UTSA-16 Growth within 3D-Printed Co-Kaolin Monoliths with High Selectivity for CO₂/CH₄, CO₂N₂, and CO₂/H₂ Separation

Abstract

Honeycomb monoliths loaded with metal-organic frameworks (MOFs) are highly desirable adsorption contactors because of their low-pressure drop, rapid mass-transfer kinetics, and high-adsorption capacity. Moreover, three-dimensional (3D)-printing technology renders direct material modification a realistic and economic prospect. In this study, 3D printing was utilized to impregnate kaolin-based monolith with UTSA-16 metal formation precursor (Co), whereupon an internal growth was facilitated via a solvothermal synthesis approach. The cobalt weight loading in the kaolin support was varied systematically to optimize the MOF growth while retaining monolith mechanical integrity. The obtained UTSA-16 monolith with 90 wt % loading exhibited similar textural features and adsorption characteristics to its powder analogue while improving upon structural integrity. In comparison to previously developed 3D-printed UTSA-16 monoliths, the UTSA-16-kaolin monolith not only showed higher MOF loading but also higher compression stress, indicative of its robust structure. Furthermore, the 3D-printed UTSA-16-kaolin monolith displayed a comparable CO₂ adsorption capacity to the UTSA-16 powder (3.1 vs 3.5 mmol/g at 25°C and 1 bar), which was proportional to its loading. Selectivity values of 49, 238, and 3725 were obtained for CO₂/CH₄, CO₂/N₂, and CO2

Department(s)

Chemical and Biochemical Engineering

Comments

The authors would like to thank financial support from NASA-EPSCoR through the project NNX15AK38A.

Keywords and Phrases

Adsorption; Carbon Dioxide; Crystalline Materials; Kaolin; Mass Transfer; Organometallics; Powder Metals; Stress Analysis; Adsorption Characteristic; High Adsorption Capacity; Mass-Transfer Kinetics; Material Modifications; Mechanical Integrity; Metalorganic Frameworks (MOFs); Separation Potential; Solvothermal Synthesis; 3D Printers; 3D Printing; Honeycomb Monolith; MOF Growth; UTSA-16

International Standard Serial Number (ISSN)

1944-8244; 1944-8252

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2018 American Chemical Society (ACS), All rights reserved.

Publication Date

01 Jun 2018

PubMed ID

29750498

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