Abstract
The catalytic oxidation of silanes to produce silanols using water as an oxidant at mild temperatures is a major challenge in Si-H activation. Highly efficient and easy-to-recycle catalysts based on Pd nanoparticles are in high demand. In this study, Pd nanoparticles embedded in an MgO porous overlayer on an Mg plate as a structured catalyst was prepared by the plasma electrolyte oxidation (PEO) technique. The Pd/MgO catalyst is strongly anchored to the MgO plate, building a structured catalyst. Fabrication parameters such as the temperature of the electrolyte and applied voltage significantly influenced the structure of the obtained Pd/MgO catalyst and in turn its catalytic activity. The catalytic activities of Pd/MgO were evaluated by activation of a Si-H bond for catalyzing the aqueous oxidation of silanes to silanol at mild temperatures. The catalytic activity of Pd nanoparticles is favored by their electro-deficient state due to influence from the MgO substrate. The Pd/MgO catalyst exhibits good performance stability during recycling. This work paves the way for fabricating structured catalysts with long-term stability and enhanced metal–oxide interaction.
Highlights
Noble metal nanoparticles dispersed on porous substrates are the dominate form of catalyst used in both fundamental research and industrial reactions [1]
We recently developed a plasma electrolytic oxidation (PEO) based method for fabricating metal nanoparticles (NPs) that are strongly adhered to porous oxide [8]
Pd/MgO catalysts were prepared by micro-arc oxidation of an Mg plate in the electrolyte-containing Pd precursor
Summary
Noble metal nanoparticles dispersed on porous substrates are the dominate form of catalyst used in both fundamental research and industrial reactions [1]. Metals are loaded on the support in most nanocatalysts prepared by conventional solution methods, limiting the metal–support interaction and weakening the metal stability in harsh conditions [7]. To address these problems, we recently developed a plasma electrolytic oxidation (PEO) based method for fabricating metal nanoparticles (NPs) that are strongly adhered to porous oxide [8]. Au NPs obtained by this method are semi-embedded in the oxide and exhibit abnormal thermal stability at relative high temperatures Such a heterostructure constructed on an Mg plate forms a structured catalyst that can be employed for use
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