate between Physical Adsorption and Chemisorption.              [6]

c)            Define: Active Site, Functionality, Turnover Frequency.                           [6]

Q3) a) Name various means and ways by which a catalyst can be deactivated – discuss all of them.                                                                                         [6]

b)  For the dual functional catalyst, following gas phase reaction : [10] A + B ^ Products

where, A and B are adsorbed independently on different sites (i.e. dual functionality) and the reaction is between adsorbed A with adsorbed B molecules. Derive the rate expression considering Langmuir- Hinshelwood mechanism in terms of partial pressure of the respective components.

Consider products are not adsorbed appreciably. If some inert gas Helium is also present, this is also strongly adsorbed on the surface, write down the modified rate expression.

OR

Q4) a) Differentiate between Langmuir – Hinshelwood Model and Rideal Model of Catalytic reaction.                                                                                             [6]

b)           Discuss the stepwise procedure of Catalytic reaction. Highlight the importance of rate limiting step in this context.                                                                    [6]

c)            Write a short note on Poisoning of Metallic Catalysts.                               [4]

Q5) a) What are catalyst support? Discuss their important characteristics. With help of neat diagram explain the Monolith Support.                                       [6]

b)           Name four different methods of Catalyst Synthesis. Explain any of the method in details.                                                                                                         [8]

c)            Write a short note on Promoters.                                                                     [4]

OR

Q6) a) An 15.7 gm of imported hydrogenation catalyst when studied with N2 adsorption reveals the following information :                                                                 [12]

Pressure (mm Hg)

6

70

110

240

380

452

Vol. ads. ( cm3)

68

147

172

215

267

318

 

The volumes obtained at 0°C and 1 atm pressure. Estimate the surface area of the catalyst.

Data: Density of liquid N2 at -195.8°C is 0.808 g/cm3

b) With a specially designed catalyst of 201.75 gm following data obtained : [6]

Vol. of Hg displaced by the sample = 113.8 cm3 Vol. of Helium displaced by the sample = 98.5 cm3 Calculate the pore volume and porosity of the catalyst particle from these information.

SECTION – II

Q7) a) What are Zeolites? Highlight their important characteristics. Discuss the shape selectivity of Zeolites and their industrial applications in details.                  [8]

b) Explain Fouling, Coking and Carbon Deposition in Catalyst, also discuss various methods of Regeneration.                                                                       [8]

OR

Q8) a) What are the sources of acidity in catalyst surface? Discuss the method of determination of acid strength.                                                                                     [8]

b) Discuss with help of suitable diagram Sintering, Mobility and Redispersion in case of supported metal catalysts.                                                                       [8]

Q9) a) With help of neat diagram discuss Fluidized Catalytic Cracking with proper emphasis on the catalyst used, operating condition, reaction time and regeneration of catalyst. [8]

b)            Discuss the industrial process of hydrodesulfurization operation. Give schematic diagram of the reactor. Highlight the operating condition as well.                           [8]

OR

Q10)a) Write a short note on multiphase catalysis for processing of hydrocarbons. In this context highlight the reaction engineering aspects as well. Name various types of reactors often employed.                                                                                       [10]

b)            Why vegetable oil need to be hydrogenated? With help of neat diagram explain the operation as done industrially.                                                                         [6]

 

Q11)a) Describe the process on manufacture of phthalic anhydride. Provide the detailed kinetics and Thermodynamics of the process. What are the by-products of the process, how can these be minimized. Discuss reactor configuration along with neat diagram. [10]

b)            Draw a schematic diagram of ammonia reactor, discuss all technical aspects associated with the design of the reactor.                                                                          [8]

OR

Q12)Write Short Notes on (any four) :                                                                             [18]

a)            Multitubular Catalytic Reactor

b)            Catalytic Reformer

c)            Fischer – Tropsch Synthesis

d)            Methanol Synthesis Reactor

e)            Styrene Manufacture from Ethylbenzene

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