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Enhanced desulfurization performance of hybrid membranes using embedded hierarchical porous SBA-15

Frontiers of Chemical Science and Engineering 2020年第4期14卷 661-672页

作者： Ye Zhang Jian Song Josue Quispe Mayta Fusheng Pan Xue Ga Mei Li Yimeng Song Meidi Wang Xingzhong Cao Zhongyi Jiang School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China Collaborative Innovation Center of Chemical Science and Engineering(Tianjin) Tianjin 300072China Multi-discipline Research Division Institute of High Energy PhysicsChinese Academy of SciencesBejing 100049China

The utilization of materials with a hierarchical porous structure as multi-functional additives is highly attractive in the preparation of hybrid membranes.In this study,novel hybrid membranes are designed by embed-ding hierarchical porous Santa Barbara Amorphous 15(SBA-15)with a dual-pore architecture(micropores and mesopores)for pervaporation desulfurization.The SBA-15 with cylindrical mesopores provides molecular transport expressways to ensure improved permeability,while micropores on the wall have molecular sieving effects that are essential for the enhancement of permselectivity of thiophene molecules.Considering thiophene/n-octane mixture as a model system,the hybrid membrane with embedded 6 wt-%SBA-15 exhibits optimal pervaporation desulfurization performance with a permeation flux of 22.07 kg·m^-2·h^-1 and an enrichment factor of 6.76.Moreover,the detailed structure and properties of hybrid membranes are systematically characterized.This study demonstrates the immense potential of hierarchical porous materials as additives in membranes to simultaneously increase permeability and permselectivity.

关键词： hybrid membranes hierarchical porous SBA-15 sieving effect pervaporation desulfurization

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Separation of hexane isomers by introducing“triangular-like and quadrilateral-like channels”in a bcu-type metal-organic framework

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Nano Research 2021年第2期14卷 526-531页

作者： Dongmei Wang X inglong Dong Yu Han Yunling Liu State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012China Key Laboratory of the Ministry of Education for Advanced Catalysis Materials College of Chemistry and Life SciencesInstitute of Physical and ChemistryZhejiang Normal UniversityJinhua 321004China Advanced Membranes and Porous Materials Center Physical Sciences and Engineering DivisionKing Abdullah University of Science and TechnologyThuwal 23955-6900Kingdom of Saudi Arabia

The separation of hexane isomers is of vital importance to produce high quality gasoline in the petrochemical industry.However,the similar vapor pressure and boiling point of hexane isomers bring great difficulties and challenges in the separation process.sieving effect,which allowing smaller molecules pass through and preventing others,should be a powerful strategy to solve this problem by making good use of porous materials.Therefore,physical separation by metal-organic framework(MOF)materials appears and becomes a burgeoning separation technique in industry.Due to the weak interaction between hexane isomers with absorbents,it puts forward higher requirements for the accurate design of MOF materials with optimal pore system.To address this issue,a novel MOF[Zn_(9)(tba)_(9)(dabco)_(3)]·12DMA-6MeOH(abbreviation:Zn_(9)(tba)_(9)(dabco)_(3);H_(2)tba=4-(1H-tetrazol-5-yl)-benzoic acid;dabco=1,4-diazabicyclo[2.2.2]octane;DMA=N,N-dimethylacetamide)with bcu network has been designed and synthesized by reticular chemistry strategy.Benefiting from the pre-designed topology and suitable linear ligand H_(2)tba and dabco,the structure of Zn_(9)(tba)_(9)(dabco)_(3)exhibits two types of channels with triangular-like and quadrilateral-like geometry.Zn_(9)(tba)_(9)(dabco)_(3)with appropriate channel size and shape displays potential selective adsorption capacity of vapor-phase hexane isomers through sieving effect.Moreover,outstanding gas adsorptive separation properties of Zn_(9)(tba)_(9)(dabco)_(3)could also be speculated by theoretical ideal adsorbed solution theory(IAST),suggesting Zn_(9)(tba)_(9)(dabco)_(3)can be regarded as a potential adsorbent material for purification natural gas_Breakthrough experiments show that Zn_(9)(tba)_(9)(dabco)_(3)is capable of discriminating all four hexane isomers at 298 K,and the corresponding research octane number(RON)of the eluted mixture closes to 95,which is higher than the standard for industrially refined hexane blends(about 83).We speculate that sieving effect and diffusion are a syne

关键词： bcu-type metal-organic framework channel characteristics sieving effect hexane isomers adsorptive separation

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