Department of Chemistry and Chemical Biology, Rutgers University, 610 Taylor Road, Piscataway, NJ, 08854, USA.
Advanced Membranes and Porous Materials Center, Physical Sciences and Engineering Division, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia.
Nat Commun. 2018 May 1;9(1):1745. doi: 10.1038/s41467-018-04152-5.
As an alternative technology to energy intensive distillations, adsorptive separation by porous solids offers lower energy cost and higher efficiency. Herein we report a topology-directed design and synthesis of a series of Zr-based metal-organic frameworks with optimized pore structure for efficient separation of C6 alkane isomers, a critical step in the petroleum refining process to produce gasoline with high octane rating. ZrO(OH)(bptc) adsorbs a large amount of n-hexane but excluding branched isomers. The n-hexane uptake is ~70% higher than that of a benchmark adsorbent, zeolite-5A. A derivative structure, ZrO(OH)(HO)(abtc), is capable of discriminating all three C6 isomers and yielding a high separation factor for 3-methylpentane over 2,3-dimethylbutane. This property is critical for producing gasoline with further improved quality. Multicomponent breakthrough experiments provide a quantitative measure of the capability of these materials for separation of C6 alkane isomers. A detailed structural analysis reveals the unique topology, connectivity and relationship of these compounds.
作为一种替代能源密集型蒸馏的技术，多孔固体的吸附分离具有更低的能耗和更高的效率。在此，我们报告了一系列具有优化孔结构的基于 Zr 的金属-有机骨架的拓扑导向设计和合成，用于高效分离 C6 烷烃异构体，这是石油炼制过程中的一个关键步骤，可生产高辛烷值的汽油。ZrO(OH)(bptc) 吸附大量的正己烷，但不包括支链异构体。正己烷的吸附量比基准吸附剂沸石-5A 高约 70%。ZrO(OH)(HO)(abtc) 的衍生物结构能够区分所有三种 C6 异构体，并对 3-甲基戊烷相对于 2,3-二甲基丁烷产生高的分离因子。这种特性对于进一步提高汽油质量至关重要。多组分穿透实验为这些材料分离 C6 烷烃异构体的能力提供了定量的衡量标准。详细的结构分析揭示了这些化合物的独特拓扑、连接性和关系。
