Table 4 The oxygen vacancy content of the calcined and reduced forms of the Ni/CeO2 catalyst measured from ID/IF2g using Raman spectroscopy.

From: A novel process of triple-passed CO2 methanation over gradient-coated spiral-structured Ni/CeO2 catalysts

Catalysts

Calcined form

Reduced form

aID/IF2g

F2g (cm−1)

IF2g (counts)

D (cm−1)

ID (counts)

aID/IF2g

F2g (cm−1)

IF2g (counts)

D (cm−1)

ID (counts)

Ni/CeO2

0.47

454

1020

554

475

0.48

456

225

554

107

  1. aID/IF2g is the ratio of the peak intensities of the D and F2g modes used to measure the oxygen vacancy content.
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