Adsorption of CO2 on mixed oxides derived from hydrotalcites at high temperatures and pressures

K. SAPAG; J. VILLARROEL ROCHA; A. GIL; S.I. GARCÉS POLO; S.A. KORILI

Manchester - Inglaterra

Simposio; Seventh International Symposium on Energy; 2017

Seventh International Symposium on Energy

Dry reforming of methane constitutes an effective way to convert two greenhouse effect gases, CH4 and CO2, to synthesis gas, a mixture of H2 and CO that can be used as feedstock in several industrial processes such as the production of liquid fuels by Fischer?Tropsch synthesis.Carbon dioxide used in dry reforming can be captured from flue gases of industrial combustion processes and power plants by several methods such as absorption, adsorption, or membrane separation. Absorption is widely used due to high efficiency and low cost; however it is not the best method at the high temperatures required for CO2 separation and reaction. Adsorption of CO2 by CaO or MgO-based materials and hydrotalcites, is an alternative route that works well for high temperature CO2 capture and consecutive reaction.In this work Co, Fe and Ni mixed oxides having a metal content of 5 wt% were prepared by wet impregnation of a hydrotalcite support in order to be used as catalysts in dry reforming of methane.Carbon dioxide adsorption capacity of the solids was measured at the temperature range from 25 to 50 °C, up to a pressure equal to 1000 kPa, and at 300 °C up to a pressure equal to 4400 kPa. Nickel mixed oxides had a sorption capacity considerably higher than the one reported in the literature for hydrotalcite-based materials usually used as catalytic supports under similar conditions.