Mechanistic insights on Ru nanoparticle in situ formation during hydrodeoxygenation of lignin-derived substances to hydrocarbons

Abstract

We present the conversion of guaiacol and diphenyl ether (DPhE) with ~100 % selectivity towards hydrocarbons over a ruthenium oxide containing catalyst on micro-mesoporous support (ZM). To elucidate the structure–catalytic...

Sustainable Production of Chemicals via Hydrotreating of CO2 and Biomass Derived Molecules Using Heterogeneous Noble Metal Oxide Catalysts

“…In our previous study we demonstrated that the adsorption of guaiacol and its hydrogenated products was preferable in the case of RuO 2 catalyst comparing to Ru catalyst [93] . In the in situ DRIFT experiments conducted during the hydrogenation of guaiacol, it was observed that the adsorption of the oxygen‐containing substrate was consistently higher in the presence of the RuO 2 catalyst.…”

“…Secondly, the TPR technique implies the continuous temperature rising which is not the case of typical hydroprocesses. In our previous studies, we demonstrated that the guaiacol hydrogenation using RuO 2 supported catalyst started exactly with the phase transition RuO 2 →Ru and it seemed that Ru phase was the only active phase [40] . Nevertheless, the activity of RuO 2 supported catalyst was higher than the activity of reduced ones due to the more favorable adsorption of guaiacol.…”

“…In our previous study we demonstrated that the supported RuO 2 catalyst can be successfully used in the hydrogenation of guaiacol in hydrocarbons solutions. [40] During the process, the oxidized phase was gradually reduced to metallic phase. The operando reaction control allowed to detect that the beginning of hydrogenation reaction coincided with the phase transition RuO 2 !Ru (Figure 8).…”

“…Many studies have demonstrated the excellence of Ru‐contained catalysts over zeolites, mesoporous materials and carbons in aqueous phase hydrogenation reactions of the platform molecules. The selectivity towards desired products was higher in the case of ruthenium catalysts [93,137,138] . The exceptional hydrogenative activity of Ru‐catalysts in aqueous phase has been known for a long time [118,21] .…”

“…In our previous studies, we demonstrated that the guaiacol hydrogenation using RuO 2 supported catalyst started exactly with the phase transition RuO 2 !Ru and it seemed that Ru phase was the only active phase. [40] Nevertheless, the activity of RuO 2 supported catalyst was higher than the activity of reduced ones due to the more favorable adsorption of guaiacol. Is it the only reason for the noble metal oxide advantage?…”