n-hexane was reacted on two Pt-Sn/Al2O3 catalysts, one prepared by coimpregnation (T) the other by using a bimetallic PtSn complex precursor (N). Both catalysts produced isomers, methylcyclopentane fragments and benzene, the aromatic selectivity being higher on catalyst N. The hydrocarbon entities remaining after reaction were removed by hydrogen treatment. They contained methane, C2-C5 fragments (not observed on Pt, thus unique for PtSn) and benzene. The possible state and composition of chemisorbed carbonaceous entities during reactions are discussed. More hydrocarbons, including slightly more methane could be hydrogenated off from catalyst N of lower dispersion. The higher overall activity of catalyst N in the presence of more than one C per surface Pt points to its higher coke tolerance.
- Catalyst carbonization
- Complex bimetallic precursor for Pt-Sn
- Hydrocarbonaceous deposits
- Hydrogenation of coke precursors
- Platinum-tin catalysts
- Pt-Sn/AlO3 catalysts
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