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Palladium nanoparticles of 2.1 ± 0.9 nm size were generated within a hybrid zirconia/polyvinyl alcohol membrane of 60 ± 5 μm thickness, to afford a bulk 6.7% Pd loading (w/w). The material was used as catalyst for the heterogeneous, batch and continuous flow partial oxidation reaction of functionalized alcohols, using air or oxygen as oxidants and water or methanol as solvents. Good selectivity to the corresponding aldehydes at full conversion and excellent resistance over prolonged time-on-stream under very mild reaction conditions was observed. No metal leaching in solution was detected, as well as no additives nor regeneration steps were needed. [ABSTRACT FROM AUTHOR]

Palladium nanoparticles of 3.2 ± 0.9 nm size were generated within 12–18 mesh pellets of hybrid zirconia/polyvinyl alcohol matrix, to afford a 0.03–0.1% Pd loading (w/w). The material was used in the catalytic, continuous flow hydrogenation reaction of multiple C C and C C bonds and nitrobenzene, showing good selectivity at full conversion and excellent resistance over prolonged time-on-stream under room temperature and 1–2 bar H 2 gas. No metal leaching in solution was detected as well as no additives nor regeneration steps were needed for use in hydrophilic solvents. [ABSTRACT FROM AUTHOR]

Highlights: [•] Palladium nanoparticles immobilized onto an unconventional borate macroporous monolith. [•] Liquid-phase catalytic semi-hydrogenation reaction of substituted alkynes under continuous flow. [•] Excellent efficiency and long-term stability under mild reaction conditions. [•] No need of additives. [•] Selectivity comparable to that of the batch industrial processes. [ABSTRACT FROM AUTHOR]

Highlights: [•] Hybrid zirconia/polyvinyl alcohol catalytic membrane containing Pd nanoparticles. [•] Partial hydrogenation reactions in the liquid phase of multiple C C and C C bonds. [•] Efficient under mild reaction conditions. [•] No metal leaching, reusable, stable, use of hydrophilic solvents, no need of regeneration. [Copyright &y& Elsevier]

The article studies catalyst recovery and recycling of ion exchange resins. It focuses on ion-exchange resins and homogeneous catalysts immobilization and involves the application of processes including carbonylations, hydroformylations and hydrogenations. Other processes involved include asymmetric hyrogenations, polymerizations and oxidations. Details about research results and methodologies are cited.