Abstract
We report the synthesis of equimolar Pd–Ru alloy nanoparticles (NPs) incorporated mesoporous alumina films (Pd–Ru/MAF) by the sol–gel route. The synthetic strategy involves homogeneous mixing of the Pd2+ and Ru3+ ions in the alumina sol containing P123 micelles. Dip-coated films, prepared on ordinary glass substrates, were thermally reduced at a relatively lower temperature (500 °C) to generate equimolar Pd–Ru/MAF with a nominal molar composition of Pd:Ru:AlO1.5 = 2:2:96. Electron microscopy studies revealed uniformly distributed Pd–Ru alloy NPs in a mesoporous alumina–alumina sphere composite film matrix. The P123/alumina nanocomposite acted as an excellent breeding medium to form Pd–Ru (∼1:1) alloy NPs despite the poor miscibility of the two metals. Pd–Ru/MAF showed excellent catalytic performances with highest normalized rate constant values (5.43 × 1014 min–1 mol–2) and possessed good reusability compared to the corresponding monometallic analogues in the reduction of aqueous 4-nitrophenol in the pres...
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