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Strong and binder free structured zeolite sorbents with very high CO 2-over-N 2 selectivities and high capacities to adsorb CO 2 rapidly
Department of Materials and Environmental Chemistry, Stockholm University.ORCID iD: 0000-0003-4888-6237
Department of Materials and Environmental Chemistry, Stockholm University.
Department of Materials and Environmental Chemistry, Stockholm University.
Department of Materials and Environmental Chemistry, Stockholm University.
2012 (English)In: Energy & Environmental Science, ISSN 1754-5692, E-ISSN 1754-5706, Vol. 5, no 6, p. 7664-7673Article in journal (Refereed) Published
Abstract [en]

Mechanically strong monoliths of zeolite NaKA with a hierarchy of pores displayed very high CO2-over-N2 selectivity. The zeolite monoliths were produced by pulsed current processing (PCP) without the use of added binders and with a preserved microporous crystal structure. Adsorption isotherms of CO2 and N2 were determined and used to predict the co-adsorption of CO2 and N2 using ideal adsorbed solution theory (IAST). The IAST predictions showed that monolithic adsorbents of NaKA could reach an extraordinarily high CO2-over-N2 selectivity in a binary mixture with a composition similar to flue gas (15 mol% CO2 and 85 mol% N2 at 25 °C and 101 kPa). Structured NaKA monoliths with a K+ content of 9.9 at% combined a CO2-over-N2 selectivity of >1100 with a high CO2 adsorption capacity (4 mmol g−1) and a fast adsorption kinetics (on the order of one minute). Estimates of a figure of merit (F) based on IAST CO2-over-N2 selectivity, and time-dependent CO2 uptake capacity, suggest that PCP-produced structured NaKA with a K+ content of 9.9 at% offers a performance far superior to 13X adsorbents, in particular at short cycle times.

Place, publisher, year, edition, pages
2012. Vol. 5, no 6, p. 7664-7673
National Category
Other Materials Engineering
Research subject
Engineering Materials
Identifiers
URN: urn:nbn:se:ltu:diva-10111DOI: 10.1039/C2EE21153JLocal ID: 8dbc39e8-d900-4b2e-9f93-56fcaeba28baOAI: oai:DiVA.org:ltu-10111DiVA, id: diva2:983051
Note
Upprättat; 2012; 20150416 (farakh)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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