Abstract
Catalytic activities of partially metal ion exchanged X- and Y-type zeolites for the water gas shift reaction have been examined in the range 473–773 K. Among the zeolites, Cu 2+- or Ni 2+-zeolites showed good performance as shift catalysts in the respective reduced states. The activity of a CuNaX zeolite prereduced at 773 K by hydrogen was comparable to that of the practical catalyst CuOZnOCr 2O 3. The catalytic activities of the zeolites were shown to be related to the electronegativities of metal ions.
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