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Particle size determination of palladium supported on sepiolite and aluminum phosphate

AuthorsMartín-Luengo, María Ángeles ; Pajares, J. A.; González Tejuca, L.
Issue DateOct-1985
CitationJournal of Colloid and Interface Science 107(2): 540-546 (1985)
AbstractChemical and physical methods for the determination of the particle size (d) of palladium metal supported on sepiolite and aluminum phosphate were studied. Differences among d values of Pd/sepiolite determined by H2 and O2 adsorption and O2-H2 and H2-O2 titrations were of 16% or lower, which proves that these three methods give a reliable estimate of metal particle sizes in these catalysts. CO adsorption and transmission electron microscopy (TEM) yielded, generally, remarkably higher values. In the case of Pd/AlPO4 catalysts, d values obtained by H2 chemisorption and wide-angle X-ray scattering were in good agreement. However, other methods of chemisorption, titration, and TEM gave noticeably higher d values. Formation of PdnO in Pd/AlPO4 catalysts points to a preferential growth on the support of the (111) and (100) faces of palladium. The observed sequence of sintering of Pd on both supports was H2O > high vacuum > H2.
Publisher version (URL)https://doi.org/10.1016/0021-9797(85)90206-1
Appears in Collections:(ICP) Artículos
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