In situ UV–VIS spectrophotometry within the second time scale as a research tool for solid-state catalyst and liquid-phase reactions at high temperatures: Its application to the formation of HMF from glucose and cellulose
| Autor: | Tsubasa Hatanaka, Kunio Kawamura, Michio Ueshima, Tomoko Yasuda, Nami Matsuda, Kazuhiro Hamahiga, Kazuyuki Nakai |
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| Rok vydání: | 2017 |
| Předmět: |
Chemistry(all)
General Chemical Engineering Batch reactor 02 engineering and technology 010402 general chemistry Cooling bath 01 natural sciences Industrial and Manufacturing Engineering Catalysis law.invention Ultraviolet visible spectroscopy law Spectrophotometry Micrometer medicine Environmental Chemistry medicine.diagnostic_test Chemistry General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Volumetric flow rate Chemical engineering Chemical Engineering(all) Absorption (chemistry) 0210 nano-technology |
| Zdroj: | Chemical Engineering Journal. 307:1066-1075 |
| ISSN: | 1385-8947 |
| DOI: | 10.1016/j.cej.2016.09.036 |
| Popis: | We successfully developed an in situ UV–VIS absorption spectroscopic flow reactor system for investigation of solid-liquid two-phase reactions within the second time scale at high temperatures (solid-state-catalyst-mediated hydrothermal flow reactor system, SSCM-HF). The SSCM-HF consisted of a water reservoir, high-pressure pump, sample injector, high-temperature reactor involving solid-state catalysts, a cooling bath, a pressure regulator, and a temperature controller. The high-temperature reactor contains a reactor column having micrometer sized solid particles, and is connected to an optical window using transparent fused-silica capillary tubing. Liquid samples are exposed for the second time scale, which can be adjusted by changing the flow rate. In situ monitoring of reactions using SSCM-HF was performed at 200–1114 nm within 7.36–117.79 s at temperatures up to 300 °C and pressures up to 30 MPa. We demonstrated the usefulness of SSCM-HF by inspecting 5′-hydroxymethylfurfural (HMF) formation from glucose and cellulose. The influence of metal oxides, such as WO3 and Nb2O5, was investigated using both a conventional batch reactor and the SSCM-HF. The simple metal oxides showed catalytic activities for the dehydration of glucose to HMF. The SSCM-HF demonstrated in situ detection of a small amount of HMF in the presence of WO3 deposited solid particles within 29.4 s at 200 °C. This study demonstrates the application of the SSCM-HF as a new research tool for screening and investigating solid-state catalysts in detail in liquid-phase reactions at high temperatures. |
| Databáze: | OpenAIRE |
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