Effect of oxygen addition on catalytic performance of Ni/SiO2•MgO toward carbon dioxide reforming of methane under periodic operation

被引:38
作者
Assabumrungrat, S. [1 ]
Charoenseri, S. [1 ]
Laosiripojana, N. [2 ]
Kiatkittipong, W. [3 ]
Praserthdam, P. [1 ]
机构
[1] Chulalongkorn Univ, Fac Engn, Dept Chem Engn, Ctr Excellence Catalysis & Catalyt React Engn, Bangkok 10330, Thailand
[2] King Mongkuts Univ Technol Thonburi, Joint Grad Sch Energy & Environm, Bangkok 10140, Thailand
[3] Silpakorn Univ, Fac Engn & Ind Technol, Dept Chem Engn, Nakhon Pathom 73000, Thailand
关键词
Coke; Dry reforming; Hydrogen production; Periodic operation; FLUIDIZED-BED REACTOR; HYDROGEN-PRODUCTION; SYNTHESIS GAS; SYNGAS PRODUCTION; DIRECT CRACKING; NICKEL; CO2; DEACTIVATION; STABILITY; NI/SIO2;
D O I
10.1016/j.ijhydene.2009.05.128
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
This work investigates the catalytic performance of an industrial steam reforming Ni/SiO2 center dot MgO catalyst toward dry reforming of CH4 under periodic operation. The effects of cracking/regeneration temperatures and O-2 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 O-2 addition, the catalyst showed good stability at 650 degrees C but observed high deactivation at 750 degrees C due to the formation of encapsulating carbon. The addition of O-2 along with CO2 can eliminate all deactivation at 750 degrees C 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 degrees C with CO2/O-2 ratio of 7/3. (C) 2009 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:6211 / 6220
页数:10
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