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首页> 外文期刊>Environmental Science & Technology >Roles of Li~+ and Zr~(4+) Cations in the Catalytic Performances of Co~(1-x)M_xCr_2O_4 (M = Li, Zr; x = 0-0.2) for Methane Combustion
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Roles of Li~+ and Zr~(4+) Cations in the Catalytic Performances of Co~(1-x)M_xCr_2O_4 (M = Li, Zr; x = 0-0.2) for Methane Combustion

机译：Li〜+和Zr〜（4+）阳离子在Co〜（1-x）M_xCr_2O_4（M = Li，Zr; x = 0-0.2）催化甲烷燃烧性能中的作用

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摘要

Co_(1-x)M_xCr_2O_4 (M = Li, Zr; x = 0-0.2) catalysts were prepared via the citric acid method and investigated for catalytic combustion of methane. Substitution at tetrahedral (A) sites with monovalent (Li) or tetravalent (Zr) metal ions led to a decrease or increase of the catalytic activity, respectively. The Co0.095Zr0.05Cr_2O_4 catalyst proved to be the most active and its catalytic activity reached 90% of methane conversion at 448 °C, which dropped by 66 °C compared with that of the undoped CoCr_2O_4 catalyst XRD and Raman results indicated that lithium or zirconium substitution could modify the spinel structure and electronic properties. For lithium-doped catalysts, oxygen deficiency and a strong surface enrichment in lithium and chromium were detected. Zirconium substitution enhanced the redudbility of zirconium-doped catalysts and decreased die strength constant of both the Co—O band and the Cr—O band, which may contribute to the catalytic activity toward methane combustion. In addition, the prevalent catalytic combustion activity of the zirconium-substituted catalysts could be explained by their higher concentration of suprafariaL weakly chemisorbed oxygen.
机译：通过柠檬酸法制备了Co_（1-x）M_xCr_2O_4（M = Li，Zr; x = 0-0.2）催化剂，并研究了甲烷的催化燃烧。在四面体（A）位置被一价（Li）或四价（Zr）金属离子取代分别导致催化活性的降低或增加。事实证明，Co0.095Zr0.05Cr_2O_4催化剂活性最高，在448°C时其催化活性达到甲烷转化率的90％，与未掺杂CoCr_2O_4催化剂相比，XRD降低了66°C。锆取代可以改变尖晶石的结构和电子性能。对于掺杂锂的催化剂，检测到氧缺乏以及锂和铬的强表面富集。锆取代增强了锆掺杂催化剂的可还原性，并降低了Co-O带和Cr-O带的模头强度常数，这可能有助于甲烷燃烧的催化活性。另外，锆取代的催化剂的普遍催化燃烧活性可以通过其较高浓度的草莓草酸弱化学吸附的氧气来解释。

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  • 来源
    《Environmental Science & Technology》 |2011年第19期|p.8491-8497|共7页
  • 作者

    Jinghuan Chen; Wenbo Shi; Xueying Zhang; Hamidreza Arandiyan; Dongfang Li; Junhua Li;

  • 作者单位

    School of Environment, Tsinghua University, Beijing 100084, China;

    School of Environment, Tsinghua University, Beijing 100084, China;

    School of Environment, Tsinghua University, Beijing 100084, China;

    School of Environment, Tsinghua University, Beijing 100084, China;

    School of Environment, Tsinghua University, Beijing 100084, China;

    School of Environment, Tsinghua University, Beijing 100084, China,State Key Joint Laboratory of Environment Simulation and Pollution Control (SKLESPC), Beijing 100084, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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