Benzoic acid as a selector-modulator in the synthesis of MIL-88B(Cr) and nano-MIL-101(Cr)

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 ∼100 nm average size and excellent S BET = 3467 m 2 g −1 are obtained at lower...

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Veröffentlicht in:Dalton transactions : an international journal of inorganic chemistry 2019-01, Vol.48 (3), p.989-996
Hauptverfasser: Yang, Ling, Zhao, Tian, Boldog, Ishtvan, Janiak, Christoph, Yang, Xiao-Yu, Li, Qiang, Zhou, Yan-Jia, Xia, Yong, Lai, Deng-Wang, Liu, Yue-Jun
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Sprache:eng
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Zusammenfassung: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 ∼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 ∼ 2000 Å 3 ) after thermal activation. The degassing of MIL-88B(Cr) in a vacuum at 250 °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 ∼ 1500 Å 3 ) occurs only at 350 °C, when all of the benzoate/benzoic acid, hindering the process, is removed. 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.
ISSN:1477-9226
1477-9234
DOI:10.1039/c8dt04186e