化学
催化作用
布朗斯特德-洛瑞酸碱理论
路易斯酸
水溶液
ZSM-5型
沸石
产量(工程)
脱水反应
酸强度
脱水
溶剂
有机化学
无机化学
材料科学
生物化学
冶金
作者
Mercedes Moreno‐Recio,J. Santamarı́a-González,Pedro Maireles‐Torres
标识
DOI:10.1016/j.cej.2016.05.120
摘要
Three different acid ZSM-5 zeolites (H-, Fe- and Cu-ZSM-5) have been prepared and tested in the catalytic dehydration of glucose into 5-hydroxymethylfurfural (HMF). A commercial NH4-ZSM-5 zeolite (MFI) was modified by thermal or ion-exchange treatments in order to create Brönsted and Lewis acid sites. The zeolitic structure is preserved, and the resulting acid zeolites have demonstrated to be active in the glucose dehydration. The influence of different experimental variables, such as reaction time and temperature, substrate:catalyst molar ratio, volume of the organic solvent and aqueous phase, as well as the density and nature of acid sites, on the catalytic behaviour was investigated. Under the optimal reaction conditions, by using a biphasic NaCl (20 wt%) aqueous solution/methyl isobutyl ketone (MIBK) system, a glucose conversion of 80% and a HMF yield of 42% were achieved at 195 °C, after only 30 min, using H-ZSM-5, which has the lowest Lewis/Brönsted molar ratio among the prepared zeolites. The reutilization of this catalyst was also examined.
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