Reactivity of Ni/SiO2ทMgO toward carbon dioxide reforming of methane under steady state and periodic operations
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Publication Details
Author list: Pholjaroen B., Laosiripojana N., Praserthdam P., Assabumrungrat S.
Publisher: Elsevier
Publication year: 2009
Journal: Journal of Industrial and Engineering Chemistry (1226-086X)
Volume number: 15
Issue number: 4
Start page: 488
End page: 497
Number of pages: 10
ISSN: 1226-086X
Languages: English-Great Britain (EN-GB)
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Abstract
The carbon dioxide reforming of methane over commercial Ni/SiO2ทMgO catalyst under periodic and steady state operations was investigated at a temperature range of 650-750 ฐC. Under steady state operation, methane conversions tended to be constant with reaction time but increased with increasing reaction temperature. It was then observed that at low temperature (650 ฐC) under the periodic operation, methane conversion was also constant at approximately 48% throughout reaction time, but for the operation at a higher temperature, i.e. 750 ฐC, higher methane conversion (about 67%) was initially achieved but decreased dramatically with reaction time (to 27% in 240 min). The reason for the catalyst deactivation particularly for the periodic operation was further investigated by TPO, BET and XRD. It is suggested that at different operating temperatures, various types of coke occurred on the surface of catalyst and affected the catalytic activity. ฉ 2009 The Korean Society of Industrial and Engineering Chemistry.
Keywords
Coke, Dry reforming, Periodic operation
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