Table 3. Surface atomic composition (at%) of fresh and reused Ni/PDC catalysts determined by XPS.
| Fresh catalyst (atom%) | Reused catalyst (atom%) | |
|---|---|---|
| Ni 2p | 8.5 | 8.1 |
| C 1s | 72.3 | 73.0 |
| N 1s | 12.4 | 11.9 |
| O 1s | 6.8 | 7.0 |
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