A novel study of sulfur-resistance for CO 2 separation through asymmetric ceramic-carbonate dual-phase membrane at high temperature
Tutkimustuotos: Lehtiartikkeli › › vertaisarvioitu
- National University of Singapore
- Arizona State University
Sulfur compounds present in high-temperature gases from various industrial sources have a negative influence on the permeability of different kinds of membranes. In this study, we present a general and efficient strategy to design and prepare two asymmetric membranes for CO 2 separation that are resistant to H 2 S. The asymmetric membranes, mainly composed of one adsorbed layer for H 2 S consumption and one dense ceramic-carbonate layer for CO 2 separation, show not only high CO 2 permeation flux but also remarkably stable permeation behavior under an H 2 S-containing atmosphere. The sulfur-resistant stability times of the asymmetric membranes are approximately 10–12 times higher than the single ceramic-carbonate dual-phase membrane. The adsorbed layer of the asymmetric membranes can react with H 2 S to form Ce-O-S phases, gradually causing deactivation of the adsorbed layer. However, the adsorbed layer can be regenerated in the oxygen-containing gas stream above 850 °C, which can effectively remove the sulfur content from the adsorbed layer, making recycle of the membrane possible. Sulfur accumulated in the adsorbed layer of the membrane as a Ce 2 O 2 S phase, can be oxidized into SO 2 under air stream and elemental sulfur (S) under a 2.5% O 2 /He gas stream. These asymmetric membranes thus possess high permeation stability in the H 2 S-containing atmosphere with good regenerability and also have potential in collection and removal of sulfur impurities from gas streams.
|Julkaisu||Journal of Membrane Science|
|Tila||Julkaistu - 1 heinäkuuta 2019|
|OKM-julkaisutyyppi||A1 Julkaistu artikkeli, soviteltu|