1 Ocak 2013 Dergi makalesi Açık Erişim

Vu Thi Thu Ha; Sarioglan, Alper; Erdem-Senatalar, Ayse; Ben Taarit, Younes

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        "affiliation": "Inst Rech Catalyse, CNRS, F-69626 Villeurbanne, France", 
        "name": "Vu Thi Thu Ha"
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        "affiliation": "TUBITAK Marmara Res Ctr, Energy Inst, TR-41470 Gebze, Kocaeli, Turkey", 
        "name": "Sarioglan, Alper"
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      {
        "affiliation": "Istanbul Tech Univ, Dept Chem Engn, TR-34469 Istanbul, Turkey", 
        "name": "Erdem-Senatalar, Ayse"
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        "affiliation": "Inst Rech Catalyse, CNRS, F-69626 Villeurbanne, France", 
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    "description": "EPR and Al-27 NMR were used to probe the nature of the phases that formed during the conversion of methane at high temperature on the Mo/HZSM-5 catalyst. It was shown that ammonium 6-molybdoaluminate III supported over silica gave rise, when reduced, to an EPR signal due to Mo5+ ions with the odd electron interacting with the nonzero nuclear spin of aluminum in much the same way as in HZSM-5. Therefore, the occurrence of this particular spin interaction should not be taken as evidence of the location of the Mo5+ ions at the exchange sites of the zeolites. Rather, combined Al-27 NMR and EPR investigation of the reduction of a pure polycrystalline aluminum molybdate suggested that the observed signal in the case of the zeolite composite catalyst was due to Mo5+ ions formed within the Al-2(MoO4)(3) extra phase that formed upon dealumination of the zeolite in the presence of molybdenum. (c) 2013 Elsevier B.V. All rights reserved.", 
    "doi": "10.1016/j.molcata.2013.06.020", 
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      "pages": "279-284", 
      "title": "JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL", 
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    "title": "An EPR and NMR study on Mo/HZSM-5 catalysts for the aromatization of methane: Investigation of the location of the pentavalent molybdenum"
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