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| Sample no. | Carboxylic acid (CA) agent | Ratio of CA : metal | Calcination temp. |
|---|---|---|---|
| S1 | Succinic acid | 1.5 : 1 | 1000 °C |
| S2 | Succinic acid | 3 : 1 | 1000 °C |
| S3 | Citric acid | 1.5 : 1 | 1000 °C |
| S4 | Citric acid | 3 : 1 | 1000 °C |
| S5 | Maleic acid | 1.5 : 1 | 1000 °C |
| S6 | Maleic acid | 3 : 1 | 1000 °C |
