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Revisiting magnesium oxide to boost hydrogen production via water-gas shift reaction: Mechanistic study to economic evaluation
Courtesy of Hiden Analytical Ltd.
Although numerous defects can be generated on MgO by a novel synthesis route, research on MgO-supported catalysts is rare because the reported activities were not sufficient to replace other supports. We reported MgCeOx-supported Cu (MgCuCe) catalyst beads with several hundreds of micrometer size, featuring a unique macroscopic structure.
The as-prepared catalysts showed unprecedented enhancements in the reaction activity in the water-gas shift (WGS) reaction, showing a significantly higher reaction rate of 83 μmol g‒1 s‒1 at 300 °C than that without MgO (30 μmol g‒1 s‒1). The underlying WGS reaction mechanism was illustrated by using an on-line mass spectrometer (Hiden HPR 20) coupled with other analyzers. CO-TPD-MS (Figure 1(a)) and in situ DRIFTS revealed that numerous defects in the MgCuCe catalysts promoted water dissociation and the subsequent associative mechanism. Numerous mono-coordinated and higher-coordinated OH groups were present on the MgCuCe catalysts because the dissociation of water was promoted by MgO with defects. And a large amount of carboxylate and formate species was formed by the adsorbed OH groups and CO on Cu+. The formation of the carboxylate species was dominant at low S/C ratios. On the other hand, a large quantity of the formate species was produced at high S/C ratios owing to the favorable interaction between the formate species and neighboring OH groups.
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