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Summary of data obtained by Cu-XPS and Cu-LMM.
| Catalysts | Kinetic energy (eV) |
XCu+ (%) | XCu0 (%) | XIn0 (%) | |
|---|---|---|---|---|---|
| Cu+ | Cu0 | ||||
| Cu/SiO2 | 913.8 | 917.5 | 41.2 | 58.8 | – |
| Cu-0.25In/SiO2 | 914.3 | 917.6 | 41.6 | 58.4 | 12.3 |
| Cu-0.5In/SiO2 | 914.2 | 917.8 | 42.2 | 57.8 | 15.1 |
| Cu-1In/SiO2 | 914.1 | 917.8 | 42.0 | 58.0 | 19.7 |
| Cu-2In/SiO2 | 913.8 | 917.5 | 36.6 | 63.4 | 16.2 |
Note: XCu+ = Cu+/(Cu++Cu0) × 100 %; XCu0 = Cu0/(Cu++Cu0) × 100 %; XIn0 = In0/(In3++In0) × 100 %.
