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题名: Study on oxidative coupling of methane in oxygen permeable tubular membrane reactor
作者: Wang, HH;  Cong, Y;  Yang, WS;  Lin, LW
关键词: perovskite ;  oxygen separation membrane ;  methane ;  oxidative coupling ;  membrane reactor
刊名: CHINESE JOURNAL OF CATALYSIS
发表日期: 2003-03-01
卷: 24, 期:3, 页:169-174
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Applied ;  Chemistry, Physical ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: Mixed-conducting oxygen permeable membrane is a kind of ceramic membrane, which exhibits both electronic and oxygen ionic conductivity. At high temperature, oxygen can permeate through the membrane in the form of oxygen ions. So on the membrane surface, there are many oxygen species (O-, O-2(-), O-2(2-) and O-2(-)), which can improve C-2 selectivity of oxidative coupling of methane (OCM). A dense tubular membrane made of Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCFO) was prepared by the plastic extrusion method. OCM was investigated in the tubular membrane reactor. C-2 production rate in the BSCFO membrane reactor is much higher than that in La0.6Sr0.4Co0.8Fe0.2O3-delta ( LSCFO) and La-Ba-Co-Fe-O (LBCFO) membrane reactors. The reason is that the vacancy concentration in the BSCFO is higher than that in the LSCFO and LBCFO. The higher vacancy concentration not only accelerates the diffusion rate of oxygen ion but also increases the activation rate of methane. So the BSCFO is more active for OCM than the LSCFO and LBCFO. The C-2 production rate increases with the increase of temperature and methane concentration in the feed. However, the C-2 selectivity is determined by the competitive result of oxygen ion recombination and OCM reaction. High rate of oxygen ion recombination will decrease the C-2 selectivity. The methane conversion increases while C-2 selectivity decreases with the increase of oxygen partial pressure in the oxygen-rich side. This result indicates that the gas-phase reaction plays an important role in the OCM reaction. There is a large amount of O-2 in the products which results in the modest increase of the oxygen permeation flux, compared with the case of air/He.
关键词[WOS]: DOPED BISMUTH OXIDE ;  CATALYSTS ;  CONVERSION ;  TRANSIENT ;  MGO
语种: 英语
WOS记录号: WOS:000182347400004
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138319
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Liaoning, Peoples R China

Recommended Citation:
Wang, HH,Cong, Y,Yang, WS,et al. Study on oxidative coupling of methane in oxygen permeable tubular membrane reactor[J]. CHINESE JOURNAL OF CATALYSIS,2003,24(3):169-174.
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