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| These observations are also consistent with the XRD results of Table 1 and Fig. 3. The summary of the TGA analysis, shown in Table 3, demonstrates that the total weight gain of the un-used catalysts decreased from 6.1% to 4.0% as the Mg loading increased from0.5% to 2%. As noted previously, the weight gain was mainly caused by the oxidation of Mo2C. This suggests that the amount of oxidizable Mo2C on the Mo2C/HY catalysts decreased in the presence of Mg, probably because of a higher Mo2C dispersion that results in stronger interaction between the Mo2C and the HY support, yielding Mo2CxOy species and making the Mo2C less oxidizable. |
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