Reactions ofn-hexane andn-nonane on Pt catalysts and hydrogenating off hydrocarbonaceous adspecies after reaction

Abstract

Abstractn-Hexane and n-nonane were reacted on Pt black, 6% Pt/SiO2, 0.8% Pt/KL zeolite and a 0.6% industrial Pt/A1203 catalyst. Selectivities were compared at -10% conversion. After reaction, the catalyst was exposed to 1-I2 and the hydrocarbons leaving the catalysts were analyzed. The amount of hydrocarbons left the catalysts decreased in the sequence Pt black> Pt/SiO2> Pt/KL>Pt/A1203. The composition of removed hydrocarbons gave important -although indirectinformation on the possible state of "hydrocarbonaceous deposits" during catalysis.

Surface and bulk structural response of Pt black upon its hydrogen treatment and catalytic reaction with n-hexane

“…This latter process may be important in regeneration and can lead to carbon removal as methane. 49 Skeletal reactions of n-hexane reportedly require various active sites. They are ensembles of threefold symmetry for benzene formation,50 two neighbouring atoms for ring C 5 closure and opening51 while larger ensembles may possibly be active for fragmentation.…”

Enhanced Nucleation and Growth of Diamond Film on Si by CVD Using a Chemical Precursor

“…However, Pt adsorbs the hydrocarbons; therefore, a chemical reaction not only has taken place with adamantane but also may have taken place with hexane (C 6 H 14 ). Previous studies have shown that the hexane can react with Pt . The melting point of Pt (∼1772 °C) is much higher than the growth temperatures used in this study.…”

“…Previous studies have shown that the hexane can react with Pt. 47 The melting point of Pt (∼1772 °C) is much higher than the growth temperatures used in this study. The solid solubility of C in Pt is less than 1 atom % at 650 °C according to the PtÀC binary phase diagram.…”