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With the PTFE membrane as the substrate, a novel Ag-based catalytic membrane reactor (CMR) was fabricated by deep-permeation synthesis fabrication (DPSF). In DPSF, ZIF-8 was first assembled inside the membrane pores by permeation flow and the depositing reaction of Zn 2+ , and 2-methylimidazole solutions flow through the membrane synergistically. Then, Ag was reduced inside the pores impregnating ZIF-8 nanoclusters by Ag + and reductant solutions flowing through the membrane similarly. The TEM images of the cross-sectional membrane exhibited the composite nanoparticles of Ag+ZIF-8 with good dispersion and size distribution (10−50 nm). The as-synthesized (Ag+ZIF-8)@PTFE was applied to the catalytic reduction of p-nitroaniline to pphenylenediamine in a continuous flow-through reactor and presented remarkable catalyzing performance. The maximal apparent reaction rate constant is 3−4 orders of magnitude higher than that reported with good stability.

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It is challenging to fabricate stable, complete, controllable, homogeneous metal–organic framework composites. Hereof, we suggested a versatile method where nanocrystals were assembled inside the porous polymer by synergistic chemical synthesis and permeation flow in and through its pores. The poly­(tetrafluoroethylene) (PTFE)/ZnO and PTFE/ZIF-8 were fabricated as the prototype of the composites. For fabricating the composite, ZnO was first synthesized inside the pores followed by ligand vapor treatment. The even and well-distributed ZnO nanorods of 10–30 nm were synthesized inside pores of PTFE and converted into ZIF-8. The ZnO and ZIF-8 were quantified in 281 and 431 mg g–1 against the original PTFE, respectively. The composite is stable and the nanocrystals are not readily washed away. The adsorption uptake (C3 > C2 > C1) of the light hydrocarbon gases for the PTFE/ZIF-8 nanocomposite were preliminarily evaluated. The adsorption selectivities were calculated, where the selectivities for C2H6/CH4 and C3H8/CH4 were 10.9 and 42.8, respectively.

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