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On CH4 decomposition during separation from H-2 mixtures with thin Pd membranes
Li, Hui; Goldbach, Andreas; Li, Wenzhao; Xu, Hengyong
KeywordPd Membrane Deactivation Hydrogen Extraction Limit Methane Decomposition Palladium Carbide Surface Carbon
Source PublicationJOURNAL OF MEMBRANE SCIENCE
2008-10-31
DOI10.1016/j.memsci.2008.06.056
Volume324Issue:1-2Pages:95-101
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology ; Technology ; Physical Sciences
WOS SubjectEngineering, Chemical ; Polymer Science
WOS Research AreaEngineering ; Polymer Science
WOS KeywordPALLADIUM MEMBRANE ; HYDROGEN PERMEABILITY ; ALLOY MEMBRANES ; PD(111) SURFACE ; METHANE ; CARBON ; TEMPERATURES ; REACTOR ; TRANSFORMATION ; CHEMISORPTION
AbstractThe 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.
Language英语
WOS IDWOS:000259792000011
Citation statistics
Cited Times:19[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/140788
Collection中国科学院大连化学物理研究所
AffiliationChinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
Recommended Citation
GB/T 7714
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.
APA Li, Hui,Goldbach, Andreas,Li, Wenzhao,&Xu, Hengyong.(2008).On CH4 decomposition during separation from H-2 mixtures with thin Pd membranes.JOURNAL OF MEMBRANE SCIENCE,324(1-2),95-101.
MLA Li, Hui,et al."On CH4 decomposition during separation from H-2 mixtures with thin Pd membranes".JOURNAL OF MEMBRANE SCIENCE 324.1-2(2008):95-101.
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