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Colloidal Processing and CO2-Capture Performance Al2O3-Zeolite 13X Composites
L. Andersson, F. Akhtar, A. Ojuva, L. Bergström
Department of Materials and Environmental Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden
received October 7, 2011, received in revised form December 14, 2011, accepted January 16, 2012
Vol. 3, No. 1, Pages 9-16 DOI: 10.4416/JCST2012-00039
Abstract
Hierarchically porous composites for CO2-capture have been produced by coating the inner walls of foam-like macroporous alumina monoliths, produced by templated synthesis, with microporous zeolite 13X particles. Homogeneous and dense coatings of the particulate adsorbent were obtained when the impregnation process was performed at a pH above 9. At this pH-level the colloidally stable suspensions of the negatively charged zeolite 13X particles could fill all the voids of the highly connected pore space of the alumina supports and attach to the monolith walls, which had been pre-coated with poly(ethylene imine). A CO2-uptake as high as 5 mmol CO2/g zeolite 13X was achieved for alumina-zeolite 13X composites through minimisation of the added inorganic binder, kaolin, to only 3.0 wt% with respect to zeolite content, and through optimisation of the thermal treatment.
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Keywords
CO2-uptake, adsorption, colloids, alumina, macroporous
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