Reactions of two 13C-labeled methylpentanes, namely, 2-[2-13C] methylpentane and 2-[4-13C] methylpentane were performed at 220°C on two Pt-Ru bimetallic catalysts. Under these experimental conditions platinum and ruthenium are catalytically active. The results have shown the following points: i) the percentage of cyclic mechanism observed at 220°C, in the isomerization of 2-methylpentane to 3-methylpentane is very high (65 ° 2)%, ii) A high selectivity in the cracked products is found where branched hydrocarbons are favored, iii) a parallelism can be established between the large amount of selectively cracked products and the selective cyclic mechanism. All these catalytic results can be interpreted by the presence of sites formed of Pt and Ru where a cooperative effect exists between Pt and Ru which is due to metal-metal interactions and not to a merely geometric effect. These sites were named “activated Pt-Ru clusters”, .
ASJC Scopus subject areas
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films
- Materials Chemistry