Averaged Grain Size (DXRD) and Particle Size (DTEM) of samples.
| Sample | D XRD a (nm) | D TEM b (nm) | ||||
|---|---|---|---|---|---|---|
| Freshc | H2d | Usede | Freshc | H2d | Usede | |
| Nb2O5 | 11.9 | — | — | 11.3 ± 2.4 | — | — |
| 1 Pt–Nb2O5 | 14.9 | 12.5 | 13.5f | 12.4 ± 2.6 | 12.1 ± 1.9 | 13.1 ± 2.3f |
| 10.8g | ||||||
| 0.5 Pt–Nb2O5 | 11.7 | — | 9.6f | — | — | — |
| 13.7g | ||||||
| 0.3 Pt–Nb2O5 | 13.3 | 12.5 | 10.8f | 11.2 ± 2.8 | 11.7 ± 2.5 | 11.1 ± 3.1f |
| 11.4g | ||||||
| 0.1 Pt–Nb2O5 | 12.6 | — | 13.4f | — | — | — |
| 12.4g | ||||||
| 0.05 Pt–Nb2O5 | 10.4 | — | 10.7f | — | — | — |
| 10.7g | ||||||
a
Calculated from XRD patterns by Scherrer equation.
b
Statistic data on the basis of TEM images.
c
Fresh samples.
d
After H2-pretreatment.
e
Used samples after CO oxidation.
f
After CO oxidation with H2-pretreatment.
g
After CO oxidation with O2-pretreatment.