Abstract
It is widely proposed that the global warming is mainly caused by the increase in of carbon dioxide (CO 2) content in the atmosphere, and that fossil fuels are the dominant sources of this CO 2. Therefore, the quality of fossil fuels tends to be evaluated by amounts of CO 2 emissions. For the evaluation of an oil shale from this point, an on-line thermogravimetric-gas chromatographic system was used to measure CO 2 evolution profiles on temperature with a small oil shale sample. This method makes possible to estimate the amounts of CO 2 evolved from kerogen and carbonates in retorting and those from carbonates in combustion, respectively. These results will be basic data for a novel oil shale retorting process for the control of CO 2 emissions. The profiles for Thai and Colorado oil shales have shown CO 2 mainly evolved by the pyrolysis of kerogen below 550°C, and that evolved by the decomposition of carbonates above that temperature. On the other hand, the profile for Condor oil shale showed that most carbonates decomposed below 550°C, while only small amounts of carbonates decomposed above this temperature.
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