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3. (a) (b) Answer ALL parts. Zeolites can be utilised as shape selective catalysts by exploiting the various shapes and
Posted: Sat May 21, 2022 4:07 pm
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- 3 A B Answer All Parts Zeolites Can Be Utilised As Shape Selective Catalysts By Exploiting The Various Shapes And 1 (139.76 KiB) Viewed 10 times
- 3 A B Answer All Parts Zeolites Can Be Utilised As Shape Selective Catalysts By Exploiting The Various Shapes And 2 (13.3 KiB) Viewed 10 times
3. (a) (b) Answer ALL parts. Zeolites can be utilised as shape selective catalysts by exploiting the various shapes and dimensions of zeolite pores and channels. Discuss three types of shape selective catalysis, illustrating your answer with suitable examples and diagrams in each case. [18 marks] Silicon-germanium is an important material that is used in the fabrication of transistors. The phase diagram for the silicon-germanium system is given below. A sample of composition 20 wt% Si is made up and held at 1150 °C. Based on this information, answer the following
questions: (1) What is the composition of any solid phase present? (ii) What is the composition of any liquid phase present? (iii) How much of each phase is present? (iv) What are the melting points of pure silicon and pure germanium? 1500 1400 Liquid (L) 1300 Temperature (°C) a+L 1200 LLLLLL 1100 Solid(a) 1000 900 0 Ge 20 40 60 80 100 Composition (wt% Si) Si [16 marks) Q3 continues overleaf-
(c) Using a suitable diagram, write a note on the rate of diffusion as it relates to solid-state reactions. [6 marks)