Base‐free synthesis of bio‐derived 2,5‐furandicarboxylic acid using SBA‐15 supported heteropoly acids in ionic liquids

Abstract

2,5-Furandicarboxylic acid (FDCA) is a green and renewable substitute to terephthalic acid (TPA), the fundamental monomer of polyethylene terephthalate (PET) plastic. This work investigated novel supported Keggin phosphormolybdic acids (HPMs) for the synthesis of FDCA from 5-hydroxymethylfurfural (HMF) in imidazole ionic liquids. Among four supporters, Al 2 O 3 , SiO 2 , ZSM-5 and SBA-15, SBA-15 exhibited highest stability and specific surface area 507 m 2 /g. FDCA yield achieved 76 % by using HPM/SBA-15, and maintained 60 % after 5 runs. Particularly, [Bmim]Cl ionic liquid was stable both in thermal and chemical properties by confirmation of FTIR and NMR. HPM/ SBA-15 was also employed in different monosaccharides to FDCA, and led to acceptable yields. A moderate FDCA yield of 34 % from glucose was obtained, revealing a great potential of one-pot synthesis of FDCA from renewable and accessible carbohydrates.