The production of 2,5‐furandicarboxylic acid (FDCA) from the selective oxidation of 5‐hydroxymethylfurfural (HMF) is a critical step in the production of biopolymers from biomass‐derived materials. In this study, we report the catalytic performance of monometallic Au and Pd, and bimetallic AuPd nanoparticles with different Au : Pd molar ratios synthesised under continuous flow conditions using a millifluidic set‐up and subsequently deposited onto titanium dioxide as the chosen support. This synthetic technique provided a better control over mean particle size and metal alloy composition, that resulted in higher FDCA yield when the catalysts were compared to similar batch‐synthesised materials. A 99% FDCA yield was obtained with the millifluidic‐prepared AuPd/TiO₂ catalyst (Au : Pd molar composition of 75 : 25) after being calcined and reduced at 200 °C. The heat treatment caused a partial removal of the protective ligand (polyvinyl alcohol) encapsulating the nanoparticles and so induced stronger metal‐support interactions. The catalyst reusability was also tested, and showed limited particle sintering after five reaction cycles.

中文翻译：

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连续流式合成双金属AuPd催化剂，可将5-羟基甲基糠醛选择性氧化为2,5-呋喃二甲酸

由5-羟甲基糠醛（HMF）的选择性氧化来生产2,5-呋喃二甲酸（FDCA）是从生物质衍生的材料生产生物聚合物的关键步骤。在这项研究中，我们报告了使用毫流体设置在连续流动条件下合成的，具有不同Au：Pd摩尔比的单金属Au和Pd以及双金属AuPd纳米颗粒的催化性能，随后沉积在二氧化钛上作为选定的载体。这项合成技术可以更好地控制平均粒径和金属合金成分，与类似的间歇合成材料相比，可以提高FDCA的收率。毫流制备的AuPd / TiO ₂可获得99％的FDCA收率煅烧并在200°C下还原后的催化剂（Au：Pd摩尔组成为75:25）。热处理导致部分去除了包裹纳米颗粒的保护性配体（聚乙烯醇），因此引发了更强的金属-载体相互作用。还测试了催化剂的可重复使用性，并且在五个反应循环后显示出有限的颗粒烧结。