期刊
DALTON TRANSACTIONS
卷 48, 期 3, 页码 989-996出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8dt04186e
关键词
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资金
- National Natural Science Foundation of China [51802094]
- Science and Technology Program of Hunan Province, China [2018RS3084]
- Hunan Provincial Natural Science Foundation of China [2018JJ3122]
- National Key R&D Program of China [2017YFC1103800]
- NNSFC [5181101338, U1663225, 51611530672, 21711530705, 11872179]
- Hubei Provincial Natural Science Foundation of China [2016CFA033]
- Hunan Provincial Innovation Foundation for Postgraduate [CX2017B679]
- BMBF [03SF0492C]
- Hunan Provincial Department of Education [17B070]
The concentration of benzoic acid was found to exercise efficient control over the formation of either MIL-101(Cr) or MIL-88B(Cr) under otherwise similar hydrothermal synthetic conditions. Nanocrystals of MIL-101(Cr) with similar to 100 nm average size and excellent S-BET = 3467 m(2) g(-1) are obtained at lower concentrations of benzoic acid, while at higher concentrations the microparticulated MIL-88B(Cr) product is formed. Hereby a new efficient synthetic method towards the elusive MIL-88B(Cr), yet reported only once without synthetic details, is proposed. The obtained MIL-88B(Cr) has an interesting and potentially valuable property of retaining its high-volume form (V-cell similar to 2000 angstrom(3)) after thermal activation. The degassing of MIL-88B(Cr) in a vacuum at 250 degrees C yields a porous material with a S-BET area of 1136 m(2) g(-1), which is around the theoretical maximum. The transition to the denser 'closed' form (V-cell similar to 1500 angstrom(3)) occurs only at 350 degrees C, when all of the benzoate/benzoic acid, hindering the process, is removed.
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