823-82-5Relevant articles and documents
Effective Oxidation of 5-Hydroxymethylfurfural to 2,5-Diformylfuran by an Acetal Protection Strategy
Asakawa, Miyuki,Boonyakarn, Tat,Chen, Lulu,Fukuoka, Atsushi,Hensen, Emiel J. M.,Nakajima, Kiyotaka,Wiesfeld, Jan J.
, (2022/02/25)
An acetal protection strategy for 5-hydroxymethylfurfural (HMF) was used to obtain 2,5-diformyfuran (DFF) using concentrated HMF solutions and a γ-Al2O3-supported Ru catalyst (Ru/γ-Al2O3). The HMF-acetal with 1,3-propanediol can be oxidized to DFF-acetal with a yield of 84.0 % at an HMF conversion of 94.2 % from a 50 wt % solution. In contrast, aerobic oxidation of nonprotected HMF using a 10 wt % solution afforded DFF only in a moderate yield (52.3 %). Kinetic studies indicated that the six-membered ring acetal group not only prevents side reactions but also accelerates aerobic oxidation of the ?CH2OH moiety to ?CHO under retention of the acetal functionality. Organic deposits formed during the reaction explained the significant decrease in the activity of the Ru/γ-Al2O3 catalyst, which could be recovered neither by washing in water or organic solvents, nor by a calcination-reduction treatment. Sonication of the used Ru/γ-Al2O3 catalyst in an aqueous NaOH solution successfully removed the deposits and allowed reuse of the catalyst for at least four times without activity loss.
Hydroxyapatite Supported Manganese Oxide as a Heterogeneous Catalyst for the Synthesis of 2, 5-Diformylfuran
Chen, Hong,Li, Yingying,Li, Yongdan,Ma, Xueli,Wang, Can,Wang, Sen,Yu, Linhao
, (2022/02/16)
A series of hydroxyapatite (HAP) supports with different Ca/P ratios were synthesized to prepare the MnOx/HAP catalysts. A MnOx/HAP catalyst showed highly efficient conversion of 5-hydroxymethylfurfural (HMF) into 2, 5-diformylfuran (DFF) in toluene solvent under no-alkali condition. 86.4% conversion of HMF with 90.9% selectivity of DFF at 120?°C for 12?h under 1.0?MPa O2 over the MnOx/HAP-10.0-400 were obtained. The redox of Mn4+/Mn3+ improved the oxidation of 5-HMF to DFF by the lattice oxygen, and the lattice oxygen was replenished by adsorbing O2 molecules. The reusability tests were found the catalyst could be reused up to four cycles without notable loss of catalytic activity. The MnOx/HAP-10.0-400 was a stable and reusable material for further industrial exploration of DFF in an environmentally friendly way. Graphical Abstract: [Figure not available: see fulltext.]
Method for preparing 2, 5-furandicarboxaldehyde by degrading carbohydrate
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Paragraph 0019-0048, (2021/06/22)
The invention relates to a method for preparing 2, 5-furandicarboxaldehyde by degrading carbohydrate. The method comprises the following steps: 1) placing 20-40 parts by weight of cane sugar or glucose, 0.2-0.5 part by weight of a catalyst, 1-2 parts by weight of a dispersing agent and 80-100 parts by weight of an organic solvent in a reaction kettle, sealing, and uniformly stirring to form a mixed solution, wherein the catalyst is cerium dioxide with a particle size of less than 100 nm; and 2) introducing air into the reaction kettle under the condition of continuously stirring, keeping the pressure in the reaction kettle at 2-5 MPa and the temperature at 70-90 DEG C, reacting for 1-2 hours, then stopping the reaction, and naturally cooling to room temperature to obtain a mixed solution with 2, 5-furandicarboxaldehyde as a main component. The method has the advantages of mild reaction conditions, no need of high temperature and high pressure, high yield of 2, 5-furandicarboxaldehyde, no need of a complicated HMF separation step, cost reduction, and better conformity to the target of green chemistry.