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题名: On CH4 decomposition during separation from H-2 mixtures with thin Pd membranes
作者: Li, Hui1;  Goldbach, Andreas1;  Li, Wenzhao1;  Xu, Hengyong1
关键词: Pd membrane deactivation ;  hydrogen extraction limit ;  methane decomposition ;  palladium carbide ;  surface carbon
刊名: JOURNAL OF MEMBRANE SCIENCE
发表日期: 2008-10-31
DOI: 10.1016/j.memsci.2008.06.056
卷: 324, 期:1-2, 页:95-101
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Technology ;  Physical Sciences
类目[WOS]: Engineering, Chemical ;  Polymer Science
研究领域[WOS]: Engineering ;  Polymer Science
英文摘要: The influence of high CH4 concentrations (8-31%) on the H-2 permeation through a 2 mu m thick Pd membrane was investigated between 473 and 823 K at 100 kPa pressure difference at the maximum H-2 extraction limit, with the retentate H-2 concentration always staying above 50%. The permeate flux was slightly higher in CH4/H-2 mixtures than in equimolar N-2/H-2 mixtures. This is attributed to decomposition of CH4 on the Pd surface as indicated by trace amounts of C2H6. At 723 K and below H-2 permeation remained stable during 6 h experiments in CH4/H-2 mixtures, whereas it gradually decreased with time above that threshold. TPO, SEM and XRD revealed several types of carbon forming on the surface of membrane pieces during exposure to pure CH4. Following CH4 treatment below 723 K two types of carbon deposits were found, which are designated as carbidic carbon and disordered carbon aggregates. Carbonaceous filaments were observed after CH4 exposure above 723 K and graphite platelets after treatment at 823 K. Furthermore, metastable Pd0.9C0.1 and/or Pd0.85C0.15 phases were detected after CH4 treatment at 573, 623, and 773 K. Carbidization of the membrane was most severe at 623 K, but the carbides could be readily decomposed by heat treatment in N-2 between 623 and 723 K. Mechanisms for deactivation of the Pd membrane during separation of CH4/H-2 mixtures at elevated temperatures are discussed. (C) 2008 Elsevier B.V. All rights reserved.
关键词[WOS]: PALLADIUM MEMBRANE ;  HYDROGEN PERMEABILITY ;  ALLOY MEMBRANES ;  PD(111) SURFACE ;  METHANE ;  CARBON ;  TEMPERATURES ;  REACTOR ;  TRANSFORMATION ;  CHEMISORPTION
语种: 英语
WOS记录号: WOS:000259792000011
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140788
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:
Li, Hui,Goldbach, Andreas,Li, Wenzhao,et al. On CH4 decomposition during separation from H-2 mixtures with thin Pd membranes[J]. JOURNAL OF MEMBRANE SCIENCE,2008,324(1-2):95-101.
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