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Mitigation of Methane Selectivity on Pt/KL-Zeolite Aromatization Catalysts by Ag Promotion

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Abstract

Silver addition, in low amounts (0.0054 or 0.013 %), to a 1 %Pt/KL catalysts prepared by a sequential CVD procedure using acetylacetonates resulted in improved benzene selectivity at similar conversion levels compared to the undoped 1 %Pt/KL CVD catalyst. Both hydrogenolysis and aromatization require an ensemble of atoms to constitute the active site, but hydrogenolysis is more structure sensitive. Silver, which is a relatively inert metal catalyst, blocks a fraction of Pt surface sites, lowering the overall n-hexane rate. When added in low levels, silver disrupts to a greater degree the Pt ensembles responsible for hydrogenolysis relative to those required for aromatization. This was confirmed by DRIFTS of adsorbed CO measurements, which showed that higher wavenumber bands attributed to larger Pt ensembles were suppressed to a greater extent relative to lower wavenumber bands (i.e., arising from smaller ensembles).

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Acknowledgments

The authors would like to thank the Commonwealth of Kentucky for funding.

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Authors and Affiliations

  1. Center for Applied Energy Research, University of Kentucky, 2540 Research Park Dr., Lexington, KY, 40511, USA

    Clement Bertaux, Gary Jacobs, Wilson D. Shafer & Burtron H. Davis

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  1. Clement Bertaux
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  2. Gary Jacobs
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  3. Wilson D. Shafer
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  4. Burtron H. Davis
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Correspondence to Burtron H. Davis.

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Bertaux, C., Jacobs, G., Shafer, W.D. et al. Mitigation of Methane Selectivity on Pt/KL-Zeolite Aromatization Catalysts by Ag Promotion. Catal Lett 146, 763–769 (2016). https://doi.org/10.1007/s10562-016-1696-7

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  • DOI: https://doi.org/10.1007/s10562-016-1696-7

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