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Evaluation of CO (sub 2) sorption capacity of granite for CO (sub 2) geological sequestration



Evaluation of CO (sub 2) sorption capacity of granite for CO (sub 2) geological sequestration



AIP Conference Proceedings 898: 79-83



Anthropogenic effects on climate can be mitigated through various measures. Among them being CO (sub 2) sequestration into geological reservoirs including deep saline aquifers, depleted oil/gas reservoirs and coal seams are interested in a powerful means for drastically reducing emissions of CO (sub 2) . When CO (sub 2) would be injected into geological reservoir, it should be necessary to know the potential of CO (sub 2) storing into the reservoir. In this study, amount of CO (sub 2) sorption of granite was to evaluate experimentally at temperatures 50, 70, 100 and 200 degrees C and pressure up to 20 MPa using a magnetic suspension balance (MSB), which allows to measure under supercritical condition. As a result, we confirmed that the granite have the potential of CO (sub 2) sorption. Sorption isotherms obtained from the MSB experiment showed that amount of CO (sub 2) sorption increased with the increasing pressure and decreased with the increasing temperature for all experimental conditions. Especially, amount of CO (sub 2) sorption at 50 degrees C compared with that at other temperatures (70, 100 and 200 degrees C) increased rapidly in the vicinity of the critical state. In addition, the granite showed a maximum of CO (sub 2) sorption into granite could reach up to about 1.0% by weight at 50 degrees C and 14.4 MPa. The present results may provide a fundamental knowledge for the development of CO (sub 2) geological sequestration technology.

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