项目来源

美国国家能源科学基金(DOE)

项目主持人

Tsapatsis,Michael

项目受资助机构

THE JOHNS HOPKINS UNIVERSITY

财政年度

2022,2020

立项时间

未公开

项目编号

DE-SC0021212

项目级别

国家级

研究期限

未知 / 未知

受资助金额

436209.00美元

学科

Separation Science

学科代码

未公开

基金类别

Grant

关键词

未公开

参与者

Matuszak, Daniel

参与机构AI

华东理工大学

项目标书摘要：This research elucidates how the flexibility of confined zeolitic imidazolate frameworks(ZIFs)affects the separation of gas mixtures,using a thin film configuration.ZIFs are nanoporous molecular sieves with potential for application to a range of membrane-and adsorption-based gas separations.
        The research approach will employ vapor-phase synthesis,testing,simulation,and characterization approaches in order to test hypotheses regarding the flexibility of nanoconfined ZIFs.This class of nanocomposite ZIF thin films is unique and exhibits interesting separations performance in part because of a unique synthesis approach:an all-vapor-phase ligand induced permselectivation(LIPS)method(Science 361,1008-1011(2018)),and a modification of LIPS through a vapor phase linker/ligand treatment(VPLT)method that leads to large selectivity improvements for certain gas mixtures(Angew.Chem.Int.Ed.58,16390–16394(2019)).In particular,the propylene/propane separation performance of LIPS/VPLT ZIF membranes confined(entirely or partially)inside mesopores is remarkably superior to that of most conventional ZIF membranes consisting of unconfined(deposited on the external surface of porous supports)polycrystalline films.However,a fundamental understanding of the factors that lead to such performance is not available.
        It is hypothesized that the mesoporous support,which serves as the matrix of the selective ZIF component of the membrane,through interfacial interactions plays a vital role in affecting the ZIF structure.The combination of LIPS with VPLT is an essential part of a methodology for testing this hypothesis.This research consists of four interwoven methodological challenges:(i)extension of the LIPS/VPLT methods to create a range of membrane nanostructures;(ii)adsorption isotherm and diffusivity determination using a combination of experiments and mathematical analysis;(iii)structure determination;and(iv)molecular-level understanding using simulations.Task 1 will be performed at JHU(Tsapatsis)to address(i)and(ii)above,while Task 2 will encompass characterization methods(iii)and be accomplished at Brookhaven National Lab and SBU(Boscoboinik).Task 3 focusses on simulations(iv),and it will be performed at UMN(Siepmann).
        Overall,this research elucidates structural characteristics that are responsible for the high performance of confined ZIF nanocomposites in order to extend the use of LIPS and VPLT to other confined metal organic framework(MOF)nanocomposites.