Gas phase catalytic application of nanoporous gold

FOR 2213研究单位的子项目1（与SP2合作）的目的是彻底澄清制备npAu催化剂的不同选择如何影响结构和组成，进而影响不同应用领域（全氧化，部分氧化）的催化性能。除了由AuAg制成的npAu（在第一阶段重点关注）之外，由AuCu制成的npAu也将被纳入研究，因为残留的Cu和Ag可以参与不同的机制来激活分子氧。除了质量传输限制特别突出（由于样品的宏观延伸）的整体样品外，还将寻求粉末样品的途径。将这些催化剂与SP9中制备的催化剂（负载型纳米颗粒）进行比较，目的在于理解在受控制备方面的优点或缺点，从而控制催化性能的调节（包括传质限制）。与S合作。位于盖恩斯维尔的佛罗里达大学的Vasenkov测量了质量传输，即，将进行反应物分子在不同npAu样品中的扩散。所得的扩散系数或弯曲度可用于将宏观动力学分解为微观动力学（表面反应）和质量传递。通过这种方式，可以全面了解npAu催化剂的整体性能。研究的反应范围包括CO氧化（完全氧化）、甲醇和乙醇氧化（部分氧化，继续第1阶段的研究）和丙烯氧化（氧化为环氧化物）。其目的是详细了解不同（原）类型的氧化反应的结构和组成前提条件，并与模型实验（SP5），理论（SP7和SP8）和液相催化（SP2）合作。

The aim of subproject 1 (in collaboration with SP2) of the research unit FOR 2213 is a thorough clarification of how different options to prepare npAu catalysts influence the structure and composition and in turn the catalytic properties for different areas of application (total oxidation, partial oxidation). In addition to npAu made from AuAg (focused upon in the first period) also npAu made from AuCu will be included in the studies, as residual Cu and Ag can be involved in different mechanisms to activate molecular oxygen. In addition to monolithic samples where mass transport limitations are particularly prominent (due to the macroscopic extension of the samples) routes to powder samples will be sought. These catalysts will be compared to catalysts prepared in SP9 (supported nanoparticles) aiming at an understanding of the advantages or disadvantages in terms of a controlled preparation and thus a controlled tuning of catalytic properties (including mass transport limitation). In collaboration with S. Vasenkov at the University of Florida at Gainesville measurements with respect to the mass transport, i.e., diffusion of reactant molecules in different npAu samples will be conducted. The resulting diffusivities or tortuosities can be used to disentangle the macro kinetics into the micro kinetics (surface reaction) and mass transport. In this way a full understanding of the overall performance of the npAu catalysts is feasible. The range of reactions studied will range from CO oxidation (total oxidation), methanol and ethanol oxidation (partial oxidation, continuation of the studies in period 1) and propene oxidation (oxidation to epoxides). The aim is a detailed understanding of structural and compositional preconditions for different (proto)types of oxidation reactions in collaboration with model experiments (SP5), theory (SP7 and SP8) and liquid phase catalysis (SP2).