What are homogeneous and heterogeneous catalysts?

Answer:
When the reactants and the catalyst are in the same phase (i.e., liquid or gas), the process is said to be homogeneous catalysis.

2SO2(g) + O2(g)     NO(g)  2SO3(g)

The catalytic process in which the reactants and the catalyst are in different phases is known as heterogeneous.

2SO2(g)      Pt(s)  2SO3(g)

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What are Zeolites?


ANswer:

Zeolites are aluminosilicates, i.e., three dimensional network silicates in which some silicon atoms are replaced by aluminium atoms. They are shape selective catalysts, i.e., only those molecules having a size, small enough to pass their pores are adsorbed by them.
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Write the Freundlich adsorption isotherm for the adsorption from solution.

Answer:

For the adsorption from solution, Freundlich’s adsorption isotherm has the expression.


xm=kc1/n       where n>1c = concentration.
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How do the surface molecules have the tendency of adsorption?

Answer:

The molecules present on the surface of the liquid or solid experience unequal downward pull by bulk molecules and thus have strain 08 tension. This strain or tension is responsible for attracting and retaining the molecules on their surface.
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Give the Langmuir adsorption isotherm expression for the adsorption from solutions.

Answer:

The expression for the adsorption from solution given by Langmuir is
xm=aC1+bC,
where a and b are Langmuir constants. c = concentration.
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