Catalytic Activity of Ti‐based MXenes for the Hydrogenation of Furfural. Issue 22 (8th October 2020)

• Record Type: Journal Article
• Authors: Naguib, Michael; Tang, Wenjie; Browning, Katie L.; Veith, Gabriel M.; Maliekkal, Vineet; Neurock, Matthew; Villa, Alberto
• Is Part Of: ChemCatChem. Volume 12:Issue 22(2020)
• Page Start: 5733
• Page End: 5742
• Publication Date: 2020-10-08
• Subjects: Catalysis -- Periodicals; 541.39505
• DOI: 10.1002/cctc.202000977
• Languages: English
• ISSNs: 1867-3880

Abstract

Abstract: Herein we report on the catalytic activity of Ti‐based MXenes (Ti3 CNTz and Ti3 C2 Tz ) for biomass transformation. MXenes were found to be active catalysts for the hydrogenation of furfural using either gaseous hydrogen or 2‐propanol as solvent and hydrogen source. Both catalysts showed good activity in the conversion of furfural to furfuryl alcohol, with furfuryl ether as the main by‐product. Stability tests indicated that Ti3 CNTz is more stable than Ti3 C2 Tz against deactivation. Ab initio calculations were used to examine the hydrogenation and etherification reactions pathways and their corresponding reaction energetics on the Ti3 CNTz MXene. The results indicate that the hydrogenation of the carbonyl bond efficiently proceeds via the heterolytic activation of hydrogen over the metal‐oxygen site pair followed by the addition of the proton and hydride to the C and O atoms of the carbonyl. The subsequent hydrogenation of the unsaturated furan ring via metal bound hydrogen, however, is calculated to be much more difficult. Protons bound to the oxygen of the MXene are acidic and can also catalyze the etherification of the resulting alcohols. The bifunctional acid‐metal site pairs also selectively catalyze the hydrogenolysis of the furfuryl alcohol to form 2‐methyl furan. Abstract : Biomass conversion : Both titanium carbides and carbonitrides MXenes catalyzed the conversion of furfural into furfural alcohol by hydrogenation with catalytic activities of 145 and 126 mmolfurfural gcatalyst −1 h −1, respectively. The carbonitride showed better catalytic stability combined with no swelling in the d ‐spacing compared to their carbide counterparts. Ab initio calculations were used to explore the reaction pathway on the surface of MXene. The findings of this study suggest exploring MXenes catalysts for biomass conversions.