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Catalyst - PowerPoint PPT Presentation


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Catalyst. What is catalyst function?. Catalyst function is providing an alternative reaction pathway with lower activation energy so that more reaction particles possess necessary energy to react. Modes of action of homogenous catalysts.

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Presentation Transcript
what is catalyst function
What is catalyst function?
  • Catalyst function is providing an alternative reaction pathway with lower activation energy so that more reaction particles possess necessary energy to react
modes of action of homogenous catalysts
Modes of action of homogenous catalysts
  • Homogeneous catalysis is catalysis process where reactants and catalysts are in same state (liquid, gas, solid)
  • Homogeneous catalysts can form intermediate compounds during the reaction..
modes of action of heterogeneous catalysts
Modes of action of heterogeneous catalysts
  • Heterogeneous catalysts are in different phase (state) from the reactants
  • Heterogeneous catalysts function by absorbing reactant molecules onto the surface of the catalysts.
outline disadvantages and advantages of homogeneous and heterogeneous catalysis
Advantages:

Homogeneous-

all the catalyst is exposed to the reaction

Heterogeneous

Easily removed from product by filtration

Disadvantages

Homogeneous---

hard to reuse

Heterogeneous—

only effective on the surface of product

Outline disadvantages and advantages of homogeneous and heterogeneous catalysis
discuss the factors in choosing a catalyst for a process
Selectivity

– will be catalyst produce only the desired product?

Efficiency

- will the catalyst cause a considerable increase in the rate?

- will it continue to work well under severe conditions, such as those experienced by catalytic converters in cars, as well as mild conditions

Environmental impact

– will it be easy to dispose of the catalyst without causing harm to the environment?

Potential for poisoning – catalysts rely on reactant occupying the active site reversibly.

Cost – industry is profit –based.

Discuss the factors in choosing a catalyst for a process