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题名: Ni/alpha-Al2O3 catalyst for the partial oxidation of methane to syngas
作者: Jin, RC;  Chen, YX;  Li, WZ;  Ji, YY;  Qin, YS;  Jiang, Y
关键词: methane ;  syngas ;  nickel ;  promoter
刊名: ACTA PHYSICO-CHIMICA SINICA
发表日期: 1998-08-01
DOI: 10.3866/PKU.WHXB19980813
卷: 14, 期:8, 页:737-741
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: The catalytic performance of Ni/zeta-Al2O3 catalysts with different nickel content was investigated for the partial oxidation of methane to syngas in O-2 at atmospheric pressure and very high space velecity of 5x10(5)h(-1). Optimal CH4 conversion of 91%, CO and H-2 selectivity of 94% and 96%, respectively, were obtained over 8%(mass fraction) Ni catalyst at 800 degrees C. XRD (X-ray Diffraction) analysis indicated that oxidic nickel is the main surface species on Ni/alpha-Al2O3 catalyst calcinated at 800 degrees C under atmosphere. TPR (Temperature Programmed Reduction) suggested a bimodel nature of oxidic nickel that are "fixed" to the support. The "free" oxidic nickel: which is responsible for the serious carbon deposition on catalyst, appeared as the nickel content was increased up to 12%. Promoter effects of lanthanide oxide (CeO2) were also investigated. The results showed that addition of CeO2 was beneficial to CH4 conversion and CO selectivity. An excellant conversion (96.5%) and CO selection (96%) were achieved on NiCe(1%Ce)/alpha-Al2O3, at 500 degrees C with a space velecity of 5x10(5)h(-1). Furthmore, CeO2 significantly improved the stability of nickel under critical reaction conditions. No carbon deposition was found over NiCe(1%Ce)/alpha-Al2O3 after nine hours at 900 degrees C. The promoting mechanism of CeO2 was discussed on the basis of XPS, TPR and XRD results.
关键词[WOS]: ALUMINA COPRECIPITATED CATALYSTS ;  METAL SUPPORT INTERACTIONS ;  SYNTHESIS GAS-FORMATION ;  CERIUM OXIDE ;  PROMOTION ;  PD/LA2O3 ;  PD/SIO2 ;  CO ;  MONOLITHS ;  H-2
语种: 英语
WOS记录号: WOS:000075809200013
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138491
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, Dalian 116023, Peoples R China

Recommended Citation:
Jin, RC,Chen, YX,Li, WZ,et al. Ni/alpha-Al2O3 catalyst for the partial oxidation of methane to syngas[J]. ACTA PHYSICO-CHIMICA SINICA,1998,14(8):737-741.
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