With the remarkable capability of encapsulating multifunctional active sites inside, carbon-based materials play vital roles in multifarious chemical transformations such as hydrogenation reactions, oxidation reactions, esterification reactions, etc. Herein, we propose an efficient and facile approach to construct a Cu/Co₂P@C-NS catalyst, which consists of nitrogen–sulfur co-doped carbon (C-NS) encapsulated cobalt phosphide (Co₂P) and copper double active sites. This approach focuses on the design and preparation of core–shell materials, that is, the ZIF-67 core is coated with an adhesive poly(cyclotriphosphazene-co-4,4′-sulfonyldiphenol) (PZS) polymer shell. The ZIF-67 core possesses a highly porous structure, coexistence of carbon and nitrogen elements, and uniform dispersion of Co species, making it an ideal template. The heteroatomic PZS polymer with decent coating ability makes it a promising coating material for creating core–shell structures. Additionally, nitrogen species in the PZS polymer could coordinate with Cu²⁺ to introduce extra Cu sites into the system. The Cu/Co₂P@C-NS catalyst prepared from the pyrolysis of the precursor redistributes the surface charge of Co₂P by additionally incorporating Cu, which effectively enhances substrate adsorption. As a result, the Cu/Co₂P@C-NS catalyst demonstrates good catalytic performance in the oxidative esterification of furfuryl aldehydes. This study presents a reliable and straightforward method for preparing a non-noble-metal catalyst that exhibits high efficiency and activity in the one-pot oxidation and esterification of furfurals to methyl furoates.

中文翻译：

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氮、硫共掺杂空心碳包覆Cu/Co2P用于糠醛的选择性氧化酯化

碳基材料具有将多功能活性位点封装在内部的卓越能力，在氢化反应、氧化反应、酯化反应等多种化学转化中发挥着至关重要的作用。在此，我们提出了一种高效且简便的方法来构建Cu/Co ₂ P@C-NS催化剂，由氮硫共掺杂碳（C-NS）封装的磷化钴（Co ₂ P）和铜双活性位点组成。该方法侧重于核壳材料的设计和制备，即ZIF-67核涂覆有粘性聚(环三磷腈-co -4,4′-磺酰基联苯酚)(PZS)聚合物壳。 ZIF-67核具有高度多孔结构、碳氮元素共存以及Co物种均匀分散，使其成为理想的模板。杂原子 PZS 聚合物具有良好的涂层能力，使其成为一种有前途的用于创建核壳结构的涂层材料。此外，PZS 聚合物中的氮物质可以与 Cu ²⁺配位，将额外的 Cu 位点引入系统中。前驱体热解制备的Cu/Co _{2 P@C-NS催化剂通过额外掺入Cu，重新分配Co 2} P的表面电荷，有效增强底物吸附。结果表明，Cu/Co ₂ P@C-NS催化剂在糠醛氧化酯化反应中表现出良好的催化性能。这项研究提出了一种可靠且简单的方法来制备非贵金属催化剂，该催化剂在糠醛一锅氧化和酯化为糠酸甲酯的过程中表现出高效和活性。