Efficient synthesis of bio-monomer 2,5-furandicarboxylic acid from concentrated 5-hydroxymethylfurfural or fructose in DMSO/H2O mixed solvent

Vitamin C-Assisted Synthesized Mn–Co Oxides with Improved Oxygen Vacancy Concentration: Boosting Lattice Oxygen Activity for the Air-Oxidation of 5-(Hydroxymethyl)furfural

“…Generally, FDCA can be obtained through the cascade catalytic oxidation of the aldehyde and hydroxymethyl groups of carbohydrate-derived 5-(hydroxymethyl)­furfural (HMF) into carboxyl groups (Scheme ). The preceding efforts regarding the development of catalytic systems for the conversion of HMF into FDCA mainly focused on the noble-metal (e.g., Au, Pt, Pd, and Ru)-based catalysts. − Even though excellent FDCA yields (95–100%) were achieved over these noble metal catalysts, the scarcity and exorbitant price of these catalysts severely restricted their application on the scale-up industrialization process. In this light, exploiting budget non-noble metal (e.g., Mn, Co, Zr, Ni, and Cu) catalysts for the production of FDCA is currently gaining momentum. ,− Especially, manganese-based materials catch the most attention because of their high accessibility, low cost, and unique physical/chemical properties, such as a tunable redox property, diverse oxidation states, and crystal structures. , For example, FDCA yields of 91–99.5% were acquired from HMF over single manganese oxides (MnO 2 and Mn 2 O 3 ) in a long reaction time of 24 h (1–1.4 MPa O 2 , 100 °C). , Besides, various manganese-based bimetal or trimetal oxides (Co–Mn mixed oxide, MnCo 2 O 4 spinel, MnO x –CeO 2 , Ni–MnO x , and CuO·MnO 2 ·CeO 2 ) were also fabricated and proved to be more effective catalysts than pristine manganese oxides for the oxidation of HMF, offering FDCA yields of 85–99% using pure oxygen as the oxidant (4–28 h, 0.8–2 MPa O 2 , 110–120 °C). − However, these catalytic systems suffer from low catalytic efficiency and the requirement of pure oxygen as the oxidant for a high FDCA yield.…”

Tunable HMF hydrogenation to furan diols in a flow reactor using Ru/C as catalyst

“…The depletion of fossil resources together with their contribution to environmental issues related to CO 2 emissions have stimulated research towards the synthesis of chemicals from renewable resources, such as lignocellulosic biomasses [1]. In this regard, 5-hydroxymethylfurfural (HMF) is a key platform-chemical, accessible from monosaccharides and polysaccharides [2][3][4][5][6][7][8][9], and the precursor for several value-added products, such as 2,5furandicarboxylic acid (FDCA), 2,5-dimethylfuran (DMF), 2,5-bis (hydroxymethyl)furan (BHMF), and 2,5-bis(hydroxymethyl)tetrahydrofuran (BHMTHF) [9][10][11][12][13][14][15][16][17][18].The two last compounds are obtained from the hydrogenation of the aldehyde group (BHMF) and also of the furanic ring (BHMTHF), as reported in Scheme 1.…”

Coupling Natural Halloysite Nanotubes and Bimetallic Pt–Au Alloy Nanoparticles for Highly Efficient and Selective Oxidation of 5-Hydroxymethylfurfural to 2,5-Furandicarboxylic Acid

“…In this context, much effort has been devoted to developing heterogeneous catalysts for the selective oxidation of HMF to FDCA. Noble metals such as Pt, ,, Au, − Pd, − and Ru , catalysts are commonly employed due to their excellent catalytic activity, but the product selectivity and catalyst stability are still unsatisfactory. Because the oxidation of HMF to FDCA involves several oxidation steps and various intermediate products, even this process may generate byproducts, which make it difficult to obtain high FDCA selectivity .…”

“…In this context, much effort has been devoted to developing heterogeneous catalysts for the selective oxidation of HMF to FDCA. Noble metals such as Pt, 20,22,23 Au, 24−26 Pd, 27−29 and Ru 19,30 catalysts are commonly employed due to their excellent catalytic activity, but the product selectivity and catalyst stability are still unsatisfactory.…”