Gäumann Patrick, Ferri Davide, Sheptyakov Denis, van Bokhoven Jeroen A, Rzepka Przemyslaw, Ranocchiari Marco
Laboratory of Catalysis and Sustainable Chemistry, Paul Scherrer Institut, CH-5232 Villigen, Switzerland.
Bioenergy and Catalysis Laboratory, Paul Scherrer Institut, CH-5232 Villigen, Switzerland.
J Phys Chem C Nanomater Interfaces. 2023 Aug 16;127(33):16636-16644. doi: 10.1021/acs.jpcc.3c03225. eCollection 2023 Aug 24.
Even though confinement was identified as a common element of selective catalysis and simulations predicted enhanced properties of adsorbates within microporous materials, experimental results on the characterization of the adsorbed phase are still rare. In this study, we provide experimental evidence of the increase of propene density in the channels of Zn-MOF-74 by 16(2)% compared to the liquid phase. The ordered propene molecules adsorbed within the pores of the MOF have been localized by in situ neutron powder diffraction, and the results are supported by adsorption studies. The formation of a second adsorbate layer, paired with nanoconfinement-induced short intermolecular distances, causes the efficient packing of the propene molecules and results in an increase of olefin density.
尽管限域被认为是选择性催化的一个共同要素，且模拟预测微孔材料中吸附质的性能会增强，但关于吸附相表征的实验结果仍然很少。在本研究中，我们提供了实验证据，表明与液相相比，Zn-MOF-74通道中丙烯密度增加了16(2)%。通过原位中子粉末衍射确定了有序吸附在MOF孔内的丙烯分子的位置，吸附研究也支持了这一结果。第二个吸附质层的形成，加上纳米限域导致的短分子间距离，使得丙烯分子有效堆积，从而导致烯烃密度增加。
