Isotopic studies of Sn-Cr binary oxide catalysts for methane total oxidation
Zhu, YX; Murwani, IK; Zhou, CJ; Kemnitz, E; Xie, YC
AbstractA series of Sn-Cr binary oxide catalysts were prepared by a co-current co-precipitation method and tested for methane total oxidation. The binary oxide catalysts have much higher surface areas and catalytic activities for methane oxidation than pure SnO2. CrOx/SnO2 with a Cr/Sn atomic ratio of 3:7 displays the highest activity. Selected samples were subjected to temperature-programmed O-18 isotope-exchange measurements. Both complete and partial heteromolecular O-18 isotope exchange, as well as oxygen release, was observed for all catalysts. Reaction between CH4 and O-18(2) under static conditions was performed to investigate the reaction mechanism and it was found that the total oxidation of methane over Sn-Cr binary oxide catalysts occurs via a redox cycle with the chromium ion in a high oxidation state as the active center. Oxygen mobility of the catalyst plays an important role in the total oxidation of methane, but too high a mobility leads to very high oxygen release and a reduction of the surface reoxidability. This causes a decrease in the catalytic oxidation activity.
KeywordO-18 Isotope Exchange Sn-cr Binary Oxide Methane Total Oxidation
Indexed BySCI
WOS IDWOS:000180652000013
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Document Type期刊论文
Corresponding AuthorZhu, YX
Affiliation1.Peking Univ, Coll Chem & Mol Engn, State Key Lab Struct Chem Unstable & Stable Speci, Beijing 100871, Peoples R China
2.Humboldt Univ, Inst Chem, D-12489 Berlin, Germany
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GB/T 7714
Zhu, YX,Murwani, IK,Zhou, CJ,et al. Isotopic studies of Sn-Cr binary oxide catalysts for methane total oxidation[J]. CATALYSIS LETTERS,2003,85(3-4):205-211.
APA Zhu, YX,Murwani, IK,Zhou, CJ,Kemnitz, E,&Xie, YC.(2003).Isotopic studies of Sn-Cr binary oxide catalysts for methane total oxidation.CATALYSIS LETTERS,85(3-4),205-211.
MLA Zhu, YX,et al."Isotopic studies of Sn-Cr binary oxide catalysts for methane total oxidation".CATALYSIS LETTERS 85.3-4(2003):205-211.
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