36441-90-4Relevant articles and documents
One-pot sol-gel synthesis of a phosphated TiO2 catalyst for conversion of monosaccharide, disaccharides, and polysaccharides to 5-hydroxymethylfurfural
Rao, Kasanneni Tirumala Venkateswara,Souzanchi, Sadra,Yuan, Zhongshun,Xu, Chunbao
, p. 12483 - 12493 (2019)
Catalytic conversion of biomass or biomass-derived carbohydrates into 5-hydroxymethylfurfural (HMF) is an important reaction for the synthesis of bio-based polymers, fuels, and other industrially useful products. In this study, phosphated titania (P-TiO2) catalysts with different phosphoric acid content were prepared through a simple one-pot sol-gel method and characterized by BET, XRD, FT-IR, NH3-TPD, py-FT-IR, and XPS techniques. The catalyst characterization results revealed the incorporation of phosphorus into the TiO2 framework in the form of a Ti-O-P bond. The P-TiO2 catalysts were applied to the conversion of glucose (≥10 wt%) into HMF in a biphasic water/THF reaction medium at 175 °C. Under optimized reaction conditions, 98% glucose conversion and 53% HMF yield were obtained over a 15P-TiO2 catalyst, and the catalyst was reused for several cycles with consistent activity and selectivity. The presence of both Br?nsted and Lewis acid sites, high BET surface area and pore volume, and high acidity could account for the high catalytic activity and selectivity. Besides, the 15P-TiO2 catalyst was also demonstrated to be active for the conversion of disaccharides (sucrose and cellobiose), polysaccharides (starch and microcrystalline cellulose) and industrial grade sugar syrups into HMF with reasonable yield.
Hydrogenation of crude and purified d-glucosone generated by enzymatic oxidation of d-glucose
Aho, Atte,Lassfolk, Robert,Leino, Reko,Murzin, Dmitry Yu.
, p. 30476 - 30480 (2020/09/11)
D-Fructose is an important starting material for producing furfurals and other industrially important chemicals. While the base-catalyzed and enzymatic conversion of d-glucose to d-fructose is well known, the employed methods typically provide limited conversion. d-Glucosone can be obtained from d-glucose by enzymatic oxidation at the C2 position and, subsequently, selectively hydrogenated at C1 to form d-fructose. This work describes an investigation on the hydrogenation of d-glucosone, using both chromatographically purified and crude material obtained directly from the enzymatic oxidation, subjected to filtration and lyophilization only. High selectivities towards d-fructose were observed for both starting materials over a Ru/C catalyst. Hydrogenation of the crude d-glucosone was, however, inhibited by the impurities resulting from the enzymatic oxidation process. Catalyst deactivation was observed in the case of both starting materials.
Tin Grafted on Modified Alumina-Catalyzed Isomerisation of Glucose to Fructose
Yatoo, Muhamad Aadil,Saravanamurugan, Shunmugavel
, (2019/06/28)
The present study focuses on designing a catalyst based on hot water treated alumina (Al2O3-HWT) for the conversion of glucose to fructose. The glucose isomerisation reactions are performed with tin incorporated on parent Al2O3 and Al2O3-HWT in methanol. 0.5 wt% Sn/Al2O3-HWT affords a combined yield of fructose and methylfructoside (30.4%) which is two-fold higher than that obtained with 0.5wt% Sn/Al2O3 (15.1%), implying the importance of hot water treatment of Al2O3. Al2O3-HWT shows a very broad peak centred around 3440 cm-1, which could be assigned to OH stretching band of gibbsite, γ-Al(OH)3 which significantly diminished after solid state ion-exchange with SnCl4.5H2O (0.5 wt% Sn/Al2O3-HWT). UV-Vis diffused reflectance spectrum of 0.5 wt% Sn/Al2O3-HWT displays a peak centered at 241 nm, which can be ascribed to the incorporation of tin into the alumina network. XRD patterns of 0.5, 3 and 5 wt% Sn/Al2O3-HWT show that no peak corresponding to SnO2 is formed. Importantly, 0.5wt% SnO2/Al2O3-HWT exhibits a low activity, giving 13.2% of the total yield of fructose and methylfructoside, respectively, compared to 0.5wt% Sn/Al2O3-HWT (30.4% fructose), signifying the role of incorporated tin into the alumina network.
