Recent advances in iron-based high-temperature water-gas shift catalysis for hydrogen production

The high-temperature water-gas shift (HT-WGS) has received tremendous interest for the production of clean hydrogen in large scale. Iron-based oxide catalysts are widely studied for the HT-WGS reaction due to their high activity, durability, and relatively low manufacturing costs. In this review, we discussed the recent findings, especially, the role of different promoters on the HT-WGS performance of the Fe-based oxides catalyst. The review reported the recent attempts to replace the toxic Cr in the Fe/Cr-based catalysts. The article also reviews the structure-activity relations with various characterization techniques. Further, we highlighted the recent progress in understanding the catalyst structure and reaction mechanism during the reaction by in-situ and operando studies.