CO2 capture from syngas via cyclic carbonation/calcination for a naturally occurring limestone: Modelling and bench-scale testing |
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Authors: | Robert T Symonds Arturo Macchi Edward J Anthony |
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Affiliation: | a CANMET Energy Technology Centre-Ottawa, Natural Resources Canada, 1 Haanel Drive, Ottawa, Canada K1A 1M1 b Department of Chemical Engineering, University of Ottawa, 550 Cumberland Street, Ottawa, Canada K1N 6N5 |
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Abstract: | The intrinsic rate constants of the CaO-CO2 reaction, in the presence of syngas, were studied using a grain model for a naturally occurring calcium oxide-based sorbent using a thermogravimetric analyzer. Over temperatures ranging from 580 to 700 °C, it was observed that the presence of CO and H2 (with steam) during carbonation caused a significant increase in the initial rate of carbonation, which has been attributed to the CaO surface sites catalyzing the water-gas shift reaction, increasing the local CO2 concentration. The water-gas shift reaction was assumed to be responsible for the increase in activation energy from 29.7 to 60.3 kJ/mol for limestone based on the formation of intermediate complexes. Changes in microporosity due to particle sintering during calcination have been credited with the rapid initial decrease in cyclic CaO maximum conversion for limestone particles, whereas the presence of steam during carbonation has been shown to improve the long-term maximum conversion in comparison to previous studies without steam present. |
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Keywords: | _method=retrieve& _eid=1-s2 0-S000925090900298X& _mathId=si4 gif& _pii=S000925090900298X& _issn=00092509& _acct=C000054348& _version=1& _userid=3837164& md5=c261760202d3d60f525996410e0ba87e')" style="cursor:pointer CO2 capture" target="_blank">" alt="Click to view the MathML source" title="Click to view the MathML source">CO2 capture Gasification syngas Ca-sorbent looping Calcination-carbonation cycle Modelling |
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