Electrocatalytic hydrogenation of lignin monomer to methoxy-cyclohexanes with high faradaic efficiency

Abstract

Developing efficient renewable electrocatalytic processes for chemical manufacture is of commercial interest, especially from the biomass-derived feedstock. Selective electrocatalytic hydrogenation (ECH) of biomass-derived lignin monomers to high-value oxygen-functional compounds is...

Lignin to value-added chemicals and advanced materials: extraction, degradation, and functionalization

“…The ternary carbon-felt supported RhPtRu electrocatalysts were prepared for the electrocatalytic hydrogenation of lignin monomer guaiacol. 114 At a current density of 50 mA cm −2 , 2-methoxycyclohexanol and 2-methoxycyclohexanone were obtained with the selectivity of 62.0% and 29.1%, respectively. Moreover, the Faraday efficiency was 62.8%.…”

Electrocatalysis as an efficient alternative to thermal catalysis over PtRu bimetallic catalysts for hydrogenation of benzoic acid derivatives

“…Typically, bimetallic PtRu catalysts were synthesized by co-electrodeposition onto CP in a three-electrode system (Scheme 1). 11,16,18 The setup of electrodes was the same as above. Electrodeposition was performed by CV, which was subjected to a range of potentials between −0.5 and 1.7 V at a scan rate of 0.1 V s −1 for 20 cycles.…”

“…In contrast to the TCH process, electrocatalytic hydrogenation (ECH) has drawn extensive research interest, [10][11][12][13][14] which is powered by electricity generated from renewable energy, such as solar and wind power, and achieves the shift from a harsh process to an atmospheric-pressure and room-temperature conversion, thereby meeting the requirements of sustainable energy production. [15][16][17][18] Furthermore, aqueous feedstocks are typically adopted as the source of hydrogen, generating oxidative or reducing equivalents without wasteful, potentially toxic reagents. [19][20][21] Nevertheless, there are still problems and improvements in the hydrogenation conversion of benzoic acid to cyclohexanecarboxylic acid by electrochemical techniques.…”

Synergistic Roles of the CoO/Co Heterostructure and Pt Single Atoms for High-Efficiency Electrocatalytic Hydrogenation of Lignin-Derived Bio-Oils

“…But they are more resistant to hydrogenation with low conversion and Faradaic efficiency (FE) compared to other bio-oil components, such as aldehydes and ketones, due to the highly delocalized π electron of aromatic rings . Thus, the ECH of phenolic compounds has almost exclusively used platinum-group metal catalysts due to their high electrochemical hydrogenation activity for aromatic rings, such as Pt/C, , Ru/C, Rh/C, Pd/C, PtAuRh, and RhPtRu . Nevertheless, platinum-group metals have the characteristics of resource shortage and high cost, which is not conducive to the large-scale application of biomass upgrading.…”

“…7 Thus, the ECH of phenolic compounds has almost exclusively used platinum-group metal catalysts due to their high electrochemical hydrogenation activity for aromatic rings, such as Pt/C, 8,9 Ru/C, 10 Rh/C, 11 Pd/C, 12 PtAuRh, 13 and RhPtRu. 14 Nevertheless, platinum-group metals have the characteristics of resource shortage and high cost, which is not conducive to the large-scale application of biomass upgrading. Single atom catalysts (SACs) offer promising candidates to reduce the dosage of precious metals with theoretically maximum atomic utilization while maintaining their catalytic performance due to the unsaturated coordination and more dense active sites.…”