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Characteristics of the metallic phase of Pt/Al2O3and Na-doped Pt/Al2O3catalysts for light paraffins dehydrogenation

Authors
Journal
Chemical Engineering Journal
1385-8947
Publisher
Elsevier
Publication Date
Volume
118
Issue
3
Identifiers
DOI: 10.1016/j.cej.2006.02.004
Keywords
  • Pt/Alumina Catalysts
  • Na-Doped Alumina
  • Butane Dehydrogenation
Disciplines
  • Mathematics

Abstract

Abstract The influence of the Na addition to Pt/Al 2O 3 catalysts is analyzed in this paper, not only on the characteristics and properties of both the acid and metallic function, but on the activity, selectivity and deactivation in the n-butane dehydrogenation reaction. The addition of increasing amounts of Na to Pt/Al 2O 3 catalyst modifies both the nature of the acid function (by poisoning the stronger acid sites) and the metallic phase (by a geometric modification the metallic phase). These modifications would be the responsible for the sharp diminution of deactivation of the catalysts due to the carbon deposition. Na addition to Pt/Al 2O 3 catalysts inhibits the formation of coke deposited on the metallic sites and the support.

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