E. Odebunmi, D. Ollis
Mar 1, 1983
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Journal
Journal of Catalysis
Abstract
The hydrodeoxygenation (HDO) of o-, m-, and p-cresols on HDS catalysts (sulfided CoOMoO3γ-Al2O3) at 225–400 °C and 68 atm hydrogen gives toluene and methylcyclohexane as the major products on both fresh and aged HDS catalyst. The relative reactivities of the cresols are found to be meta > para > ortho. HDO activity is slowly lost with time, but hydrogenation activity drops more rapidly and is less recoverable with reductive/sulfiding regeneration. As a consequence, the hydrogen consumption per atom of oxygen removed in cresol hydrodeoxygenation declines nearly 50% as the catalyst ages. The fresh catalyst operating at lower temperatures (225–275 °C) gives primarily a consecutive conversion pattern (cresol → toluene → methylcyclohexane), while the less active aged catalyst used at higher temperatures (350–400 °C) appears to exhibit a parallel path behavior to toluene and methylcyclohexane from a common surface intermediate. Ring saturation prior to hydrodeoxygenation does not appear to be necessary.