催化作用
双功能
化学
脱水
果糖
钒
多金属氧酸盐
戊二醛
无机化学
有机化学
生物化学
作者
Ruliang Liu,Jinzhu Chen,Limin Chen,Yuanyuan Guo,Jiawei Zhong
标识
DOI:10.1002/cplu.201402147
摘要
Abstract A series of acidic cesium salts of molybdovanadophosphoric heteropolyacids (CsMVP‐HPAs) are developed as bifunctional and recyclable catalysts for a one‐step approach to 2,5‐diformylfuran (DFF) from fructose with molecular oxygen as the oxidant under environmentally benign conditions. The CsMVP‐HPAs afford the direct synthesis of DFF from fructose through acidic site (H)‐promoted fructose dehydration and metallic site (V)‐catalyzed successive aerobic oxidation of 5‐hydroxymethylfurfural (HMF). The catalytic performances of CsMVP‐HPA toward fructose dehydration and HMF oxidation are related to its acid density and V content, respectively. Moreover, the increase in the V content of CsMVP‐HPA results in its decreased acid density, which suggests its converse catalytic performance toward fructose dehydration and HMF oxidation. An optimum balance between the dehydration and oxidation functions of CsMVP‐HPAs reveals that a ratio of acid density to molar concentration of V between 1.64 and 3.34 achieves a maximum yield of 60 % for DFF from fructose with Cs 3 HPMo 11 VO 40 as a catalyst under atmospheric pressure of oxygen. Moreover, Cs 3 HPMo 11 VO 40 behaves as a heterogeneous catalyst and can be easily reused at least for four times. This research highlights an efficient bifunctional catalyst for transforming renewables into fine chemicals in tandem reactions of dehydration and oxidation.
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