The hydrodesulfurization of dibenzothiophene over a sulfided CoMo/Al 2 O 3 catalyst can be severely inhibited by 1,10-phenanthroline. The catalyst's hydrogenation activity is totally suppressed and cannot be fully recovered upon stripping of adsorbed nitrogen species. The bulk of the hydrogenolysis activity is suppressed but can be completely recovered upon stripping. Implications of these observations are discussed, including the possibility of a chelating-enhanced adsorption mechanism.
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