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- W2017751298 abstract "The role of chlorine and the thermal pretreatments of the samples in PtRe alloying during the reduction of PtAl2O3 and PtReAl2O3 systems have been examined by using the reaction of n-butane hydrogenolysis with the aid of temperature-programmed reduction (TPR) experiments. The presence of chlorine modifies only slightly the TPR profiles, and rhenium reduction is always catalyzed by the presence of platinum. This effect depends strongly on the hydration degree of the support, while it is almost independent of the chlorine content of the sample. However, chlorine greatly decreases the catalytic activity of both Pt and PtRe catalysts in n-butane hydrogenolysis. Selectivity to methane (measured as C3C1 ratio) is close to 1 for the platinum samples, while in the PtRe systems it remains close to 0.5 for the chlorine-free catalyst after all the pretreatments, but changes from 0.5 to 1.0 when the chlorinated catalyst is predried at increasing temperatures, indicating differences in the degree of PtRe alloying. Chlorination/dechlorination experiments confirm the role of chlorine on the above results and point to the existence of oxychlorinated Pt and/or Re species that may strongly interact with the progressively dehydrated Al2O3 support, leading to higher metallic dispersions and lower PtRe alloying in the chlorinated catalysts after hydrogen reduction." @default.
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- W2017751298 title "Effect of chlorine in the formation of PtRe alloys in PtRe/Al2O3 catalysts" @default.
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- W2017751298 doi "https://doi.org/10.1016/0021-9517(89)90058-4" @default.
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