During biomass constituent conversion, solvent choice often plays a critical role in determining product selectivity and reaction pathways. However, the role of the solvent remains poorly understood. In this study, the role of the solvent in furfural (FFA) conversion over a Co/CoO_x catalyst supported on N-doped carbon nanotubes (Co/CoO_x @N-CNTs) was investigated. In water, cyclopentanone (CPO)/cyclopentanol was produced with high selectivity via Piancatelli rearrangement. In ethanol, tetrahydrofurfuryl alcohol (THFOL) synthesized via furan ring saturation was the major product. The presence of Brønsted acid sites (BASs) in water and the participation of four hydrogen atoms from water molecules promoted FFA conversion via the CPO pathway. By contrast, the absence of BASs in ethanol and the participation of three hydrogen atoms from ethanol molecules resulted in the THFOL pathway being dominant. Furthermore, both thermodynamic properties and oxygen vacancies were found to affect FFA conversion.

在生物质成分转化过程中，溶剂选择通常在确定产品选择性和反应途径方面发挥关键作用。然而，溶剂的作用仍然知之甚少。在这项研究中，溶剂在糠醛 (FFA) 转化中的作用在负载在 N 掺杂碳纳米管 (Co/CoO _{x ) 上的 Co/CoO x催化剂上}@N-CNTs) 进行了调查。在水中，通过 Piancatelli 重排以高选择性生产环戊酮 (CPO)/环戊醇。在乙醇中，通过呋喃环饱和合成的四氢糠醇（THFOL）是主要产物。水中布朗斯台德酸位点 (BAS) 的存在以及水分子中四个氢原子的参与促进了 FFA 通过 CPO 途径的转化。相比之下，乙醇中不存在 BAS 以及乙醇分子中三个氢原子的参与导致 THFOL 途径占主导地位。此外，发现热力学性质和氧空位都会影响 FFA 转化率。