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We speculate that coke accumulation on the HY support was not effectively inhibited by Mg, since addition of the Mg did not impact the catalyst acidity. Furthermore, the lower coke content of the Mg-doped Mo2C/HY catalysts compared to the Mo2C/HY must be due to improved Mo2C dispersion (since the acidities were the same), and hence the improved hydrogenation of the Mg-doped catalysts reduced coke formation. In the case of the K-Mo2C/HY catalyst, however, both decreased acidity and increased Mo2C dispersion reduced coke formation compared to the Mo2C/HY catalyst.

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