Pd particles coated with ZIF-67 (Pd@ZIF-67) was prepared from the self-reduction of palladium acetate. With isopropanol as the solvent, the furfural hydrogenation reaction performances of Pd@ZIF-67 and ZIF-67 heated at...

Owing to the self‐reducing ability of palladium acetate in solutions, an ethanol solution containing Pd0 particles was prepared and coated in‐situ into copper metal–organic framework (Cu‐MOF), forming Pd@Cu‐MOF in a coated structure. The Pd@Cu‐MOF was reduced under N2 or H2 to form carbon‐coated Pd‐Cu@C. The pyrolysis and carbonization of Cu‐MOF and the reduction of Cu2+ were studied. The Cu‐MOF under either N2 or H2 was pyrolyzed and carbonized, but the Cu2+ reduction mechanisms were different. The high‐temperature carbothermic reduction of Cu2+ under N2 produced Cu0, but during low‐temperature reduction under H2, the reducing H2 reduced Cu2+ to Cu0. Furfural hydrogenation experiments showed that compared with H2, the Pd‐Cu@C prepared under N2 reduction displayed higher furfural hydrogenation activity. The catalytic activity of Pd‐Cu@C prepared from in‐situ Pd0 coating was higher than the Pd/Cu@C prepared from the impregnation method. With i‐propanol as the solvent, the catalytic hydrogenation of furfural under H2 consisted of direct catalytic hydrogenation with molecular hydrogen as the hydrogen source and catalytic transfer hydrogenation with i‐propanol as the hydrogen donor. The catalytic activity of direct catalytic hydrogenation is higher than the catalytic transfer hydrogenation.

The −NH2 in UiO‐66‐NH2 was functionally modified with 2‐pyridinecarboxaldehyde to form Schiff base UiO‐66‐Pyr, and hollow nitrogen‐doped porous carbon‐ZrO2 supported Ru (Ru/NC‐ZrO2) was prepared from Ru3+‐coordinated UiO‐66‐Pyr‐Ru. Then the furfural hydrogenation performance of the product was investigated. Compared with single‐tooth‐coordinated UiO‐66‐NH2, the 2‐tooth‐coordinated UiO‐66‐Pyr can improve the stability of Ru3+ coordination and thereby increase the Ru loading and dispersity in the Ru/NC‐ZrO2, showing high furfural hydrogenation activity. The direct hydrogenation with hydrogen as the hydrogen source and the transfer hydrogenation with isopropanol as the hydrogen donor was determined by the furfural hydrogenation of Ru/NC‐ZrO2 under hydrogen or nitrogen.