Abstract
Abstract The influence of the Na addition to Pt/Al 2 O 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 2 O 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 2 O 3 catalysts inhibits the formation of coke deposited on the metallic sites and the support.
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