Low-temperature WGSR

So many metals have been reported for the low-temperature WGSR. The two main categories are non-noble metal catalysts and noble metal catalysts. The following section explains the various metal catalysts investigated for the low-temperature WGSR. 

The two main non-noble metal catalysts investigated for the low-temperature WGSR are Cu and Ni. 

Hossain et al. [23] reported Cu-Fe-Cr and Cu-Fe-Mn catalysts and they compared with commercial catalysts. Cu-Fe-Mn catalyst showed significantly higher CO conversion than the commercial Cu-Zn0/Al203 catalyst, while the activity of Cu-Fe-Cr catalyst is lower than that of the commercial catalyst. Thouchprasitchai et al. [24] reported Cu-Fe, Cu-Zn and Cu-Fe-Zn catalysts. The ternary catalyst shows better activity compared to binary catalysts. Takehira et al. [25] investigated alkali metal-doped Cu/Zn catalysts for low-temperature WGSR. The highest activity is obtained for Cu/MgO/ZnO catalysts. The Cu/MgO ZnO catalyst... 

Rebrov efa/. [ 114] synthesized 1 wt%Au supported on mesoporoustitania thin films for low-temperature WGSR. The catalyst is very stable for 72 h of operation. 

Most of the studies show that some of the kinetic expressions valid for high-temperature WGSR are also valid for low-temperature WGSR. Shchibiya et al. found a kinetic expression similar to high-temperature kinetic equation based on Cu0/Zn0/Cr203 [2b]. Later Uchida et al. [49] confirmed that the kinetic expression derived from redox mechanism accurately correlated the kinetic data obtained with the Cu-Zn catalysts. Cherednik et al. [50] proposed other equation for a commercial catalyst (2u0/Zn0/Cr203... 

Application of a silica membrane supported on molecular sieve to the low-temperature WGSR at 280°C was reported by Giessler et al. [57]. Although almost complete conversion of CO was claimed, the low H2/N2 separation of the membrane opened up a possibility for CO to cross the membrane to the sweep stream and for the sweep gas to enter the product stream, artificially boosting the conversion. 

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