Table 2: (a) Percentage contribution of each Pt 4f component to the total peak area for freshly prepared specimens. (b) The same for an annual storage of the same specimens.
(a)

Percentage contribution of Pt 4f components
Catalyst supportPt0Pt(OH)PtOx
(71.1 eV)(72.7 eV)(74.8 eV)

Nb2O567.2%23.7%9.1%
Nb2O5-TiO265.3%34.7%
WO3- TiO261.9%26.7%11.4%
TiO256.8%31.9%11.3%

(b)

Percentage contribution of Pt 4f components
Catalyst supportPt0Pt(OH)xPtOx
(71.1 eV)(72.7 eV)(74.8 eV)

Nb2O558.3%25.6%16.1%
Nb2O5-TiO263.6%29.5%6.9%
WO3- TiO261.9%26.7%11.4%
TiO256.8%31.9%11.3%