Abstract
Palladium and palladium–silver catalysts, supported on γ-alumina, were prepared by precipitation in a liquid polyol and characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The catalysts were tested in the hydrogenation of hexa-1,5-diene in liquid phase, at 313 K. The addition of silver improved the hex-1-ene fractional selectivity in all cases, but lowered the catalyst activity when the Pd/Ag ratio was about unity. On the other hand a palladium-rich (Pd/Ag=4) bimetallic catalyst exhibited a very good activity and a good selectivity to hex-1-ene as well. The effects of silver addition are ascribed to the dilution of palladium atoms by silver atoms, which prevents the isomerisation of hexa-1,5-diene. Hence, the polyol method, which has been used up to now to prepare metal powders with controlled morphology, appears of interest in the elaboration of supported metal catalysts.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.