Multi-layer silica ceramic membrane for flue gas and natural gas separations.
Nwogu, Ngozi Claribelle
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NWOGU, N.C., ORAKWE, I.R. and GOBINA, E. 2015. Multi-layer silica ceramic membrane for flue gas and natural gas separations. Lecture notes in engineering and computer science: the Proceedings of the world congress on engineering and computer science 2015 (WCECS 2015), 21 - 23 October 2015, San Francisco, USA. Hong Kong: Newswood Limited, International Association of Engineers, IAENG [online], pages 651-655. Available from: http://www.iaeng.org/publication/WCECS2015/WCECS2015_pp651-655.pdf
The overall goal of this paper is to foster the development of new membrane technologies to improve manufacturing efficiency and reduce CO2 emissions. Hence, a multi-layered silica ceramic membrane with extremely low defect concentrations has been prepared through three successive dip-coating steps using a silica solution. An asymmetric structure is obtained by the deposition of silica layer on top of a combination titanium and α-Al2O3 support. The morphology of the three step homogenous silica layer is analysed by scanning electron microscope. The transport property of the membranes was carried out at room temperature and at pressure differences ranging from 1 to 2 bar. The fabricated membrane has reproducible high permeance for CO2. Interestingly, an almost equal flow rate was observed for CH4 and N2 at a pressure of 2 bar. Separation factors obtained from CO2/CH4 and CO2/N2 are comparatively higher than Knudsen separation values.