Rationally modulating the catalytic microenvironment is important for targeted induction of specific molecular behaviors to fulfill complicated catalytic purposes. Herein, a metal pre‐chelating assisted assembly strategy is developed to facilely synthesize the hollow carbon spheres with ultrafine ruthenium clusters embedded in pore channels of the carbon shell (Ru@Shell‐HCSs), which can be employed as nanoreactors with preferred electronic and geometric catalytic microenvironments for the efficient tandem hydrogenation of biomass‐derived furfural toward 2‐methylfuran. The channel‐embedding structure is proved to confer the ultrafine ruthenium clusters with an electron‐deficient property via a reinforced interfacial charge transfer mechanism, which prompts the hydrogenolysis of intermediate furfuryl alcohol during the tandem reaction, thus resulting in an enhanced 2‐methylfuran generation. Meanwhile, lengthening the shell pore channel can offer reactant molecules with a prolonged diffusion path, and correspondingly a longer retention time in the channel, thereafter delivering an accelerated tandem hydrogenation progression. This paper aims to present a classic case that emphasizes the critical role of precisely controlling the catalytic microenvironment of the metal‐loaded hollow nanoreactors in coping with the arduous challenges from multifunctional catalyst‐driven complex tandem reactions.
The Cover Feature shows the critical role of solvent system in prompting the tandem conversion of cellulose and its monosaccharides towards 5‐hydroxymethylfurfural, an important biomass‐based platform molecule. The proposed perspectives indicate that the solvent system can be intimately interacted with the substrate, catalyst and product, thereby contributing to the substrate conversion (conversion of cellulose and its monosaccharides), reaction regulation (reaction activity and selectivity regulation) and product acquisition (humus formation inhibition and product purification). More information can be found in the Review by H. Wu et al.
The Cover Feature shows the alloy‐driven electrocatalytic oxidation system of biomass‐derived 5‐hydroxymethylfurfural towards 2,5‐furandicarboxylic acid. The modulation strategies on alloy electronic and geometric structure, as well as the potential effects of external electrocatalytic conditions, have been elaborated for enhancing the electrocatalytic oxidation performance. More information can be found in the Review by M. Guo et al.
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