CO2-Stable and Cobalt-Free Dual-Phase Membrane for Oxygen Separation

摘要

The increase in carbon dioxide emissions is considered to be the main contribution to global warming. Therefore, there is an urgent need to reduce the emissions of CO2 into the atmosphere. Recently, CO2 capture and storage technologies to reduce the CO2 emissions from coal-fired power plants have gained the attention of decision makers in governments, industry, and academia. There are three major concepts for CO2 sequestration: post-combustion capture, pre-combustion separation, and oxyfuel techniques. MIECMs, which are ceramic membranes with mixed oxygen ionic and electronic oxygen conductivity, have gained increasing attention owing to their potential applications in oxygen supply to power stations for CO2 capture according to the oxyfuel concept. This concept involves burning natural gas with nitrogen-free oxygen, thus allowing CO2 to be sequestered after steam condensation. Dense MIECMs are promising candidates for this oxygen separation from air. However, when MIECMs are used for this purpose, some of the CO2 is recycled and used as the sweep gas for the oxygen separation, simultaneously lowering the temperature in the burner. Furthermore, CO2-stable MIECMs could be promising for dry reforming and the thermal decomposition of carbon dioxide in combination with the partial oxidation of methane to syngas.