Industrial hydrogen production via the iron-steam reaction (3Fe + 3H2O = Fe3O4 + 4H2) is avoided because it is__________________?
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Answer: D. All A , B. and C
Explanation
The iron-steam reaction proceeds slowly and requires intermittent thermal regeneration of the iron bed. Operating a batch-type cyclic process creates significant engineering challenges for continuous production. These operational drawbacks make the traditional iron-steam method obsolete for modern hydrogen manufacturing. The iron-steam process oxidizes iron with steam to produce hydrogen gas and iron oxide intermediates. Carbon monoxide from water gas is subsequently used to reduce the iron oxide back to metallic iron. The cyclic regeneration steps require complex valving and alternating reactant gas feeds in reactors.
Industrial hydrogen is predominantly produced via steam methane reforming rather than obsolete iron-steam methods. Chemical engineers evaluate reaction kinetics and continuity when selecting viable commercial plant designs. Avoiding discontinuous processes lowers capital and operating costs in modern chemical manufacturing plants. Stating the reaction is merely slow ignores the operational problems caused by its discontinuous nature. Claiming it is only a discontinuous reaction ignores the slow kinetics and developmental hurdles involved. Ignoring any of these valid drawbacks would fail to explain why the industrial process is avoided.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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