Zukal Arnošt, Kubů Martin
Department of Synthesis and Catalysis, J. Heyrovský Institute of Physical Chemistry of the ASCR, v.v.i., Academy of Sciences of the Czech Republic, Dolejškova 2155/3, 182 23 Prague, Czech Republic.
Dalton Trans. 2014 Jul 21;43(27):10558-65. doi: 10.1039/c4dt00389f. Epub 2014 Apr 14.
The porous structure of pillared zeolites IPC-3PI and MCM-36 and their precursors IPC-3P and MCM-22P, respectively, has been investigated by means of a high-resolution adsorption analysis. The analysis was based on argon adsorption isotherms measured at 87 K from the relative pressure of 10(-6). The isotherms were processed by means of the t-plot method, which made it possible to distinguish adsorption in micropores from adsorption in mesopores. The pore size distribution was evaluated from argon isotherms using Non-Local Density Functional Theory. The obtained results have shown that the microporous structure of the MWW layers is preserved in both pillared zeolites. In contrast to precursors IPC-3P and MCM-22P, pillared samples are characterized by the formation of a porous structure belonging to the lower mesopore region. The distribution of mesopores in the zeolite IPC-3PI is broader and is shifted to larger widths in comparison with the zeolite MCM-36.
分别通过高分辨率吸附分析研究了柱状沸石IPC - 3PI和MCM - 36及其前驱体IPC - 3P和MCM - 22P的多孔结构。该分析基于在87K下从10(-6)的相对压力测量的氩吸附等温线。通过t - 图法处理等温线，这使得区分微孔中的吸附和中孔中的吸附成为可能。使用非局部密度泛函理论从氩等温线评估孔径分布。所得结果表明，MWW层的微孔结构在两种柱状沸石中均得以保留。与前驱体IPC - 3P和MCM - 22P相比，柱状样品的特征在于形成了属于较低中孔区域的多孔结构。与沸石MCM - 36相比，沸石IPC - 3PI中的中孔分布更宽且向更大宽度偏移。
