Benzoic acid as a selector-modulator in the synthesis of MIL-88B(Cr) and nano-MIL-101(Cr)
Benzoic acid as a selector-modulator in the synthesis of MIL-88B(Cr) and nano-MIL-101(Cr)
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苯甲酸作为 MIL-88B(Cr) 和纳米 MIL-101(Cr) 合成中的选择调节剂
DOI：
10.1039/c8dt04186e
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发表时间：
2019
影响因子：
4
通讯作者：
Liu Yue-Jun
中科院分区：
文献类型：
--
作者：
Yang Ling;Zhao Tian;Boldog Ishtvan;Janiak Christoph;Yang Xiao-Yu;Li Qiang;Zhou Yan-Jia;Xia Yong;Lai Deng-Wang;Liu Yue-Jun
发现苯甲酸的浓度在其它类似的水热合成条件下对MIL-101（Cr）或MIL-88 B（Cr）的形成进行有效控制。在较低浓度的苯甲酸下获得具有约100 nm平均尺寸和优异的SBET = 3467 m2 g-1的MIL-101（Cr）纳米晶体，而在较高浓度下形成微粒化的MIL-88 B（Cr）产物。据此，提出了一种新的有效的合成方法对难以捉摸的MIL-88 B（铬），但只有一次报告没有合成细节，提出。所获得的MIL-88 B（Cr）具有在热活化后保持其高体积形式（Vcell 2000 μ 3）的有趣且潜在有价值的性质。MIL-88 B（Cr）在250 °C的真空中脱气产生具有1136 m2 g−1的SBET面积的多孔材料，其在理论最大值附近。只有在350 °C时，当所有阻碍该过程的苯甲酸酯/苯甲酸被去除时，才发生向更致密的“封闭”形式（Vcell = 1500 × 3）的转变。
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 SBET = 3467 m2 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 (Vcell ∼ 2000 Å3) after thermal activation. The degassing of MIL-88B(Cr) in a vacuum at 250 °C yields a porous material with a SBET area of 1136 m2 g−1, which is around the theoretical maximum. The transition to the denser ‘closed’ form (Vcell ∼ 1500 Å3) occurs only at 350 °C, when all of the benzoate/benzoic acid, hindering the process, is removed.