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On the effects of residual chlorine and of barium promotion on Pt/γ-Al2O3 catalysts in the reduction of NO by propene

Gentekakis Ioannis, Lambert Richard M., Konsolakis Michail, Kallithrakas-Kontos Nikolaos

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Περίληψη

Partial retention of chloride by Pt/γ-alumina catalysts prepared from chlorine-containing precursors markedly poisons both activity and nitrogen selectivity in the reduction of NO by propene. In the complete absence of chloride, Ba acts as a very strong promoter, dramatically improving activity, nitrogen selectivity and NO conversion. Very strikingly, when Ba is used to promote a catalyst prepared from chloride-containing precursors, all the original chloride is retained, yet the catalyst exhibits very strong promotion, and in every aspect its behavior is identical to that of the chloride-free Ba-promoted catalyst. This behavior is rationalized in terms of BaCl2 formation and the relative effects of Cl and Ba in inhibiting and promoting, respectively, the dissociation of chemisorbed NO—the reaction-initiating step.

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