Institutional Repository
Technical University of Crete
Technical University of Crete
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| URI: | http://purl.tuc.gr/dl/dias/0327E439-C392-4D1C-B445-94FD5498A955 | ||
| Year | 2002 | ||
| Type of Item | Peer-Reviewed Journal Publication | ||
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| Bibliographic Citation | I. V. Yentekakis, R. M. Lambert, M. Konsolakis and N. Kallithrakas-Kontos, "On the effects of residual chlorine and of barium promotion on Pt/γ-Al2O3 catalysts in the reduction of NO by propene", Catal. Lett., vol. 81, no. 3-4, pp. 181-185, Aug. 2002. doi:10.1023/A:1016520921545 https://doi.org/10.1023/A:1016520921545 | ||
| Appears in Collections |
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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