文献类型：期刊文献

英文题名：Mesoporous niobium phosphate: an excellent solid acid for the dehydration of fructose to 5-hydroxymethylfurfural in water

作者：Zhang, Yu[1];Wang, Jianjian[1];Ren, Jiawen[1];Liu, Xiaohui[1];Li, Xiangcheng[1];Xia, Yinjiang[1];Lu, Guanzhong[1];Wang, Yanqin[1]

机构：[1]E China Univ Sci & Technol, Shanghai Key Lab Funct Mat Chem, Res Inst Ind Catalysis, Shanghai 200237, Peoples R China

年份：2012

卷号：2

期号：12

起止页码：2485

外文期刊名：CATALYSIS SCIENCE & TECHNOLOGY

收录：;EI(收录号：20124615674441);WOS:【SCI-EXPANDED(收录号:WOS:000310950000014)】；

基金：This project was supported financially by the 973 Program of China (2010CB732300), the NSFC of China (No. 21101063 and 20973058), the Science and Technology Commission of Shanghai Municipality (No. 10XD1401400; 10dz2220500) and the Fundamental Research Funds for the Central Universities, China.

语种：英文

外文关键词：Solutions - Synthesis (chemical) - X ray diffraction - Catalyst activity - Mesoporous materials - Niobium compounds - Pore size - Dehydration - High resolution transmission electron microscopy

摘要：By using cetyltrimethylammonium bromide (CTAB) as the template, a series of mesoporous niobium phosphates were synthesized at different pH values in an aqueous solution. Techniques such as small-angle X-ray diffraction, transmission electron microscopy (TEM) and N-2 sorption technique were employed to characterize the mesoporous structures of thus-synthesized materials, EDAX to detect the composition, FTIR and solid state P-31 MAS NMR to investigate the framework information, while their acidic properties were analyzed using NH3-TPD and pyridine-FTIR. Samples prepared at neutral to acidic conditions exhibited high surface area (213-297 m(2) g(-1)), narrow pore size distribution (3-4 nm) and a great number of strong Lewis and Bronsted acid sites. These materials exhibited excellent activity in the dehydration of fructose to 5-hydroxymethylfurfural (HMF) in water. The maximum HMF yield reached 45% under 130 degrees C with a reaction time of 0.5 h and the yield slightly decreased to 32% after five cycles and the five-cycled catalyst can be almost regenerated by calcination at 500 degrees C with the yield of 40%. The excellent catalytic activity obtained in the aqueous phase can be attributed to its high acid site density and the tolerance to water.