Carbon capture and sequestration (CCS) has become an important option for mitigating CO2 emission and global climate change by capturing CO2 from large point sources and sequestering it underground. However, the feasibility of carbon capture is limited by the high cost of carbon capture, and to be more specific, the significant energy requirements during the regeneration of aqueous amine solutions. Breakthrough experiments were performed to measure the CO2 capacity of the surface functionalized sorbents. The samples were initially tested with 10% CO2 in helium without the addition of water. The CO2 capacities for silica gel, zinc silica 1 and zinc silica 2 under different conditions. In general, zinc silica 2 showed the highest capacities, i.e., 3-fold and 7-fold higher than those of unmodified silica gel under dry and humid conditions, respectively.The sequestration of captured CO2 is the other key aspect of CCS. Enhanced natural gas production in gas shale formations using captured CO2 may help offset the costs associated with CCS. While many questions exist regarding the viability of shale reservoirs for CO2 storage, the interaction of CO2 at the pore scale should be determined due to the heterogeneity of shale. Three shale samples were chosen for pore analysis using the Quantachrome Autosorb iQ2 instrument. The three shale reservoirs are: Haynesville, Barnett and Eagle Ford. The average pore size for each of the 3 shale reservoirs was approximately 4 to 5 nm, although the Haynesville sample had significant pore volume below 4 nm, more so than the other samples. The majority of all pore volume is found below 10 nm, specifically between 4 and 8 nm. Only the Haynesville sample had a high level of pore volume in the classical micropore range (< 2 nm).

Novel carbon capture and sequestration: Biomimetic solid sorbents and gas shale analysis

246th National Meeting (2013)

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