Acetylene hydrogenation over structured Au–Pd catalysts. (14th April 2016)

• Record Type: Journal Article
• Authors: McCue, Alan J.; Baker, Richard T.; Anderson, James A.
• Is Part Of: Faraday discussions. Volume 188(2016)
• Page Start: 499
• Page End: 523
• Publication Date: 2016-04-14
• Subjects: Chemistry -- Periodicals; Metallurgy -- Periodicals; Electrochemistry -- Periodicals; 540
• DOI: 10.1039/c5fd00188a
• Languages: English
• ISSNs: 1359-6640

Abstract

Abstract : AuPd nanoparticles were prepared following a methodology designed to produce core–shell structures (an Au core and a Pd shell). Characterisation suggested that slow addition of the shell metal favoured deposition onto the pre-formed core, whereas more rapid addition favoured the formation of a monometallic Pd phase in addition to some nanoparticles with the core–shell morphology. When used for the selective hydrogenation of acetylene, samples that possessed monometallic Pd particles favoured over-hydrogenation to form ethane. A sample prepared by the slow addition of a small amount of Pd resulted in the formation of a core–shell structure but with an incomplete Pd shell layer. This material exhibited a completely different product selectivity with ethylene and oligomers forming as the major products as opposed to ethane. The improved performance was thought to be as a result of the absence of Pd particles, which are capable of forming a Pd-hydride phase, with enhanced oligomer selectivity associated with reaction on uncovered Au atoms.