Using supported Au nanoparticles as starting material for preparing uniform Au/Pd bimetallic catalysts

摘要: One of the best methods for producing bulk homogeneous (composition) supported bimetallic AuPd clusters involves immobilization a protected Au seed followed by addition Pd. This paper investigates importance this gold in controlling resulting structures, sizes and catalytic activities investigating three different seeds. Uniform Au–Pd alloy were obtained when steric/electrostatic protecting group, poly(vinyl alcohol) (PVA), was used to form on activated carbon (AC). In contrast Au/AC precursors prepared using nanoparticles with only electrostatic stabilization (tetrakis(hydroxypropyl)phosphonium chloride (THPC)), or no (magnetron sputtering) produced inhomogeneous alloys segregation palladium. The uniform alloyed catalyst (Pd@AuPVA/AC) is most active selective catalyst, while inhomogenous catalysts are less selective. Further study PVA revealed that amount also critical preparation their stability, activity.