Catalysis under continuous flow operation is industrially more relevant compared to reactions carried out in batch reactors. But catalysis with metal‐organic frameworks (MOFs) is largely restricted to batch reactions, especially in case of semi hydrogenation reactions. We anchored Pd nanoparticles (NPs) on robust UiO‐66(Hf) MOF to develop effective catalyst for semi hydrogenation of phenylacetylene into styrene. We investigated catalytic performance of Pd/UiO‐66(Hf) in a continuous‐flow liquid‐phase semi‐hydrogenation of phenylacetylene (PA). In this study, Pd/UiO‐66(Hf) catalyst exhibited good catalytic performance with a rare combination of high PA conversion (99.0 %) and high styrene selectivity (90.0 %). Additionally, Pd/UiO‐66(Hf) demonstrated lower deactivation rate in contrast to many reported materials to date. The higher stability of metal NPs over UiO‐66(Hf) aroused from the strong metal‐support interaction (between Brønsted acidic μ3‐OH of MOF and Pd). The Pd/UiO‐66(Hf) retained its catalytic activity even after four recycles.
Metal-organic frameworks (MOFs) are crystalline porous materials composed of metal ions and organic
linkers connected through covalent bonds. To synthesize bimetallic nanoparticles ammonia borane
was used as a reducing agent was used on metal ions contained in MOF-74(Cu, Ni). Monometallic Cu
and Ni nanoparticles were also synthesized from their corresponding MOF-74 materials. The
nanoparticles generated through this methodology were effectively stabilized by the linker of MOF.
These nanoparticles were then employed for the transfer hydrogenation of 4-nitrophenol to
4-aminophenol. Among the 5 different catalysts tested, CuxNi1-x exhibited exceptional catalytic activity
towards 4-nitrophenol reduction within 2 min, indicating a synergistic effect between copper and
nickel in the bimetallic catalyst. Additionally, these catalysts demonstrated good stability and
recyclability up to 5 cycles.
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