The pyrolysis of adamantane

Synthesis and Transformation of Linear Adamantane Assemblies inside Carbon Nanotubes

“…Experimentally, we know that adamantane molecules start to decompose at temperatures above 660 °C into liquid pyrolyzates including benzenes and alkylbenzenes as well as unsaturated gaseous components including ethylene by breaking and reconnecting CÀH and CÀC bonds. 23,36 We observed that adamantane turns into black shiny structures, possibly consisting of graphitized carbon, 37 and a yellow oily suspension under vacuum conditions. Within the confining volume of a nanotube, realized in our experiment, we may observe emergence of other carbon structures, including sp hybridized carbon chains, as the end product under vacuum conditions.…”

“…Our ab initio calculations indicate that the formation of carbon chains involves more than a single-step thermal conversion of adamantane to elemental carbon and hydrogen, since the reaction is a strongly endothermic process that requires a substantial amount of energy, Δ E = +20.8 eV per adamantane molecule. Experimentally, we know that adamantane molecules start to decompose at temperatures above 660 °C into liquid pyrolyzates including benzenes and alkylbenzenes as well as unsaturated gaseous components including ethylene by breaking and reconnecting C–H and C–C bonds. , We observed that adamantane turns into black shiny structures, possibly consisting of graphitized carbon, and a yellow oily suspension under vacuum conditions. Within the confining volume of a nanotube, realized in our experiment, we may observe emergence of other carbon structures, including sp hybridized carbon chains, as the end product under vacuum conditions.…”

Thermal Stability and Isomerization Mechanism of exo-Tetrahydrodicyclopentadiene: Experimental Study and Molecular Modeling

“…Adamantane is most likely produced from either exo-THDCP or other compounds and it is likely decomposed to other compounds. However, it has been shown that adamantane decomposes at temperatures greater than 873 K. 21 Therefore, in the reaction conditions of this study, adamantane could be only produced from the decomposition of exo-THDCP. The composition of adamantane, which has an activation energy of 155 kcal/mol, increased by 0.035% at 623 K, 0.257% at 663 K, and 0.269% at 683 K. These results showed that the production of a compound with high activation energy was lower than those with low activation energy, although we only considered production of these compounds from exo-THDCP and not other compounds and did not considered decomposition of these compounds to other low-molecular-weight molecules.…”

“…Adamantane is most likely produced from either exo -THDCP or other compounds and it is likely decomposed to other compounds. However, it has been shown that adamantane decomposes at temperatures greater than 873 K . Therefore, in the reaction conditions of this study, adamantane could be only produced from the decomposition of exo -THDCP.…”