What are heterogenous catalysis? Give examples.

When the catalyst exists in a different phase than that of reactants, it is said to be heterogeneous catalyst, and the catalysis is called heterogeneous catalysis. For example, SO2 can be oxidized to SO3 using vanadium pentaoxide (V2O5or platinum (Pt) as catalyst.

1023_heterogeneous catalysis.png 

Here, V2O5 is solid, while the reaction reactants are gaseous. This reaction is employed during the manufacture of sulphuric acid by Contact Process.

In heterogeneous catalysis, the catalyst is generally solid while the reactants are gases and the reaction starts from the surface of the solid catalyst. That, is why heterogeneous catalysis is also is also called surface catalysis.

Some more examples of industrially important heterogeneous catalytic reactions are:
Manufacture of NH3 from N2 and H2 by Haber's process, using iron as catalyst.

794_heterogeneous catalysis1.png 
Manufacture of CH3OH from CO and H2 using (a mixture of Copper, ZnO and Cr2O3) as catalyst.

1590_heterogeneous catalysis2.png 
Oxidation of NH3 with O2 using Pt as catalyst in Ostwald process.

73_heterogeneous catalysis3.png 
Oxidation of polluting gases such as CO and NO into non-toxic gases by the catalytic converter in the car's exhaust system. The catalytic converter consists of a mixture of transition metals such as platinum, palladium and rhodium. These catalysts oxidize CO and unburnt hydrocarbons to CO2 and H2O and reduce oxides of nitrogen to N2.

618_heterogeneous catalysis4.png 
Hydrogenation of oils to form vegetable ghee using finely divided nickel as catalyst.

954_heterogeneous catalysis5.png

Polymerization of ethylene using TiCl3 and trialkyl aluminium (Ziegler-Natta method) as catalyst.

   Related Questions in Chemistry

  • Q : Show your calculations Superphosphate

    Superphosphate has the formulae: CaH4 (PO4)2H2).  Calculate the percentage of phosphorus in this chemical.  Show your calculations  (around ten lines);  also Work out how to make up a nutrient mixtur

  • Q : Problem based on mole concept Choose

    Choose the right answer from following. An aqueous solution of glucose is 10% in strength. The volume in which mole of it is dissolved will be : (a) 18 litre (b) 9 litre (c) 0.9 litre (d) 1.8 litre

  • Q : P- block why pentahalids are more

    why pentahalids are more covalent than tetrahalids

  • Q : Concentration of Sodium chloride

    Provide solution of this question. If 25 ml of 0.25 M NaCl solution is diluted with water to a volume of 500ml the new concentration of the solution is : (a) 0.167 M (b) 0.0125 M (c) 0.833 M (d) 0.0167 M

  • Q : Haloalkane how haloalkane can be

    how haloalkane can be prepared by refluxing alcohol with hydrohalic acids

  • Q : Chemists have not created a periodic

    Explain the reason behind that the chemists have not created a periodic table of compounds?

  • Q : Problem based on molarity Select the

    Select the right answer of the question. If 18 gm of glucose (C6H12O6) is present in 1000 gm of an aqueous solution of glucose, it is said to be: (a)1 molal (b)1.1 molal (c)0.5 molal (d)0.1 molal

  • Q : Explain various chemicals associated

    During processing of food, several chemicals are added to it to augment its shelf life and to make it more attractive as well. Main types of food addi

  • Q : Explain preparation and properties of

    It may be prepared by the action of phosphorus on thionyl chloride.P4 + 8SOCl2    4

  • Q : Dipole attractions-London dispersion

    Describe how dipole attractions, London dispersion forces and the hydrogen bonding identical?

©TutorsGlobe All rights reserved 2022-2023.