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Efficient formation of 5-( hydroxymethyl ) furfural from glucose with photoassist-phosphorylated TiO 2 catalyst
| Content Provider | Semantic Scholar |
|---|---|
| Author | Hattori, Masashi Kamata, Keigo Hara, Michikazu |
| Copyright Year | 2017 |
| Abstract | Biomass conversion has been extensively investigated to provide a renewable feedstock for the production of useful chemicals. 5-(hydroxymethyl)furfural (HMF) is an attractive intermediate for such a biomass-derived chemical platform because it can be further converted into various polymers. We have reported that phosphate-immobilized TiO2 (P-TiO2) acts as a highly efficient heterogeneous catalyst for HMF formation in biphasic reaction systems [1,2]. While an increase in surface immobilized phosphate species (Ti-OPO(OH)2) that are formed by esterification between phosphoric acid and surface terminal OH groups on TiO2 improves the HMF selectivity, the density of surface OH groups on TiO2 is limited, so that the amount of phosphate species immobilized on TiO2 through esterification is also restricted, which limits further improvement of the HMF selectivity for the catalyst. Here, we report the photoassisted phosphorylation of anatase TiO2 to prepare a catalyst for efficient HMF production. TiO2 is known to exhibit superhydrophilicity during and after UV light irradiation due to excess formation of surface OH groups under light irradiation. The esterification of phosphoric acid and OH groups on such TiO2 would increase the density of surface phosphate species, thereby enhancing the catalytic performance. Phosphate species were immobilized on TiO2 prepared by a sol-gel reaction simply by immersing TiO2 in 1 M H3PO4 solution for 2– 7 days at 303 K with and without fluorescent light irradiation. The phosphate-immobilized TiO2 prepared under fluorescent light irradiation was used as P-TiO2-L. 0.25 g of each prepared catalyst was examined through HMF production from glucose in a biphasic reaction system consisting of 3 mL of 2-sec-Butylphenol (SBP) and an aqueous glucose solution (distilled water; 1 mL, ᴅ-glucose (0.1 g). Fig. 1 shows the catalytic activities (408 K, 4 h) and the surface atomic ratios of P to Ti (P/Ti) of P-TiO2-L and P-TiO2. The P/Ti ratios were estimated from the X-ray photoelectron spectroscopy spectrum for each sample. Both HMF selectivity and P/Ti ratio shows higher value in the case of P-TiO2-L than that of PTiO2. These results indicate that phosphateimmobilization under light irradiation provides a higher density of surface phosphate species than conventional methods, which increases the HMF selectivity of P-TiO2-L up to 80% under optimal conditions [3]. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.acid-base-catalysis.com/wp-content/uploads/2017/05/id_101.pdf |
| Alternate Webpage(s) | http://www.shokubai.org/tocat8/pdf/Oral/OD501.pdf |
| Alternate Webpage(s) | http://www.shokubai.org/16kjsc/pdf/General_oral/GO_C17.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
