R.W. van den Brink

Sorption-enhanced hydrogen production for pre-combustion CO2 capture: Thermodynamic analysis and experimental results

Hydrotalcite-based materials have been identified as suitable materials for high temperature (400 8C) adsorption of CO2. In pre-combustion decarbonisation processes for natural gas based power cycles, it should be possible to use this material to improve conversions in the water-gas shift (WGS) and steam-reforming (SMR) reaction. The efficiencies for electricity production from natural gas have been calculated for some different system configurations, in which hydrotalcite-based material could be used. The calculated efficiency penalties ranged from 5.5 to 8.6 percentage points. The assumptions made in the system study have been tested on the laboratory scale. Hydrotalcite-based materials are found to be an excellent choice for use in the sorption-enhanced WGS reactor. The requirements for very low residual concentrations of CO2 at 400 8C and large amounts of catalyst in the sorptionenhanced SMR reactor make its application less likely. Suggestions are made to how the SESMR could be improved.

Advanced oxygen production systems for power plants with integrated carbon dioxide (CO2) capture

Abstract: This chapter deals with advanced oxygen generation technologies and oxyfuel power plant systems with integrated oxygen selective membranes. Section 10.2 shows the main air separation technologies, existing and under development: cryogenic air separation units, pressure and vacuum swing adsorption, chemical looping, the ceramic autothermal recovery (CAR) process and oxygen selective membranes. Section 10.3 presents materials for oxygen selective membranes in oxyfuel applications. Section 10.4 shows oxyfuel power plant schemes with integrated oxygen selective membranes and discusses their technical performance. The following sections show advantages and limitations; future trends; and sources of further information about advanced oxygen generation technologies before concluding.