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Advisor(s)
Abstract(s)
Platinum and iridium organometallic precursors are used to prepare nanosized, thermally stable multiwalled carbon nanotube-
supported catalysts. The materials are characterized by N2 adsorption at 77 K, temperature-programmed desorption coupled
with mass spectrometry, H2 chemisorption, transmission electron microscopy and thermogravimetric analysis; they are
tested in the selective hydrogenation of cinnamaldehyde to cinnamyl alcohol under mild conditions (363 K and 1 MPa). A thermal activation at 973 K is found to have a very positive effect over both activity and selectivity, leading to selectivities
of approximately 70%, at 50% conversion, regardless of the active metal phase (Pt or Ir). Since no noticeable differences in
the metal particle sizes are detected, the results are interpreted in light of an enhanced metal/support interaction. This effect, induced by the removal of oxygenated surface groups, is thought to change the adsorption mechanism of the cinnamaldehyde
molecule.
Description
Keywords
Aldehydes Hydrogenation Nanotubes Supported catalysts Surface chemistry
Citation
Machado, Bruno; Gomes, Helder; Serp, Philippe; Kalck, Philippe; Faria, Joaquim (2010). Liquid phase hydrogenation of unsaturated aldehydes: enhancing selectivity of MWCNT supported catalysts by thermal activation. ChemCatChem. ISSN 1867-3880. 2, p.190-197
Publisher
Wiley