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Example of steady-state diffusion is _______________

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Example of steady-state diffusion is _______________

(a) Hydrogen purification by palladium sheets

(b) Doping semi-conductors

(c) Corrosion resistance of aluminium

(d) Decarburization

I got this question in semester exam.

This question is from Role of Diffusion in Bioprocessing topic in section Mass Transfer of Bioprocess Engineering

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Correct answer is (a) Hydrogen purification by palladium sheets

The best I can explain: A practical example of steady-state diffusion – the purification of hydrogen gas. One side of a thin sheet of palladium metal is exposed to the impure gas composed of hydrogen and other gaseous species such as nitrogen, oxygen, and water vapor. The hydrogen selectively diffuses through the sheet to the opposite side, which is maintained at a constant and lower hydrogen pressure.

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