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Palladium has been used as a catalyst not only in Suzuki and Heck cross coupling reaction in organic chemistry, but also in automobile industry for the reduction of vehicle exhausts. The catalytic activity of Pd nanoparticles depends strongly on their size and exposed crystalline facets. In this study, the single crystalline palladium nanocubes/nanorods were prepared in the presence of polyvinyl pyrrolidone (PVP) and potassium bromide (KBr) using the polyol method. Selected area diffraction pattern and high-resolution transmission electron microscopy (TEM) were performed by TEM. The result shows that the ratio of KBr/PVP is the key factor to determine whether the product is cubes or rods. The as-prepared Pd nanocubes were highly uniform in both size and shape. The ordered packing structures including monolayer and multilayer can be fabricated via the rate-controlled evaporation of solution solvent. The catalytic activity of these Pd nanocubes towards heck reaction of iodobenzene with acrylate or acrylic acid was found to be higher than that of Pd nanorods. We suspect it is caused by the difference of energy state while Pd nanocubes is {100} plane and nanorods is {111} plane.
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참고문헌 (16)
참고문헌 신청
Baldauf M / 1996 / Formic acid oxidation on ultrathin Pd fi lms on Au(hkl)and Pt(hkl)electrodes / J. Phys. Chem 100:11375~11381
Burda C / 2005 / Chemistry and properties of nanocrystals of different shapes / Chem. Rev 105:1025~1102
Hoshi N / 2006 / Structural effects of electrochemical oxidation of formic acid on single crystal electrodes of palladium / J. Phys. Chem. B 110:12480~12484
Jin M S / 2011 / Synthesis of Pd nanocrystals enclosed by {100} facets and with sizes <10 nm for application in CO oxidation / Nano Res 4:83~91
Kim S W / 2002 / Fabrication of hollow palladium spheres and their successful application to the recyclable heterogeneous catalyst for suzuki coupling reactions / J. Am. Chem. Soc 124:7642~7643
Burda C / 2005 / Chemistry and properties of nanocrystals of different shapes / Chem. Rev 105:1025~1102
Hoshi N / 2006 / Structural effects of electrochemical oxidation of formic acid on single crystal electrodes of palladium / J. Phys. Chem. B 110:12480~12484
Jin M S / 2011 / Synthesis of Pd nanocrystals enclosed by {100} facets and with sizes <10 nm for application in CO oxidation / Nano Res 4:83~91
Kim S W / 2002 / Fabrication of hollow palladium spheres and their successful application to the recyclable heterogeneous catalyst for suzuki coupling reactions / J. Am. Chem. Soc 124:7642~7643
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