Effect of oxygen addition on catalytic performance of Ni/SiO2ทMgO toward carbon dioxide reforming of methane under periodic operation
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Author list: Assabumrungrat S., Charoenseri S., Laosiripojana N., Kiatkittipong W., Praserthdam P.
Publisher: Elsevier
Publication year: 2009
Journal: International Journal of Hydrogen Energy (0360-3199)
Volume number: 34
Issue number: 15
Start page: 6211
End page: 6220
Number of pages: 10
ISSN: 0360-3199
Languages: English-Great Britain (EN-GB)
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Abstract
This work investigates the catalytic performance of an industrial steam reforming Ni/SiO2ทMgO catalyst toward dry reforming of CH4 under periodic operation. The effects of cracking/regeneration temperatures and O2 addition during regeneration on the catalyst stability and activity were determined and various characterizations i.e. BET, SEM, XRD, and TPO were employed to relate the catalyst performance with its physical properties. It was found that, without O2 addition, the catalyst showed good stability at 650 ฐC but observed high deactivation at 750 ฐC due to the formation of encapsulating carbon. The addition of O2 along with CO2 can eliminate all deactivation at 750 ฐC and no significant loss of catalyst activity was observed for at least 12 cracking/regeneration cycles. The optimal performance for periodic operation was found at the condition with 5 min of the cracking step followed by 5 min of the regeneration step at 750 ฐC with CO2/O2 ratio of 7/3. ฉ 2009 International Association for Hydrogen Energy.
Keywords
Coke, Dry reforming, Periodic operation
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