The hydrogenation of carbon monoxide over rhodium oxide surfaces

Abstract

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CO Hydrogenation to C2-oxygenates over Rh–Mn–Li/SiO2 Catalyst: Effects of Support Pretreatment with nC1–C5 Alcohols

“…Rh 0 , is the active sites for CO dissociation, while partially oxidized Rh, i.e. Rh + , is more favorable active sites for CO insertion to form intermediates of C 2 -oxygenates [9][10][11]. As discussed above, the support pretreatment with nC 1 -C 5 alcohols increased the Rh dispersion and the ratio of Rh + / Rh 0 sites, thereby increasing the number of active sites, especially the active sites for CO insertion.…”

Organometallic Models for Metal Surface Reactions: Chain Growth Involving Electrophilic Methylidynes in the Fischer–Tropsch Reaction

“…Thus, while nickel on alumina is a methanation-only catalyst, on titania it was found to give alkanes and less methane. Watson and Somorjai showed that less methane and more C C2 hydrocarbons were formed on oxidised rhodium catalysts than on the clean metal surface [32,33].…”

Different Mechanisms for the Formation of Acetaldehyde and Ethanol on the Rh–Based Catalysts

“…However, the possibility that Rh + plays a role in CO insertion to form C 2 -oxygenates cannot be ruled out completely. There are reports (18,19) in which Rh + was considered as active sites for the formation of C 2 -oxygenates. The different results obtained in XPS experiments might be due to different catalyst preparation methods, different composition of the catalysts, and different pretreatment of the catalysts.…”