节点可访问的MOF
Zhiyong Lu1,2, Jian Liu2, Xuan Zhang2
1College of Mechanics and Materials, Hohai University, Nanjing 210098, P. R. China.
Journal of the American Chemical Society
|December 2, 2020
概括
基于的金属有机框架 (MOF) 的新激活方法优化了催化点. 这增强了它们在降解化学武器中的作用,并改善了孔的可及性.
科学领域:
- 材料科学
- 催化剂
- 纳米技术
背景情况:
- 基于的金属有机框架 (MOF) 是有前途的异质催化剂和支.
- 理想的MOF激活涉及终端OH/H2O对用于移植催化集群并暴露易斯酸Zr(IV) 位点.
- 像NU-1000这样的Zr-MOF的常规激活导致形成连接体,阻碍了催化位点的可访问性.
研究的目的:
- 开发Zr-MOF的替代激活协议,避免合.
- 为了提高催化性能,安装全套终端OH/H2O对.
- 调查酸盐去除对MOF特性和催化活性的影响.
主要方法:
- 单晶X射线衍射以表征MOF中间体和最终结构.
- 使用特定溶剂条件开发替代激活协议.
- 对化学战剂模拟剂的水解性降解的催化活性进行评估.
主要成果:
- 一个新的激活协议成功地去除了调节器和形成物,产生了8个水联体和4个化物.
- 用OH/OH2对完全取代甲酸盐,可提高水合体的热可变性,使该位点在较低的温度下暴露.
- 经过修改的NU-1000在G型化学战剂模拟剂的催化水解中表现出大约10倍的活性.
结论:
- 在Zr-MOF激活过程中消除酸盐对于实现最佳的催化场所可访问性和活性至关重要.
- 新的协议促进可逆孔径控制,并增强催化部位的热可变性.
- 这项工作在设计高活性MOF基催化剂方面取得了重大进展,用于具有挑战性的化学应用.
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