期刊
GREEN CHEMISTRY
卷 22, 期 7, 页码 2301-2309出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9gc03961a
关键词
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资金
- Catalysis Center for Energy Innovation, an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, office of Basic Energy Sciences [DE-SC0001004]
- DOE Office of Science [DE-AC02-06CH11357]
We use ultra-Small Angle X-ray Scattering (USAXS) to investigate the evolution of size, morphology, volume fraction and number concentration of humins formed during dehydration of fructose to 5-hydroxymethylfurfural (HMF), and the further polymerization of HMF between 80-95 degrees C in 1 M hydrochloric acidic solutions. The radius of gyration (R-g) of suspended humins particles grows linearly with time and is accompanied by an increase in polydispersity (PD), before possible precipitation occurs. The scattering patterns indicate fractal-like structures. The apparent activation energy of humins growth is 102 +/- 0.4 kJ mol(-1). The trends in the number of particles over time reveal competing processes entailing the continuous formation of new particles (nucleation) leading to increasing polydispersity with time and the aggregation of existing particles and possible precipitation. The direct observation of growth of humins indicates that humins form primarily from HMF rather than fructose.
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