| 内容提要: |
In the catalytic valorization roadmap of biomass resources, the metal-catalyzed hydrogenation of biomass-derived platform chemicals has occupied a key position to prompt the upgrading of lignocellulosic biomass into high-value chemicals and long-chain alkane biofuels. To date, the regulation of the reactivity, selectivity, and stability of metal catalysts is still regarded as a core concern to improve the hydrogenation performance of these biomass-derived molecules. Metal-loaded hollow carbon nanostructures, hereinafter referred to as MHC nanoreactors, had exhibited superior features for heterogeneous catalysis applications over the past decade. The fascinating beauty of MHC nanoreactors largely lies in the fact that a tailorable microenvironment could be conferred via specifically modulating their structural parameters at a nanoscale, through which the interaction between active species and reactant molecules could be selectively enhanced, mitigated, or even eliminated. Among those contributing effects facilitating a microenvironment improvement of MHC nanoreactors, the void-confinement effect is typically regarded as one of the most fundamental and essential effects. However, although the enhancement of catalytic performance prompted by this void-confinement effect has already been confirmed in most experimental efforts, the void-confinement effect is still considered as an experimental phenomenon that has not been clearly interpreted. In this context, our investigation aims to present an explicit recognition into the void-confinement effect of MHC nanoreactors with a critical biomass hydrogenation process, i.e., the LA hydrogenation into GVL, as the probe reaction. |