Room temperature chemical deposition of palladium nanoparticles in anodic aluminium oxide templates
2006; IOP Publishing; Volume: 17; Issue: 5 Linguagem: Inglês
10.1088/0957-4484/17/5/049
ISSN1361-6528
AutoresKrisztián Kordás, Géza Tóth, J. Levoska, Mika Huuhtanen, Riitta L. Keiski, Matti Härkönen, Thomas F. George, Jouko Vähäkangas,
Tópico(s)Corrosion Behavior and Inhibition
ResumoPalladium nanoparticles are deposited in the pores of freestanding, mesoporous anodic aluminium oxide (AAO) templates via a chemical route at room temperature. In the precursor, Pd2+ ions are complexed with ammonia and reduced to Pd0 by adding an excess amount of formaldehyde. To enhance the infiltration of pores with the precursor, 2-propanol is added to the solution. After a few hours of plating at room temperature, crystalline Pd0 nanoparticles with an average size of ~4 nm form on the pore walls of the AAO templates. The effect of heat treatment on the structure of the AAO/Pd system is also studied. The specimens are investigated using FESEM, EFTEM/EDX, and electron and x-ray diffraction techniques. Preliminary catalyst activity analyses reveal good selectivity of ~90%, but low conversion of ~1.2% of carbon monoxide to methane in hydrogen flow at 330 °C on AAO/Pd. The oxidized form of the catalyst shows instantaneous oxidation with ~100% selectivity and conversion of carbon monoxide to carbon dioxide in oxygen flow at 140 °C.
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