期刊
CATALYSTS
卷 12, 期 9, 页码 -出版社
MDPI
DOI: 10.3390/catal12090995
关键词
phenol; aqueous-phase; hydrogenation; superhydrophobic carbon; N-doped; Ru cluster
资金
- National Key R&D Program of China [2018YFC1902101]
- National Natural Science Foundation of China [21838006]
In this study, a catalyst of well-dispersed Ru clusters fixed in N-doped mesoporous hollow carbon spheres (Ru@N-CS) was reported for selective hydrogenation of phenol in mild aqueous conditions, leading to enhanced cyclohexanol productivity.
Selective hydrogenations of lignin-derived phenolic compounds represent essential processes in the chemical industry, especially for production of a multitude of fine chemicals. However, selective hydrogenation of phenolic compounds in water phase suffers from low conversion. Here we report a catalyst of well-dispersed Ru clusters fixed in N-doped mesoporous hollow carbon spheres (Ru@N-CS) for enhanced cyclohexanol productivity in phenol hydrogenation at mild aqueous condition. This superhydrophobicity carbon spheres appear to selectively allow diffusion of phenol and hydrogen molecules to the electron-rich coordination unsaturated Ru active sites, while confining the reactants there to enhance its reaction probability. The Ru@N-CS catalyst can selectively hydrogenate phenol at 80 C-o and 0.5 MPa of H-2 in 30 min in aqueous medium with phenol conversions of 100% and similar to 100% cyclohexanol selectivity, corresponding to cyclohexanol productivity up to 471 per g of Ru per minute. The TOF value is up to 9980 h(-1), which 14 times more than Ru nanoparticles supported on N-doped carbon hollow spheres (Ru/N-CS). This work provides an important catalytic system for upgrading of bio-oil into value-added chemicals under mild aqueous-phase.
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