✍ Scribed by Robert Wandas; Jan Surygala; Ewa Śliwka
No coin nor oath required. For personal study only.
The hydroconversion of o-, m-and p-cresols in three-component model mixtures with naphthalene and n-hexadecane was investigated over a CoMo/AI203 catalyst at 360°C, a hydrogen pressure of 7 MPa and a reaction time of 60 rain. The results were compared with those obtained for cresols and naphthalene as single model compounds. A lower efficiency of cresol hydrodeoxygenation as well as naphthalene hydrogenation in the mixtures was found than in the conversion of the single compounds. Conversion mechanisms of cresols in the mixtures with naphthalene are considerably more complex than for individual components. Beside typical catalytic reactions, they include radical reactions in which tetralin, formed by naphthalene hydrogenation, participates as a labile-hydrogen source. The cresol reaction products in such systems include phenol, xylenols, xylenes and dimethycyclohexanes, i.e. compounds essentially absent in hydroconversion of cresols as single substances. Under the experimental conditions, the hydrodeoxygenation efficiency of the cresol isomers decreases in the sequence: para > meta > ortho.
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