Single-Atom Alloy Pd–Ag Catalyst for Selective
Hydrogenation of Acrolein
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Abstract
Pd–Ag
alloy catalysts with very dilute amounts of Pd were
synthesized. EXAFS results demonstrated that when the concentration
of Pd was as low as 0.01 wt %, Pd was completely dispersed as isolated
single atoms in Ag nanoparticles. The activity for the hydrogenation
of acrolein was improved by the presence of these isolated Pd atoms
due to the creation of sites with lower activation energy for H<sub>2</sub> dissociation. In addition, for the same particle size, the
0.01% Pd/8% Ag alloy nanoparticles exhibited higher selectivity than
their monometallic counterparts, suggesting that the Pd atom may act
as a site for the favorable bonding of the acrolein molecule for facile
hydrogenation of the aldehyde functionality