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Preparation and characterization of alumina supported Pd-W and Pd-Mo catalysts photogenerated from group VI metal carbonyls by A.M. Sica; I.M. Baibich; C.E. Gigola is a Chemistry article available to read on EtoBox.

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Tungsten and molybdenum were introduced in ␥-Al 2 O 3 and Pd/␥-Al 2 O 3 using metalcarbonyls [W(CO) 6 and Mo(CO) 6 ] photoactivation. DRIFTS FT-IR spectra of the surfaces prior to thermal decomposition reveal the presence of unstable metalsubcarbonyl species, in contrast with the ones found previously, when the photoactivation was performed in the presence of triphenylphosphine. The ν(CO) band intensities did not reflect the tungsten and molybdenum uptakes determined by AAS, the loadings being higher in the presence of palladium. After thermal treatment, the catalysts were further characterized by hydrogen chemisorption and FT-IR spectra of adsorbed CO and NO. The results showed that a reaction between the hexacarbonyls and the supported palladium particles takes place leading to bimetallic catalysts, with clear palladium-tungsten and palladium-molybdenum interactions. Pd + Mo(CO) 6 ⇒ uv Pd + Mo(CO) 6-x ⇒ Pd-Mo(CO) 6-x ⇒ uv Pd-Mo. Both group VI metals strongly modify the chemisorption properties of palladium, while molybdenum seems to be present in a reduced state in close association with palladium.

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Author

A.M. Sica; I.M. Baibich; C.E. Gigola

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 1381-1169)

Published

2003

Language

EN

Field

Chemistry (Physical Sciences)