Formation of carbonaceous deposits from n-hexane, methane and 1,5-hexadiene has been investigated at 673 Kover Pt/SiO2 catalysts of differing dispersion. The measurements with 1,5-hexadiene, 2,4-hexadiene and trans-hexatriene over SiO2 have confirmed the monofunctional behaviour of the catalysts. The initial C/PtS value is smaller, the subsequent rate of deposit formation and the fraction of "free" sites are higher on highly dispersed samples than on poorly dispersed ones. On catalysts of high Pt dispersion the C-C bond rupturing activity might impede the transformation of C6 entities into graphitic deposits.
ASJC Scopus subject areas
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films
- Materials Chemistry