Pd(II) loaded on diamine functionalized LDH for oxidation of primary alcohol using water as solvent
•Pd(II) loaded on diamine enabled LDH to function as catalyst precursor.•Oxidation of alcohols using molecular oxygen as oxidant and water as solvent.•The present catalyst Pd(II)–LDH has been shown to possess remarkable catalytic activity.•Avoidance of organic solvents offer a real alternative to reaction protocol.
Hybrid inorganic–organic materials which comprise organic functional groups tethered from layered double hydroxide surfaces are versatile, heterogeneous catalysts. This functional group can bind with palladium that provides catalytic activity superior to what can be obtained from homogeneous catalysts. This work reports synthesis of heterogeneous and recyclable Pd(II) (supported on diamine functionalized layered double hydroxide) catalyst for oxidation of primary alcohol using water as solvent and molecular O2 as a terminal oxidant. The organometallic-derived catalyst has been studied by XRD, FTIR, UV–vis DRS, solid-state NMR (13C, 29Si), XPS, TGDTA, SEM and EDX. Here the ligand N-[3-(trimethoxysilyl)-propyl] ethylenediamine (TPED) is covalently attached to the surface of LDH, which is shown by NMR spectroscopy. XPS results strongly suggest that it involves the formation of NPd coordination bonds. EDX confirmed that all the elements were present in the LDH/Pd(II) complex. The heterogeneous catalyst can be easily recovered and reused multiple times without significant loss of catalytic activity and selectivity, which is a better green alternative for practical applications.
Graphical abstractLDH/Pd(II) has been found to be an efficient catalyst for aerobic oxidation of alcohols by using water as solvent to achieve greener and most sustainable pathway.Figure optionsDownload full-size imageDownload high-quality image (212 K)Download as PowerPoint slide
Journal: Applied Catalysis A: General - Volumes 460–461, 10 June 2013, Pages 36–45