Photocatalytic transfer hydrogenolysis of aryl ethers

Abstract

Aryl ethers greatly influence lignin depolymerization and the oxygen content in lignin products. Cleaving aryl ethers normally requires harsh conditions such as high-pressure hydrogen gas and elevated temperature. Herein, we...

Advancing sustainable lignin valorisation: utilizing Z-scheme photocatalysts for efficient hydrogenolysis of lignin's β-O-4, α-O-4, and 4-O-5 linkages under ambient conditions

“…16–24 In contrast, our catalytic system demonstrated the selective production of aromatic and aliphatic ring-reduced products through photocatalytic hydrogenolysis at room temperature, marking a pioneering achievement in the field. While previous reports for 4-O-5 cleavage relied on methods such as employing 4%Pt(P25)@TiO 2 under UV light and with the assistance of strong acid HCl (1.2 equivalents) for cleaving 4-O-5 linkages, 28 our study stands out as the first to achieve photocatalytic cleavage of this elusive linkage at room temperature without any additives, aligning perfectly with the principles of green chemistry. Furthermore, we demonstrated the photocatalytic valorization of a mixture of α-O-4, β-O-4, and 4-O-5 in producing liquid fuels, which is not reported under photocatalytic conditions.…”

“…To date, there exists a solitary report on the cleavage of 4-O-5 linkages via the photocatalytic pathway employing 4%Pt(P25)@TiO 2 , which necessitates the assistance of the strong acid HCl (1.2 equivalent) for the reaction and is exclusively active under UV light. 28 To our knowledge, no report explores all three linkages within a singular photocatalytic system.…”

Revolutionizing lignin photovalorization: recent advances in TiO2-based materials and beyond in pursuit of optimal solutions for a sustainable future

“…Therefore, lignin conversion to high-value-added products is getting more and more harder. [24][25][26][27][28] Hence nowadays well-established commercial lignins like alkali and Kra lignins and some lignin monomers like PP-ol, PP-one etc. (Fig.…”

Thermal, photonic, and electrocatalysis in lignin depolymerization research

“…This method enables the hydrogenolysis of diphenyl ether (DPE) using alcohol as a hydrogen donor at room temperature. 24 In this process, weakly coordinated Pt 0 atoms and positively charged Pt species on the catalyst surface, when exposed to light irradiation, enhance surface electron availability and store more hydrogen species. This unique property is pivotal for efficient photocatalytic hydrogen transfer.…”