Niobic acid and niobium phosphate as highly acidic viable catalysts in aqueous medium: Fructose dehydration reaction
Niobic acid and niobium phosphate as highly acidic viable catalysts in aqueous medium: Fructose dehydration reaction
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DOI：
10.1016/j.cattod.2006.07.024
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发表时间：
2006-12-15
期刊：
影响因子：
5.3
通讯作者：
Auroux, Aline
中科院分区：
文献类型：
--
作者：
Carniti, Paolo;Gervasini, Antonella;Auroux, Aline
研究了铌酸（Nb 2 O 5中心点nH 2 O）和磷酸铌（NbOPO 4）表面对果糖脱水反应的催化性能。反应在连续反应器中在90-110 ° C的不同温度和压力（2至6巴）下进行。与铌酸相比，观察到磷酸铌对5-羟甲基-2-糠醛（HMF）的上级活性和选择性。磷酸铌的初始催化性能高于铌酸，这可能与其表面较高的有效酸性有关，这一点通过在不同极性液体中实现的酸碱滴定得到了证明。失活的研究表明，在短时间内比铌酸的流磷酸铌更深的衰减，而对于更高的时间，光损失的活性观察到的催化剂。(c)2006 Elsevier B. V.保留所有权利。
The catalytic properties of niobic acid (Nb2O5 center dot nH(2)O) and niobium phosphate (NbOPO4) surfaces were studied in the reaction of fructose dehydration carried out in water. The reaction was performed in a continuous reactor at different temperatures 90-110 degrees C and pressures (from 2 to 6 bar). Superior activity and selectivity to 5-hydroxymethyl-2-furaldehyde (HMF) of niobium phosphate compared to niobic acid was observed. The initial higher catalytic performance of niobium phosphate than niobic acid could be related to the higher effective acidity of its surface, as was evidenced by acid-base titrations realized in different polar liquids. Deactivation studies showed a deeper decay for niobium phosphate than niobic acid at short time on stream, while, for higher time, light losses of activity were observed for both the catalysts. (c) 2006 Elsevier B.V. All rights reserved.