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Journal Article

Palladium-platinum powder catalysts manufactured by colloid synthesis I. Preparation and characterization

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Teschner,  Detre
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Wild,  Ute
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Schlögl,  Robert
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Veisz, B., Tóth, L., Teschner, D., Paál, Z., Győrffy, N., Wild, U., et al. (2005). Palladium-platinum powder catalysts manufactured by colloid synthesis I. Preparation and characterization. Journal of Molecular Catalysis A, 238(1-2), 56-62. doi:10.1016/j.molcata.2005.04.064.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-0A45-A
Abstract
Palladium, platinum and PdPt bimetallic colloidal particles were prepared in atomic ratios of 4:1, 1:1 and 1:4 by the reduction of K2PdCl4 and/orK2PtCl4 in the presence of cationic surfactant, tetradecyltrimethylammonium bromide (C14TABr). The nanoparticles in the “as prepared” state were characterized by TEM, EDS and XPS, UPS, permitting to determine their mean particle size, bulk and surface composition. The bulk composition of the bimetallic samples determined by EDS was close to their nominal value, while XPS indicated Pt enrichment near to the surface. All samples in the “as received” state contained surface oxide impurity and contained carbon impurities. The monometallic
samples contained considerably more C as the bimetallic ones. A quasi-in situ H2 treatment at 473K in the electron spectrometer resulted in cleaner metals, containing less carbon and oxygen, as shown by XPS and UPS.