Effect of Steam on the Reactivity of MgO-Based Sorbents in Precombustion CO sub(2) Capture Processes

Low-cost MgO-based sorbents were prepared through modification of natural dolomite and were found to be capable of capturing CO sub(2) from coal gas at elevated temperatures and pressures (i.e., 330 degree < T < 450 degree C and P > 20 bar). The effect of steam on the reactivity of the MgO...

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Bibliographic Details
Published inIndustrial & engineering chemistry research Vol. 54; no. 36; pp. 8860 - 8866
Main Authors Zarghami, Shahin, Hassanzadeh, Armin, Arastoopour, Hamid, Abbasian, Javad
Format Journal Article
LanguageEnglish
Published 16.09.2015
Subjects
Carbon capture and storage
Carbon dioxide
Carbonation
Diffusion
Dolomite
Formations
Magnesium oxide
Sorbents
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Summary:Low-cost MgO-based sorbents were prepared through modification of natural dolomite and were found to be capable of capturing CO sub(2) from coal gas at elevated temperatures and pressures (i.e., 330 degree < T < 450 degree C and P > 20 bar). The effect of steam on the reactivity of the MgO sorbents was investigated experimentally. The results indicate that the presence of steam significantly improves the overall rate of the carbonation reaction through two different mechanisms. The presence of steam improves the intrinsic rate of the carbonation reaction by altering the carbonation reaction pathway through the formation of more reactive transient MgO.H sub(2)O super( times )/Mg(OH) sub(2) super( times ) intermediate compounds. The formation of the transient intermediate compounds with larger molar volume (compared with MgO) results in the expansion of the inner pores, which lowers diffusion resistance to the reactant gas (i.e., CO sub(2)) during carbonation.
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ISSN:0888-5885
1520-5045
DOI:10.1021/acs.iecr.5b01175