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Effects of CO and CO2 on the Removal of Elemental Mercury over Carbonaceous Surfaces by Zhou, Qixin (author);Zhou, Jinsong (author);Cao, Hui (author);Xu, Xinyu (author) is a Engineering article available to read on EtoBox.

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Coal gasification is a popular method for the optimization of coal utilization and the reduction of environmental pollutant emissions. However, the reductive atmosphere of its products is disadvantageous for removing elemental mercury (Hg 0 ). Activated cokes (AC) was employed in this work for mercury capture in a reducing atmosphere. The high-temperature heating decreases the mercury-removal capability of carbon sorbents because the carbonaceous surface is becoming oxygendepleted and micropore-decreased after the heating treatment. The mechanism of mercury adsorption in pure nitrogen follows the Mars-Maessen mechanism over the carbon sorbents. To identify the effects of carbon monoxide (CO) and carbon dioxide (CO 2 ) on Hg 0 removal, the Hg 0 -adsorption and thermal desorption experiments were carried in a fixed-bed reaction system. CO inhibits both the chemisorption and physisorption of Hg 0 . CO 2 competes for the active sites, lactone groups and hydroxyl groups, and occupies the micropores, which is beneficial to adsorb Hg 0 physically. When CO and CO 2 coexisted, the removal efficiencies show steadier than those in monocomponent gas (only CO or CO 2 ). CO 2 can resist the nega

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Author

Zhou, Qixin (author);Zhou, Jinsong (author);Cao, Hui (author);Xu, Xinyu (author)

Publisher

American Chemical Society (ACS)

Published

2021

Language

EN

Field

Engineering (Physical Sciences)