柠檬醛
催化作用
选择性
香茅醛
醛
纳米颗粒
双金属片
化学
离解(化学)
肉桂醇
合金
金属
铂金
氢
过渡金属
无机化学
材料科学
化学工程
有机化学
纳米技术
色谱法
工程类
精油
作者
Madelyn R. Ball,Laura Proaño,Iman Nezam,Dong‐Chan Lee,Faisal M. Alamgir,Christopher W. Jones
出处
期刊:Chemcatchem
[Wiley]
日期:2023-02-14
卷期号:15 (5)
被引量:1
标识
DOI:10.1002/cctc.202201396
摘要
Abstract Dilute alloy CuPt and NiPt catalysts are studied in the hydrogenation of citral, a model α,β‐unsaturated aldehyde. In situ and ex situ characterization is used to demonstrate that the Pt species within these nanoparticles are well dispersed and approach a single atom alloy structure. The distribution of Pt varies between the two host metal systems; under a hydrogen environment, the nanoparticle surface and near‐surface region of the NiPt nanoparticles is Pt rich, while the Pt is more uniformly distributed throughout the CuPt nanoparticles. When used for citral hydrogenation reactions, a rate enhancement is observed upon the addition of Pt to the Cu or Ni host catalysts, however this enhancement is determined to be due to the presence of additional metal and not a synergistic effect of the two metals. The Pt structure does, nonetheless, influence the observed selectivity trends. NiPt/SiO 2 catalysts have high selectivity to the unsaturated aldehyde citronellal while the CuPt/SiO 2 catalysts have increased selectivity to unsaturated alcohol products. This increased selectivity is attributed to a combination of hydrogen dissociation over Pt sites and a decrease in size of Cu ensembles due to the presence of Pt, which favors binding and hydrogenation of C=O rather than C=C bonds.
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