Capturing carbon dioxide in biomass gas by calcium-based sorbents
钙基吸附剂捕集生物质燃气中的二氧化碳

The capture of carbon dioxide in biomass pyrolysis gas is one of the key issues to improve the calorific value of the gas and achieve the goal of carbon reduction. In this study, the high concentration carbon dioxide in the gas was successfully captured by chemical adsorption method, in the beneficial condition of the high temperature of the biomass pyrolysis gas. Thus, series of calcium-based solid sorbents were prepared by different calcium-based precursors. The experiments of series of calcium-based solid sorbents on carbon dioxide single adsorption and cycle adsorption indicated that the sorbent which was mixed with calcium and magnesium had better stability of cycle adsorption and adsorption load. The analysis of the structure of the hole showed that the effective pore size was less than 4 nm. Therefore, calcium and magnesium-based solid sorbent with suitable pore size could be obtained by modifying the natural dolomite, reaching the goal of capturing carbon dioxide in biomass gas.