Highly active and stable Ru–(OH)-based catalysts supported on Ni–manganite for the base-free aerobic oxidation of 5-hydroxymethyl furfural to 2,5-furan dicarboxylic acid in a noble water–organic solvent system

Abstract

Highly efficient and robust Ru supported on nickel–manganite catalysts for selective conversion of 5-hydroxymethyl furfural into 2,5-furan dicarboxylic acid in a solvent mixture of noble water and acetone with eliminating homogeneous base addition.

Continuous flow oxidation of HMF using a supported AuPd-alloy

“…The solubility of FDCA strongly depends on the pH of the solution, with alkaline solution resulting in the formation of a Na-carboxylate, which was reported to have a higher solubility compared to the carboxylic acid. 53 Thus, the higher concentration of the sodium base enhances the formation rate of the Na-salt of FDCA, which is important under the short residence time compared to the long contact time in batch, avoiding a strong adsorption of the carboxylic acid on the catalyst surface. 54 This disparity underscores the importance of tailoring the reaction conditions to the specific characteristics of the continuous flow system for optimal catalytic performance.…”

Electron Structure Tuned Oxygen Vacancy‐Rich AuPd/CeO2 for Enhancing 5‐Hydroxymethylfurfural Oxidation

“…5-hydroxymethyl-2-furancarboxylic acid (HMFCA) and 5-formyl-2-furancarboxylic acid (FFCA) as the crucial intermediate products are detected (Figure S5), indicating that the aldehyde group (À CHO) of HMF was firstly transformed and then the oxidation of methylol group (À CH 3 OH) (Figure 3b route 1), and the result consistence with the nitrogen-doped carbon supported AuPd catalyst reported by Wang and co-worker. [42] The HMF conversion over all catalysts is closely 99.9 % for 240 min at 50 °C, indicating their unique performance in oxidation of HMF. In particular, Au 2 Pd 1 /a 2 À CeO 2 by acidic treatment exhibits the higher catalytic activity, with a FDCA yield of 90.1 %, while the activity of Au 2 Pd 1 /CeO 2 catalyst decreases considerably (27.4 %).…”

“…[3,4] Carbohydrate-derived 5-hydroxymethylfurfural (HMF), as important biomass-based platform compound, can be used as raw material to prepare FDCA. [5] The cascade oxidation of HMF to FDCA involved in the conversion of the aldehyde group and hydroxymethyl group to carboxyl group. [6,7] Moreover, the activation of gaseous oxygen, as the pollution-free oxidant, to convert reactive oxygen species in oxidation process has become thorny obstacles to efficient preparation of FDCA.…”

TEMPO/PhI(OAc)2 promotes the α-aminophosphinoylation of alcohols with amines and H-phosphine oxides in aqueous medium

“…1 The choice of solvents and withdrawal of toxic additives in synthetic processes are the principles of green chemistry, 2 which can avoid the generation of hazards, toxicity, and pollution. Within this context, organic synthesis in the aqueous phase has become a powerful platform for designing a green chemical process 3 because it is an extremely abundant, non-toxic, non-corrosive and non-flammable solvent. However, the utilization of water as a reaction medium faces some challenges for organic synthesis due to poor solubility of organic compounds.…”