Additive manufacturing for adsorption‐related applications—A review

Abstract

The effective shaping of adsorbents is essential to guarantee a high‐efficiency energetic process in what concerns adsorptive applications. In this way, additive manufacturing is gaining significance in developing structured materials in the field of gas adsorption processes. Additive manufacturing is a promising alternative to the traditional shaping techniques, which possess some drawbacks. This paper aims to review the state‐of‐art of additive manufacturing technologies in the manufacturing of adsorbent structures. To do so, an overview of the existent shaping techniques is done, followed by a summarized description of the leading existing additive manufacturing technologies. Then, the application of additive manufacturing technologies to the development of adsorbent materials and other materials for chemical engineering‐related applications is also reviewed.

Zeolites as Selective Adsorbents for CO2 Separation

“…There are many processing methods to obtain shaped zeolites (e.g., extrusion, coating of scaffolds and honeycombs, colloidal processing and casting of porous powders, sacrificial templating, 3D printing). ,,− Extrusion of pellets/granules and honeycomb structures is a widely applied commercial method. In this method, the zeolite is mixed with inorganic and organic binders, additives and with water, after which the mixture is extruded through a die resulting in the desired shape.…”

Deployable and Retrievable 3D-Printed Zeolite–Polymer Composites for Wastewater Treatment: A Review

“…55 Effective ink preparation is a critical factor in the fabrication process of 3D-printed zeolite−polymer composites, as it is necessary for the ink to exhibit pseudoplastic behavior. 55 This pseudoplastic behavior enables the ink to be extruded and deposited smoothly without deformation in the layered structure. To ensure the formation of a stable 3D structure composite, it is essential to carefully consider and optimize the parameters and environmental conditions during the printing process.…”

“…However, the adoption of 3D printing for manufacturing purposes presents various challenges. These challenges include, but are not limited to material availability, accuracy and precision of 3D-printed components, shape optimization, scalability, the necessity for pre and postprocessing, fabrication costs, error control, upscaling, and many more. , Additionally, the selected material and its structure must withstand the demanding conditions encountered in wastewater treatment, including pH variations, biodegradation, and exposure to various toxic pollutants . Different 3D printing techniques have their own advantages and drawbacks.…”

MIL-101(Cr) Polymeric Fiber Adsorbents for Sub-Ambient Post-Combustion CO2 Capture

“…Adsorptive separations, either pressure swing adsorption (PSA), temperature swing adsorption (TSA), or a combination of the two, offers an interesting path for post-combustion CO 2 capture. − A wide range of work has been done in the past few years to enable more efficient CO 2 capture in areas including process design, optimization, and materials synthesis. − An interesting component of all of these areas of development has been the formation of alternative structured adsorbents to the traditional pellet-packed bed to explore opportunities to augment performance. Fiber adsorbents, along with honeycomb monoliths, laminate sheets, and 3D printed structures produced via additive manufacturing, offer reduced pressure drops and opportunities for more efficient heart management to better utilize many of the new and existing adsorbent materials being developed. − A few adsorbent materials have been successfully manufactured into fiber sorbents, including Zeolites X and Y, metal–organic frameworks including UiO-66 and ZIF-8, solid supported amines, and porous organic cages. ,− This class of structured adsorbents shows especially high potential for their ability to both passively and actively manage heat in PSA and TSA applications either through the modification of the bore of the fiber or the incorporation of passive heat managing additives. − Low pressure drops and ability to manage the deleterious effects of thermal swings in the fixed bed can help to augment performance with improved transport and energetics …”