Emission of volatile
and hazardous trace elements, including selenium
emission from fossil fuel combustion, has become a major environmental
concern. The CaO adsorbent has proved to be highly effective in SeO2 capture. Steam is an important component in flue gas, which
has been fully confirmed to be able to promote the adsorption of CO2 using the CaO adsorbent. Because of the similar structure
of SeO2 and CO2 molecules, the promotion effect
provided by H2O for CO2 adsorption is expected
to behave in a similar way to promote SeO2 adsorption by
CaO. In this study, the promotion effect of steam on SeO2 adsorption was investigated and confirmed by density functional
theory calculation. The superficial OH formed during the decomposition
of H2O greatly promotes SeO2 adsorption.
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