کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1743323 | 1522013 | 2012 | 7 صفحه PDF | دانلود رایگان |
Carbon dioxide capture and storage is gaining attention as a strategy to abate greenhouse gas emissions. However, currently available commercial processes to remove CO2 from flue gas streams, mainly from N2 are costly and energy intensive. A silicalite-1 membrane was prepared on a porous alumina support using hydrothermal synthesis. The resulting silicalite-1 membranes were modified using Li solutions in order to achieve better CO2 separation. SEM micrographs exhibited a thin, uniform and compact silicalite-1 film well adhered to the alumina support. Crystallinity of the membrane was confirmed by XRD. CO2 and N2 permeation experiments were carried out in a stainless steel module. CO2 single gas permeation was measured through a silicalite-1 membrane from room temperature to 400 °C, having a 25 psi pressure on the feed side. The resulting CO2 permeance measurements indicated molecular sieving as the principal transport mechanism for the unmodified silicalite-1 membrane, whereas surface diffusion is the principal transport mechanism for lithium-modified silicalite-1 membranes. The separation between CO2 and N2 takes place due to preferential CO2 adsorption and diffusion, which in turn hinders N2 permeation through the silicalite-1 pore network. A CO2/N2 separation factor up to 6 at 25 psi and 400 °C was obtained using the silicalite-1 modified membrane, whereas this was 1.46 using the unmodified silicalite-1 membrane.
► A novel Li silicalite-1 membrane was synthesized, characterized and evaluated for CO2 separation.
► The presence of Li in the silicalite-1 membrane improves the CO2/N2 separation factor up to 6 times.
► Lithium modified silicalite-1 membrane is a good candidate material for the high temperature absorption and removal of CO2.
Journal: International Journal of Greenhouse Gas Control - Volume 10, September 2012, Pages 494–500