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Study of Metal Coverage on Alumina from Group‐6 Metal Carbonyl Precursors
Author(s) -
Baibich I. M.,
Stedile F. C.,
Baumvol I. J. R.,
Dos Santos J. H. Z.,
Santarosa V. E.
Publication year - 1995
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221920220
Subject(s) - chemistry , metal , triphenylphosphine , infrared spectroscopy , metal carbonyl , adsorption , ligand (biochemistry) , infrared , group (periodic table) , spectroscopy , crystallography , stereochemistry , polymer chemistry , analytical chemistry (journal) , organic chemistry , catalysis , physics , biochemistry , receptor , optics , quantum mechanics
The metal loading on alumina surfaces from group‐6 metal (Cr, Mo, W) carbonyls and their derivatives is determined by Rutherford backscattering spectroscopy. The subcarbonyl species are generated by photochemical activation and monitored by Fourier transform‐infrared spectroscopy. No chemical adsorption takes place for the three systems studied. Nevertheless, in the presence of the ligand triphenylphosphine (PPh 3 ) and the assistance of UV radiation, surface species chemically bonded to γ‐Al 2 O 3 can be observed, achieving a maximum metal loading of 0.3% in the case of Cr and 0.4% in the case of W. Die metallische Sättigung von Alumina‐Oberflächen mit Metall‐(Cr, Mo, W)‐Carbonylen der Gruppe 6 wird mit RBS bestimmt. Die subcarbonylen Arten werden mit UV‐Strahlung erzeugt. Für die drei Systeme findet keine chemische Adsorption statt. Mit Triphenylphosphin als Ligand werden an der Oberfläche jedoch chemisch gebundene Carbonylarten beobachtet. Die maximale Sättigung beträgt 0.3% für Cr und 0.4% für W.