Relationship between the Conductivities of CeO2-ZrO2-MOx (M = Bi, Ca, Sn, Ni, Fe) Solid Solutions and Catalytic Activities during Methane Oxidation
Relationship between the Conductivities of CeO2-ZrO2-MOx (M = Bi, Ca, Sn, Ni, Fe) Solid Solutions and Catalytic Activities during Methane Oxidation
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DOI：
10.1246/bcsj.20170274
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发表时间：
2018-02
影响因子：
4
通讯作者：
Minchan Jeong;Naoyoshi Nunotani;N. Imanaka
中科院分区：
文献类型：
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作者：
Minchan Jeong;Naoyoshi Nunotani;N. Imanaka
我们研究了CeO2-ZrO2-MOx（M = Bi、Ca、Sn、Ni、Fe）固溶体的电导率与CeO2-ZrO2-MOx/γ-Al2O3载体上PdO组成的催化剂催化能力之间的关系。 CeO2-ZrO2-MOx促进剂的氧化物离子电导率随着氧空位浓度的增加而增加，并且这些促进剂的电子电导率通过掺杂Sn4+/2+、Ni3+/2+和Fe3+/2+而显着增强，所有这些都容易发生价态变化。对CeO2-ZrO2-MOx/γ-Al2O3样品的氧释放特性的研究发现，从氢程序升温还原数据获得的还原温度主要由促进剂的电子电导率决定，而不是由氧化物离子电导率决定。然而，每个CeO2-ZrO2-MOx/γ-Al2O3样品的储氧能力与氧化物离子电导率和电子电导率有关。这些材料的催化甲烷氧化活性明显受到影响...
We investigated the relationship between the conductivities of CeO2-ZrO2-MOx (M = Bi, Ca, Sn, Ni, Fe) solid solutions and the catalytic abilities of catalysts composed of PdO on CeO2-ZrO2-MOx/γ-Al2O3 supports. The oxide-ionic conductivities of the CeO2-ZrO2-MOx promoters increased with increasing oxygen vacancy concentrations and the electronic conductivities of these promoters were significantly enhanced by doping with Sn4+/2+, Ni3+/2+ and Fe3+/2+, all of which readily undergo valency changes. Studies of the oxygen release characteristics of CeO2-ZrO2-MOx/γ-Al2O3 samples found that the reduction temperatures obtained from hydrogen temperature programmed reduction data were primarily determined by the electronic conductivity of the promoter rather than by the oxide-ionic conductivity. However, the oxygen storage capacity of each CeO2-ZrO2-MOx/γ-Al2O3 sample was related to both the oxide-ionic and electronic conductivities. The catalytic methane oxidation activities of these materials were evidently affect...