Relative ratio of surface contents of Ce3+.
| Condition | Surface content of Ce3+/% |
|---|---|
| CH4 flow without EF | 16.8 |
| CH4 flow with EF | 19.4 |
| Ar flow without EF | 16.2 |
| Ar flow with EF | 16.7 |
| CO2 flow without EF | 17.5 |
| CO2 flow with EF | 18.3 |
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