Chemical Process
Liquefaction of gases can not be done by

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

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

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

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