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首页> 外文期刊>Catalysis science & technology >Synthesis of a hierarchically porous niobium phosphate monolith by a sol-gel method for fructose dehydration to 5-hydroxymethylfurfural
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Synthesis of a hierarchically porous niobium phosphate monolith by a sol-gel method for fructose dehydration to 5-hydroxymethylfurfural

机译：合成的分层多孔铌通过溶胶-凝胶方法磷酸庞然大物果糖脱水5-hydroxymethylfurfural

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Hierarchically porous niobium phosphate (NbP) was synthesised via a sol-gel method accompanied by phase separation and employed as a catalyst for fructose dehydration. The niobium precursor was prepared by digesting ammonium niobate(v) oxalate in aqueous H2O2 with citric acid as a chelating agent to prevent the precipitation of niobium hydroxide. Poly(acrylamide) and poly(ethylene glycol) were used as phase separation inducers to produce co-continuous macropores and gel skeletons. The NbP sample calcined at 600 degrees C for 8 h had a high surface area (S-BET approximate to 140 m(2) g(-1)) and large acidity (0.84 mmol-NH3 g(-1)). The NbP monolith was amorphous after calcination at 600 degrees C and transformed into an -NbOPO4 phase at 1000 degrees C. The NbP monolith calcined at 600 degrees C was an efficient acid catalyst for the dehydration of fructose to 5-hydroxymethylfurfural in water (70% yield) or in aqueous dimethyl sulfoxide (90% yield). The productivity of HMF reached 7.3 x 10(-2) mol h(-1) per kg-solution at an initial fructose concentration of 10.0 wt% in water with a catalyst loading of 2.0 wt%.
机译：分层多孔磷酸铌(平衡)通过溶胶-凝胶方法合成的陪同下相分离和作为催化剂使用果糖脱水。由消化草酸铌酸铵(v)与柠檬酸水溶液过氧化氢作为螯合剂,以防止铌的沉淀氢氧化。乙二醇)被用作相分离抗病诱导剂生产co-continuous大孔隙和凝胶骨架。C 8 h高表面积(S-BET近似到140米(2)g(1))和大酸度(0.84 mmol-NH3 g(1))。非晶后在600度C和煅烧变成一个-NbOPO4阶段在1000度C .所以石门煅烧在600摄氏度一个有效的酸催化剂的脱水果糖5-hydroxymethylfurfural在水(70%收益率)或水二甲亚砜(90%收益率)。10(1)(2)摩尔h / kg-solution初始果糖的浓度10.0 wt %的水催化剂装载2.0 wt %。

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