Abstract
Three reforming catalysts Pt/Al 2O 3, PtIr/Al 2O 3, and PtRe/Al 2O 3 have been sulfurized by H 2S. By treatment at 500 °C in a H 2 atmosphere, only a part of the adsorbed sulfur is easily removed. The remaining sulfur (S i) is localized on the metal at constant concentration irrespective of the H 2S level in the sulfurizing mixture. The obtained S i values for each of the catalysts Pt/Al 2O 3, PtIr/Al 2O 3, and PtRe/Al 2O 3 give an atomic ratio S i/Me (s) near 0.5. With the same sulfur coverage (S i) PtRe catalysts are more deactivated than Pt and PtIr catalysts. On the other hand, addition of small quantities of Ir to Pt increases sulfur resistance. Finally S i is a selective poison since the selectivity for hydrogenation-dehydrogenation related to hydrogenolysis is enhanced considerably. Hydrogenolyses of linear hydrocarbons are the most inhibited reactions.
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