Immobilization of Gold‐on‐Carbon Catalysts Onto Perfluorocarbon Emulsion Droplets to Promote Oxygen Delivery in Aqueous Phase D‐Glucose Oxidation,ChemCatChem

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Immobilization of Gold‐on‐Carbon Catalysts Onto Perfluorocarbon Emulsion Droplets to Promote Oxygen Delivery in Aqueous Phase D‐Glucose Oxidation
ChemCatChem ( IF 3.8 ) Pub Date : 2020-11-10 , DOI: 10.1002/cctc.202001590
Milena Perovic ₁ , Lukas Zeininger ₁ , Martin Oschatz _{1,

2}

Affiliation

The catalytic activity of metal nanoparticles (NPs) supported on porous supports can be controlled by various factors, such as NPs size, shape, or dispersivity, as well as their interaction with the support or the properties of the support material itself. However, these intrinsic properties are not solely responsible for the catalytic behavior of the overall reaction system, as the local environment and surface coverage of the catalyst with reactants, products, intermediates and other invloved species often play a crucial role in catalytic processes as well. Their contribution can be particularly critical in liquid‐phase reactions with gaseous reactants that often suffer from low solubiltiy. One example is _D‐glucose oxidation with molecular oxygen over gold nanoparticles supported on porous carbons. The possibility to promote oxygen delivery in such aqueous phase oxidation reactions via the immobilization of heterogenous catalysts onto the interface of perfluorocarbon emulsion droplets is reported here. Gold‐on‐carbon catalyst particles can stabilize perfluorocarbon droplets in the aqueous phase and the local concentration of the oxidant in the surroundings of the gold nanoparticles accelerates the rate‐limiting step of the reaction. Consequently, the reaction rate of a system with the optimal volume fraction of fluorocarbon is higher than a reference emulsion system without fluorocarbon, and the effect is observed even without additional oxygen supply.

中文翻译：

将碳载金催化剂固定在全氟化碳乳液液滴上，以促进水相D-葡萄糖氧化中的氧气输送

负载在多孔载体上的金属纳米颗粒（NPs）的催化活性可以通过各种因素控制，例如NPs的大小，形状或分散性，以及它们与载体的相互作用或载体材料本身的性能。但是，这些内在特性并不完全负责整个反应系统的催化行为，因为催化剂的局部环境和表面覆盖物与反应物，产物，中间体和其他受污染物质在催化过程中通常也起着至关重要的作用。在与气态反应物的液相反应中，它们的溶解度通常很低，因此它们的作用尤其重要。一个例子是_D在多孔碳上负载的金纳米颗粒上，用分子氧对葡萄糖进行氧化。本文报道了通过将非均相催化剂固定在全氟化碳乳液液滴界面上来促进这种水相氧化反应中氧气输送的可能性。碳载金催化剂颗粒可以稳定水相中的全氟化碳小滴，并且金纳米颗粒周围环境中氧化剂的局部浓度加快了反应的限速步骤。因此，具有最佳体积分数的碳氟化合物的系统的反应速率高于没有碳氟化合物的参考乳液系统的反应速率，并且即使没有额外的氧气供应，也可以观察到效果。

更新日期：2021-01-14

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