Surface modified dolomitic sorbent for carbon dioxide removal for hydrogen production from coal.

摘要

A material for the removal of carbon dioxide from a gas stream is reported. The overall process consists of synthesizing the material, characterization, and reactivity/capacity testing of the removal agent. In the synthesis process a dolomitic material CaCO3:MgCO3 are co-precipitated by carbon dioxide from a solution made with specific amounts of commercially available CaO and MgO. Characterization was done with BET to determine specific surface area, pore size distribution, specific pore volume; particle size analysis to determine particle size distribution, mean particle size, and d50; SEM/EDS was used to determine surface morphology and Ca:Mg ratio. The reactivity and capacity was measured using TGA by running multiple 20 minute reaction-regeneration cycles at 750°C, one cycle at 800 and 850°C, and a long term test was run on the optimal sample. Reaction cycles were carried out under 100% carbon dioxide and the regeneration cycles were run under nitrogen. The effects of CaO, MgO, and surfactant loading were studied to determine the maximum amount of carbon dioxide removal for the sorbents.