Summary
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1.
The chief reaction in conversion of xylenes under a pressure of 100 atm at a temperature of 520° in the presence of a MoO3 + Al2O3 catalyst is demethylation and formation of toluene.
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2.
Simultaneously with demethylation occurs a reaction of hydrogenation of the xylenes and the products of their demethylation and isomerization of the six membered naphthenes into five membered ones.
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3.
The rate of conversion of the xylenes depends on the position of the methyl groups in the nucleus and increases in the order m-xylene<p-xylene<o-xylene.
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Literature cited
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Krichko, A.A., Sovetova, L.S. High temperature hydrogenation destruction of xylenes. Russ Chem Bull 10, 1587–1588 (1961). https://doi.org/10.1007/BF00906161
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DOI: https://doi.org/10.1007/BF00906161