The conversion of carbon monoxide by steam is an important source of hydrogen, and therefore naturally belongs downstream of the reformer. This reaction accounts for around 15% of total hydrogen production.
The reaction involving the conversion of carbon monoxide by water vapour has been known and used for a very long time. Its simplicity and the absence of secondary reactions have led to the Water Gas Shift (WGS) reaction being considered:
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(1) - SIRCAR (S.), GOLDEN (T.C.) - Purification of hydrogen by pressure swing adsorption. - Separation Science and Technology, 35(5), p. 667-687 (2000).
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