Promotion of CO sub(2) methanation activity and CH sub(4) selectivity at low temperatures over Ru/CeO sub(2)/Al sub(2)O sub(3) catalysts

The effect of CeO sub(2) loading amount of Ru/CeO sub(2)/Al sub(2)O sub(3) on CO sub(2) methanation activity and CH sub(4) selectivity was studied. The CO sub(2) reaction rate was increased by adding CeO sub(2) to Ru/Al sub(2)O sub(3), and the order of CO sub(2) reaction rate at 250 degree C is Ru/3...

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Bibliographic Details
Published in:International journal of hydrogen energy 2014-06, Vol.39 (19), p.10090-10100
Main Authors: Tada, Shohei, Ochieng, Ochieng James, Kikuchi, Ryuji, Haneda, Takahide, Kameyama, Hiromichi
Format: Article
Language:English
Subjects:
Aluminum oxide
Carbon dioxide
Carbon monoxide
Catalysis
Catalysts
Hydrogen-based energy
Methanation
Selectivity
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Summary:The effect of CeO sub(2) loading amount of Ru/CeO sub(2)/Al sub(2)O sub(3) on CO sub(2) methanation activity and CH sub(4) selectivity was studied. The CO sub(2) reaction rate was increased by adding CeO sub(2) to Ru/Al sub(2)O sub(3), and the order of CO sub(2) reaction rate at 250 degree C is Ru/30%CeO sub(2)/Al sub(2)O sub(3) > Ru/60%CeO sub(2)/Al sub(2)O sub(3) > Ru/CeO sub(2) > Ru/Al sub(2)O sub(3). With a decrease in CeO sub(2) loading of Ru/CeO sub(2)/Al sub(2)O sub(3) from 98% to 30%, partial reduction of CeO sub(2) surface was promoted and the specific surface area was enlarged. Furthermore, it was observed using FTIR technique that intermediates of CO sub(2) methanation, such as formate and carbonate species, reacted with H sub(2) faster over Ru/30%CeO sub(2)/Al sub(2)O sub(3) and Ru/CeO sub(2) than over Ru/Al sub(2)O sub(3). These could result in the high CO sub(2) reaction rate over CeO sub(2)-containing catalysts. As for the selectivity to CH sub(4), Ru/30%CeO sub(2)/Al sub(2)O sub(3) exhibited high CH sub(4) selectivity compared with Ru/CeO sub(2), due to prompt CO conversion into CH sub(4) over Ru/30%CeO sub(2)/Al sub(2)O sub(3).
ISSN:0360-3199
DOI:10.1016/j.ijhydene.2014.04.133