Highly selective hydrogenation of acetylene over reduced graphene oxide carbocatalyst

Active Sites and Their Individual Turnover Frequencies for Ethylene Hydrogenation on Reduced Graphene Aerogel

“…Furthermore, our findings align also well with the study of Abakumov et al, who reported that structural defect sites are active for hydrogenation, while N- and O-containing functional groups are rather modifiers. In a more recent study by Abakumov and co-workers, it was demonstrated that two types of active sites might be influencing the acetylene hydrogenation reaction: One associated with structural defects resulting in methane formation and a other one is leading to hydrogenation.…”

“…Next, assuming the defect sites are the active sites for the hydrogenation reaction based on Figure S8 and references, , we considered the per-gram activity measured on each catalyst as the sum of individual total turnovers provided by each type of defect sites as presented in eq . Considering four of these rGA catalysts separately, we ended up with four different equations having four unknowns representing the individual TOFs of the D*, D, D″, D′ sites (eq S1, in SI). rat e n g cat = prefix∑ i 4 TO normalF i × number 0.25em of 0.25em active site s i , n g cat Where n and i represent the rGA sample and the type of active site, respectively.…”

“…The carbocatalysts are gaining interest with the emergence of such a new class of graphene derivatives. It was demonstrated that these novel materials are applicable to a variety of reactions, such as hydrogenation, − which often requires the presence of an expensive noble metal.…”

“…For the rational design of these novel materials, the active sites should be identified and quantified, and their individual catalytic performances should be assessed. As summarized above, the active sites for hydrogenation reactions are claimed to be associated with the defect sites. , Hence, we aimed at developing a deeper level understanding of the identities of these active sites and their corresponding contributions to the overall catalytic performance. We prepared a family of rGAs, synthesized by treating the as-prepared GA in flowing Ar at various temperatures, to systematically vary its surface characteristics.…”

Recent research advances on catalysts for selective hydrogenation of ethyne

“…In addition to the above-mentioned catalysts, several other catalysts, such as ceria, [142][143][144] Mo 2 N, 21,145 N-doped reduced graphene oxide, 146 palladium sulfide, 147 palladium phosphide, 148 and so on have also been proven active in selective hydrogenation of ethyne. In this section, some typical examples are taken for illustration.…”