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Aluminophosphates for CO2 Separation
Department of Matrials and Environmental Chemistry, Berzelii Center Exselent on Porous Materials, Arrhenius Laboratory, Stockholm University, Stockholm.
Department of Matrials and Environmental Chemistry, Berzelii Center Exselent on Porous Materials, Arrhenius Laboratory, Stockholm University, Stockholm.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials.
Department of Matrials and Environmental Chemistry, Berzelii Center Exselent on Porous Materials, Arrhenius Laboratory, Stockholm University, Stockholm.
2011 (English)In: ChemSusChem, ISSN 1864-5631, Vol. 4, no 1, 91-97 p.Article in journal (Refereed) Published
Abstract [en]

The pressure-swing adsorption method for carbon dioxide capture would ideally be facilitated by adsorbents with a high capacity and a high selectivity for CO2. Several aluminophosphates with 8-ring window apertures (AlPO4-17, AlPO4-18, AlPO4-53, and AlPO4-25) were synthesized by hydrothermal crystallization, calcined, and their CO2 uptake and CO2/N-2 selectivity were studied. CO2 and N-2 uptake was determined for pressures up to 101 kPa at 273 and 293 K. Langmuir and Toth adsorption models were used to describe the adsorption isotherms. The CO2 and N-2 uptakes strongly indicated that the squeezed 8-ring windows of certain aluminophosphates can sieve CO2 from a CO2 and N-2 gas mixture. Both AlPO4-53 and AlPO4-25 exhibited a remarkably higher uptake of CO2 compared to N-2. The hydrophilicity of the AlPO4 materials was investigated by means of water adsorption, and the results showed that all of the tested aluminophosphates were less water sensitive than a benchmark zeolite (13X). In particular, AlPO4-53 and AlPO4-25 showed a very low degree of water uptake with up to 20-30% relative humidity. Determination of cyclic adsorption and desorption confirmed the relatively hydrophobic nature of the aluminophosphates, which render them less energy costly for the regeneration of adsorbents.

Place, publisher, year, edition, pages
2011. Vol. 4, no 1, 91-97 p.
Keyword [en]
adsorption, aluminophosphates, carbon dioxide fixation, hydrophilicity, sustainable chemistry
National Category
Engineering and Technology
Research subject
Engineering Science with specialization in Nanotechnology and Functional Materials
Identifiers
URN: urn:nbn:se:uu:diva-149734DOI: 10.1002/cssc.201000256ISI: 000287138900015OAI: oai:DiVA.org:uu-149734DiVA: diva2:405337
Available from: 2011-03-22 Created: 2011-03-22 Last updated: 2011-12-28Bibliographically approved

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