Document details

Adsorbent Particle Design for Application in Gas Adsorption Processes

Author(s): Antunes, Christine Luz

Date: 2016

Persistent ID: http://hdl.handle.net/10362/35809

Origin: Repositório Institucional da UNL

Subject(s): Gas Adsorption Equilibria; Adsorbent Materials; Metal-organic frameworks (MOFs); Carbon Dioxide CO2; Adsorbent Shaping Design; Domínio/Área Científica::Engenharia e Tecnologia::Engenharia Química; Domínio/Área Científica::Engenharia e Tecnologia::Engenharia Química; Domínio/Área Científica::Engenharia e Tecnologia::Engenharia Química


Description

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.

Document Type Master thesis
Language English
Advisor(s) Esteves, Isabel; Ribeiro, Rui; Mota, José
Contributor(s) Antunes, Christine Luz
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