Impact of Controlled Morphology and Defect Density on Gas Sorption in a MOF for Direct Air Capture of Carbon Dioxide
- Type: Conference Presentation
- Conference Type: AIChE Annual Meeting
- Presentation Date: November 10, 2021
- Duration: 25 minutes
- Skill Level: Intermediate
- PDHs: 0.50
We have studied a series of metal organic framework (MOF) materials with the aim of optimizing and scaling them up as solid sorbents for direct air capture of CO2. Specifically, we are interested in tuning the particle size of the MOFs and the porosity of both the nano- and meso- porous structures present in a packed-bed geometry. A test series of controlled UiO-66 materials with well-characterized defect-levels and particles sizes was examined initially, and then we selected MOFs that have a high capacity (mmol/g) of CO2 while also considering the isosteric heat of adsorption (Qst). Herein we will report on results for Mg-MOF-74-en (Capacity = 1.51 mmol/g).
Modulated syntheses of Mg-MOF-74 using a variety of modulators (benzoic acid, formic acid, and salicylic acid) resulted in variable and controllable particle sizes and morphologies, indicating that Mg-MOF-74 is highly favorable for morphological and size control studies relating to synthesis and gas sorption performance. The resulting MOF samples were studied using isothermal gravimetric and volumetric sorption techniques. Based on these results, a subset of the MOFs were studied under multiple sorption/regeneration cycles in a packed bed sorption apparatus under DAC operating conditions.
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|AIChE Undergraduate Student Members||Free|