Abstract
This work investigates the morphological control of the anisotropic [Zn2(NDC)2(DABCO)]n MOF (Metal organic framework) and the subsequent adsorption characteristics for CO2/CH4 gas separation. Morphology of the MOF crystals is controlled by the use of modulators. The addition of acetic acid or pyridine successfully produce rod or plate morphologies, respectively, with each morphology possessing a different major surface pore aperture. Single-component equilibrium and kinetic adsorption data for CO2 and CH4 were collected. Equilibrium analysis indicates a slight selectivity towards CO2 whereas kinetic data unexpectedly shows lower diffusion time constants for CO2 compared to CH4. Mass transfer resistances on each species is discussed. Finally, a coating technique termed solution shearing is used to orient different morphologies on substrates as a film. An increase in film orientation is observed for the rod morphology, indicating that this MOF morphology is a promising candidate to create large area, thin-film applications.
Highlights
The efficient separation of CO2 from CH4 is critical for the technoeconomic success of the natural and biogas industries, current industrial separation techniques are energy intensive or require high capital and operational expenses [1,2]
[Zn2 (NDC)2 (DABCO)]n Metal organic frameworks (MOFs) can be created with the use of acetic acid or pyridine
Given our previous results with aligning faceted MOF particles and the well-faceted, high aspect ratio of the MOF used in this study, we identified the [Zn2 (NDC)2 (DABCO)]n morphologies as good candidates for creating oriented thin films
Summary
The efficient separation of CO2 from CH4 is critical for the technoeconomic success of the natural and biogas industries, current industrial separation techniques are energy intensive or require high capital and operational expenses [1,2]. Common separation processes such as cryogenic distillation require a significant amount of energy and do not align with “green” chemistry practices, highlighting the need to find alternative approaches [1,2]. An ideal separation platform would use synthesized and tunable materials, and would be effective regardless of intake quantities and concentrations
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