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Adsorbent Particle Design for Application in Gas Adsorption Processes
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Metal-organic frameworks (MOFs) are novel materials that are showing great potential
for different applications and in particular for gas adsorption-based separation
processes. MOFs have been subject to a growing scientific interest due to their particular
framework versatility and also because they have higher porosity and surface areas in
comparison to other traditional adsorbents. Since these materials are relatively new, they
are still only mostly studied in their primary powder form. To further study the feasibility
of application of MOFs in gas adsorption processes such as Pressure Swing Adsorption
(PSA), these must be shaped into body like forms, such as pellets or extrudates.
One particular MOF, aluminum terephthalate (MIL-53(Al)) has a very high surface
area with a great capacity to adsorb a large amount of gases such as carbon dioxide
(CO2). Due to its characteristics there is interest in further studying this material in gas
adsorption processes. Therefore, the objective of this work is to shape MIL-53(Al) with
different techniques and study the characteristics of the formulated particles.
MIL-53(Al) was shaped using two different methods: compression without a binder
(binderless) and extrusion with a binder. The binderless method resulted in two samples,
one with a 1ton-force compression and another with a 0.5ton-force compression.
Polyvinyl alcohol (PVA) was used as a binder to shape four samples with percentages of
binder between 2% and 15%. The obtained shaped materials were characterized using
several mechanical, structural and physico-chemical techniques. Furthermore, CO2 adsorption
equilibria measurements were performed to understand the adsorption capacity
of shaped MIL-53(Al) and compared it to its primary powder form. The shaped materials
with the best characteristics to be used in CO2 gas adsorption processes were the
binderless sample of 0.5ton-force compression and the sample with 5% of PVA binder.
Overall, both methods show good potential in shaping MIL-53(Al) and may be a good fit
for future scale-up studies.
Descrição
Palavras-chave
Gas Adsorption Equilibria Adsorbent Materials Metal-organic frameworks (MOFs) Carbon Dioxide CO2 Adsorbent Shaping Design