Supported gold–nickel nano-alloy as a highly efficient catalyst in levulinic acid hydrogenation with formic acid as an internal hydrogen source

Abstract

The surface Au–Ni nano-alloy was very efficiently used for the first time for the hydrogenation of levulinic acid with formic acid as an internal hydrogen source.

Mussel-inspired immobilization of Au on bare and graphene-wrapped Ni nanoparticles toward highly efficient and easily recyclable catalysts

“…Being a noble metal, desorption on AuNP surface is stabilizing and hydrogen is less strongly chemisorbed on AuNP surface making the hydrogenation reaction faster. 43,44 Moreover, Au atoms were reported to induce electronic effects on d electrons of Ni similar to the Au@Ni core-shell alloys 14,36 where catalytic reactivity depends on the combined electronic effect of two metal components. It was further concluded that Au atoms in the core of the Au@NiNPs induced an electronic effect on the local density of Ni d states via the presence of core Au atoms.…”

Heterogeneous Catalytic Hydrogenation of Levulinic Acid to γ‐Valerolactone with Formic Acid as Internal Hydrogen Source

“…In addition to Ag, another precious metal, Au, was also reported to serve as the doping metal with excellent properties for enhancing the activity of Ni‐based bimetallic catalysts used in the FA/LA catalytic system. Ni‐based catalysts doped with a small amount of Au have been developed as efficient bimetallic catalysts for the conversion of the FA/LA system (5 wt % total metal content, Au/Ni ratio of 1:4) . The Au‐Ni bimetallic catalysts were found to exhibit high activity owing to the formation of bimetallic alloys, which was strongly influenced by the preparation methods.…”

“…ii) Bimetallic catalysts have shown advantages in improving catalytic activity and stability in biomass upgrading processes, and have promising application prospects for the FA/LA catalytic system (see Section 3.1.3) . Also, compared with pure precious metal catalysts, the bimetallic catalysts with a combination of precious and nonprecious metals could potentially reduce the preparation costs.…”

Synthesis of small Ni-core–Au-shell catalytic nanoparticles on TiO2by galvanic replacement reaction

“…These catalytic results suggest that Au and Ni are closely interacting, as it is further elaborated in the discussion part. To Table 2 Temperature and selectivities to products at 100% conversion of butadiene over Au (10) emphasize this point, a previous result from our group 8 showed that a mechanical mixture (50-50% in catalyst weigh) of monometallic Au/TiO 2 (1 wt%) and Ni/TiO 2 (0.2 wt%), i.e., corresponding to an Au/Ni atomic ratio of 1.7, exhibited the same catalytic behavior (activity and selectivity) as the monometallic Ni/TiO 2 sample. These results also suggest that to understand how the catalytic properties are modied by the addition of gold, the metal particle microstructure must be known.…”