Differences between Homogeneous Catalysis and Heterogeneous Catalysis

Differences between Homogeneous Catalysis and Heterogeneous Catalysis

Homogeneous catalysis takes place when the catalyst and the other reactants are all dissolved in the same solution. Heterogeneous catalysis typically involves the use of a catalyst that is insoluble, or perhaps only weakly soluble, in the solution in which the reaction takes place. Thus, in heterogeneous catalysis, the catalyst and solution may form a suspension, or the catalyst may simply be a solid that is placed in the solution.

Differences between Homogeneous Catalysis and Heterogeneous Catalysis are mentioned below:

Homogeneous catalysis

  • These types of catalysts usually are common in either liquid phase or gas phase
  • Operative temperature for homogeneous catalysis is generally low except only when under high pressure
  • The heat transfer in homogeneous catalysis is very high as all the molecules of reactants and catalysts are in same phase
  • Recycling methods are not very cost effective as it’s a long drawn process and as it’s a difficult treatment method for spent catalysts
  • Modification of homogenous catalysts is very easy as it depends upon the tuning of electronic and steric properties on metal
  • Reaction mechanism easier to find as varied techniques are available

Heterogeneous catalysis

  • Heterogeneous catalysis are found in liquid phase, gas phase and solid phase.
  • Operative temperature for heterogeneous catalysis is harsh as compared to homogeneous process.
  • The heat transfer is relatively low as compared to homogeneous catalysis as the reactant molecules and catalysts are in different phase.
  • These catalysts although require reactivating treatment process but still quite cost effective.
  • The modification of heterogeneous catalysts is relatively difficult as the controlling methods of particle site as well as the active size at molecular level is really difficult.
  • Reaction mechanism is difficult to fins as the techniques utilized as the product is scrutinized and not the catalysts.

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