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Materials Science in Additive Manufacturing Emerging 3D-printed zeolitic gas adsorbents

Figure 9. Schematic of zeolite frameworks with different sizes of pores and channels. Adapted with permissions from Liu et al. (CHA framework) and
[92]
Asgar Pour and Sebakhy (LTA, MFI, and FAU frameworks).
[93]
Table 3. Selected types of zeolites used for 3D printing of gas adsorbents
Zeolite Framework Printing Zeolite loading BET surface Adsorption capacity (mmol/g) Targeted usage References
technique (wt%) area (m /g)
2
5A LTA DIW 80 – 90 395 – 543 1.59 CO removal [91]
2
5A LTA DIW 92.1 540 3.7 CO adsorption [94]
2
5A LTA DLP 70 361 1.6 CO adsorption [95]
2
ZSM-5* MFI DIW 75 390 - CO adsorption [94]
2
ZSM-5 MFI DIW 65 261 1.08 for N 2 CO , CH , and N 2 [96]
4
2
1.41 for CH 4 separation
2.39 for CO 2
ZSM-5 MFI DIW 84 330 – 339 45.9 – 47.8 for toluene (humidified) Volatile organic [97]
34.1 – 44.3 for toluene (humidified) compounds removal
ZSM-5 MFI SLA - 311 - CO adsorption [98]
2
SA* FAU DIW 81.6 96 - CO adsorption [94]
2
13X FAU DIW 80 – 90 498 – 571 1.6 CO removal [91]
2
13X FAU DIW 64.5 – 66.7 550 – 640 3.3 – 3.5 CO adsorption [94]
2
13X FAU DIW 90 767.429 - CO adsorption [99]
2
13X FAU DIW 83.3 – 85 550 – 570 0.7 – 1.6 (dry) CO capture [100]
2
0.3 – 0.5 (humidified)
SAPO-34* CHA DIW 50 263/357 1.8 – 5.41 CO /N separation [101]
2 2
Abbreviations: BET, Brunauer-Emmett-Teller; CHA, chabazite; DIW, direct ink writing; DLP, digital light process; FAU, faujasite; LTA, Linda type A; MFI,
mordenite framework inverted; SA: South Asia zeolite; SAPO-34: silicoaluminophosphate-34; SLA, stereolithography; ZSM-5: zeolite Socony mobil-5.
Zeolite powder needs to be made into a paste/slurry for material that has a high surface area and can form strong
3D printing because it is difficult to extrude the powder bonds with zeolite particles, resulting in good mechanical
directly. The zeolite-based paste preparation for 3D strength of the printed monoliths [103] . Aluminophosphate
printing is usually achieved with the aid of additives, such solution can provide good adhesion between the zeolite
as inorganic and organic binders. Inorganic materials such particles and improve the mechanical strength of the
as bentonite clay, colloidal silica, and aluminophosphate printed monoliths [104] . Lefevere et al. discussed the impact
solution have been investigated as primary binders for the of the above-mentioned inorganic materials on the quality
3D printing of zeolite monoliths. Bentonite clay is a natural of 3D-printed zeolites. The shrinkage of printed zeolites
mineral known for its high swelling properties and colloidal would be reduced when bentonite was mixed in a 50/50
behavior, making it suitable for use as a binder in 3D ratio with aluminophosphate or colloidal silica to form a
printing [102] . Colloidal silica, on the other hand, is a synthetic binary binder system [105] .

Volume 2 Issue 4 (2023) 9 https://doi.org/10.36922/msam.1880