Department of Chemical & Biological Engineering, Monash University, Wellington Road, Clayton, VIC, Australia.
Nat Commun. 2023 Mar 21;14(1):1563. doi: 10.1038/s41467-023-37250-0.
Furfural (CHO) is an important platform chemical for the synthesis of next-generation bio-fuels. Herein, we report a novel and reusable heterogeneous catalyst, Pd-PdO/ZnSO with 1.1 mol% palladium (Pd), for the production of furfural by flash pyrolysis of lignocelluloses at 400 °C. For both dry and wet C6 cellulose and its monomers, the furfural yields reach 74-82 mol%, relative to 96 mol% from C5 xylan and 23-33 wt% from sugarcane bagasse and corncob. The catalyst has a well-defined structure and bifunctional property, comprising a ZnSO support for the dehydration and isomerization of glucose, and a local core-shell configuration for metallic Pd encapsulated by an oxide (PdO) layer. The PdO layer is active for the Grob fragmentation of formaldehyde (HCHO) from glucose, which is subsequently in-situ steam reformed into syn-gas (i.e. H and CO), whereas the Pd core is active in promoting the last dehydration step for the formation of furfural.
糠醛（CHO）是合成下一代生物燃料的重要平台化学品。在此，我们报告了一种新型且可重复使用的非均相催化剂 Pd-PdO/ZnSO，其负载有 1.1 mol%钯（Pd），可通过在 400°C 下对木质纤维素进行闪速热解来生产糠醛。对于干纤维素和湿纤维素及其单体，糠醛的产率达到 74-82 mol%，相对于 C5 木聚糖的 96 mol%和甘蔗渣和玉米芯的 23-33 wt%。该催化剂具有明确的结构和双功能特性，包含 ZnSO 载体，用于葡萄糖的脱水和异构化，以及局部核壳结构，其中金属 Pd 被氧化物（PdO）层包裹。PdO 层可使葡萄糖中甲醛（HCHO）发生 Grob 断裂，随后原位蒸汽重整为合成气（即 H 和 CO），而 Pd 核则可促进最后一步脱水反应生成糠醛。
