Abstract
AbstractThe preparation of bimetallic Pd/Ag‐based model catalysts is addressed to study the promotional effects of Ag doping in the liquid‐phase semi‐hydrogenation of diphenylacetylene. The precursor concept is employed where colloidal bimetallic Pd/Ag nanoparticles are initially synthesized and then used as well‐defined building units for catalyst preparation. This approach allows for tuning the composition of the nanoparticles independently with the two metals co‐localized to a fine extent. Size and composition of the nanoparticles are preserved after immobilizing them on a carbon support.
Highlights
The selective catalytic hydrogenation of acetylenic compounds has attracted a lot of interest in fundamental research but is extensively used in fine organic synthesis and various industrial processes [1, 2]
The size of the bimetallic Pd/Ag NPs was in a similar size range (4–5 nm) slightly increasing with increasing amount of Ag
In the XRD patterns, insertion of Ag in the Pd fcc lattice and formation of substitutional alloys was indicated by a shift of the 111 reflection to smaller Bragg angles
Summary
The selective catalytic hydrogenation of acetylenic compounds has attracted a lot of interest in fundamental research but is extensively used in fine organic synthesis and various industrial processes [1, 2]. Modification with Ag is known to hinder the formation of sub-surface hydrogen and PdHx phases typically leading to undesirable over-hydrogenation to the alkane [44] Research on such systems is limited by the poor availability of bimetallic catalytic systems with homogeneous distribution of size, morphology and chemical composition. For the manufacturing of model catalysts in the liquid-phase semi-hydrogenation of diphenylacetylene (DPA), we employ the precursor concept as a promising strategy to address the promotional effects of Ag doping on palladium catalysts [48] In this context, colloidal bimetallic Pd/Ag nanoparticles (NPs) were initially synthesized and used as well-defined building units for catalyst preparation. We show that alloying with Ag increases the selectivity and yield of cis-stilbene (CST) in the liquid-phase hydrogenation of DPA
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
