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Describe some features of catalysis by z...

Describe some features of catalysis by zeolites.

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Zeolites are shape selective catalysts. It is due to their honeycomb-like structure. They are microporous aluminosilicates with three dimensional network of silicates in which same Si atoms are replaced by Al atoms giving Al-O- Si frame-work. The reactions catalysed by zeolites depend upon the size and shape of reactant and product molecules as well as upon the pores and cavities of zeolites.
Zeolites are widely used as catalysts in petrochemical industries for cracking of hydrocarbons and isomerisation. An important zeolite catalyst used in petroleum industry in ZSM-5%. It converts alcohols directly into petrol by dehydrating them to give a mixture of hydrocarbons.
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Zeolites are alumina-silicates that are micro-porous in nature. Zeolites have a honeycombIike structure, which makes them shape-selective catalysts. They have an extended 3D-network of silicates in which some silicon atoms are replaced by aluminium atoms, giving them an Al-O-Si framework. The reactions taking place in zeolites are very sensitive to the pores and cavity size of the zeolites. Zeolites are commonly used in the petrochemical industry. A catalytic reaction which depends upon the pore structure of the catalyst and on the size of the reactant and the product molecules is called shape-selective catalysis. For example, catalysis by zeolites is a shapeselective catalysis. The pore size present in the zeolites ranges from 260-740 pm. Thus, molecules having a pore size more than this cannot enter the zeolite and undergo the reaction. What is the pore size of Zeolites ?

Read the given passage and answers following questions : Zeolites are alumino-silicates that are micro-porous in nature. Zeolites have a honeycomb like structure, which makes them shape-selective catalysts. They have an extended 3D-nelwork of silicates in which some silicon atoms are replaced by aluminium atoms, giving them an Al-O-Si framework. The reactions taking place in zeolites are very sensitive to the pores and cavity size of the zeolites. Zeolites are commonly used in the petrochemical industry. A catalytic reaction which depends upon the pore structure of the catalyst and on the size of the reactant and the product molecules is called shape-selective catalysis. For example, catalysis by zeolites is a shape selective catalysis. The pore size present in the zeolites ranges from 260-740 pm. Thus, molecules having a pore size more than this cannot enter the zeolite and undergo the reaction. In which chemical industry Zeolites used ?

Read the given passage and answers following questions : Zeolites are alumino-silicates that are micro-porous in nature. Zeolites have a honeycomb like structure, which makes them shape-selective catalysts. They have an extended 3D-nelwork of silicates in which some silicon atoms are replaced by aluminium atoms, giving them an Al-O-Si framework. The reactions taking place in zeolites are very sensitive to the pores and cavity size of the zeolites. Zeolites are commonly used in the petrochemical industry. A catalytic reaction which depends upon the pore structure of the catalyst and on the size of the reactant and the product molecules is called shape-selective catalysis. For example, catalysis by zeolites is a shape selective catalysis. The pore size present in the zeolites ranges from 260-740 pm. Thus, molecules having a pore size more than this cannot enter the zeolite and undergo the reaction. What is the pore size of Zeolites ?

Zeolites are alumina-silicates that are micro-porous in nature. Zeolites have a honeycombIike structure, which makes them shape-selective catalysts. They have an extended 3D-network of silicates in which some silicon atoms are replaced by aluminium atoms, giving them an Al-O-Si framework. The reactions taking place in zeolites are very sensitive to the pores and cavity size of the zeolites. Zeolites are commonly used in the petrochemical industry. A catalytic reaction which depends upon the pore structure of the catalyst and on the size of the reactant and the product molecules is called shape-selective catalysis. For example, catalysis by zeolites is a shapeselective catalysis. The pore size present in the zeolites ranges from 260-740 pm. Thus, molecules having a pore size more than this cannot enter the zeolite and undergo the reaction. Upon which factor a catalytic reaction of shape selective catalyst depends ?

Read the given passage and answers following questions : Zeolites are alumino-silicates that are micro-porous in nature. Zeolites have a honeycomb like structure, which makes them shape-selective catalysts. They have an extended 3D-nelwork of silicates in which some silicon atoms are replaced by aluminium atoms, giving them an Al-O-Si framework. The reactions taking place in zeolites are very sensitive to the pores and cavity size of the zeolites. Zeolites are commonly used in the petrochemical industry. A catalytic reaction which depends upon the pore structure of the catalyst and on the size of the reactant and the product molecules is called shape-selective catalysis. For example, catalysis by zeolites is a shape selective catalysis. The pore size present in the zeolites ranges from 260-740 pm. Thus, molecules having a pore size more than this cannot enter the zeolite and undergo the reaction. Upon which factor a catalytic reaction depends ?

BETTER CHOICE PUBLICATION-SURFACE CHEMISTRY -Question Bank
  1. What do you understand by activity and selectivity of a catalyst ? Giv...

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  2. What is shape selective catalysis?

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  3. Describe some features of catalysis by zeolites.

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  4. How do enzymes differ from catalysts ?

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  5. What are Enzymes ? Give important characteristics of enzyme catalysis.

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  6. Give the mechanism of heterogeneous catalysed reaction.

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  7. Explain two applications of enzymes.

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  8. What are colloids ?

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  9. which are the properties of colloidal solution ?

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  10. What is the difference between true solution and colloidal solution?

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  11. Give three differences between suspension and colloid solution.

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  12. Name the dispersed phase and dispersion mediumin fog.

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  13. Comment on the statement that “colloid is not a substance but a state ...

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  14. What are lyophilic and lyophobic sols ? Give one example of each. Why ...

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  15. What are gels ? Give an example of elastic and non-elastic gel.

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  16. How will you differentiate Lyophilic colloids from Lyophobic colloids?

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  17. Lyophillic colloids are more stable than lyophobic colloids. Explain.

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  18. What is the difference between multimolecular and macromolecular collo...

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  19. Give three differences between multimolecular colloids and macromolecu...

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  20. What are micelles ? Give one example of a micellar system.

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