Chemical Process
In the manufacture of H₂SO₄, vanadium catalyst as compared to platinum catalyst

Handles lower SO₂ content gas (7 -10% SO₂), thus increasing the capital cost of the plant
Has a longer life and is not poisoned by arsenic
All of these
Gives higher conversion efficiency

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Chemical Process
Liquefaction of gases can not be done by

Adiabatic expansion through a throttle valve (Joule-Thomson expansion)
Adiabatic expansion against a piston or in a turbine
Merely compressing it beyond critical pressure
Exchange of heat with colder stream

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