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Colloidal Processing and CO₂-Capture Performance Al₂O₃-Zeolite 13X Composites

L. Andersson, F. Akhtar, A. Ojuva, L. Bergström

Journal of Ceramic Science and Technology, Vol. 3, No. 1 (2012), pp. 9-16

DOI: 10.4416/JCST2012-00039

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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.

Keywords

CO2-uptake, adsorption, colloids, alumina, macroporous

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