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首页> 外文期刊>Applied Surface Science >A comparative study of CeO_2-Al_2O_3 support prepared with different methods and its application on MoO_3/CeO_2-Al_2O_3 catalyst for sulfur-resistant methanation
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A comparative study of CeO_2-Al_2O_3 support prepared with different methods and its application on MoO_3/CeO_2-Al_2O_3 catalyst for sulfur-resistant methanation

机译：不同方法制备的CeO_2-Al_2O_3载体的比较研究及其在MoO_3 / CeO_2-Al_2O_3耐硫甲烷化催化剂上的应用

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摘要

The CeO_2-Al_2O_3 supports prepared with impregnation (IM), deposition precipitation (DP), and solution combustion (SC) methods for MoO_3/CeO_2-Al_2O_3 catalyst were investigated in the sulfur-resistant methanation. The supports and catalysts were characterized by N_2-physisorption, transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman spectroscopy (RS), and temperature-programmed reduction (TPR). The N_2-physisorption results indicated that the DP method was favorable for obtaining better textural properties. The TEM and RS results suggested that there is a CeO_2 layer on the surface of the support prepared with DP method. This CeO_2 layer not only prevented the interaction between MoO_3 and γ-Al_2O_3 to form Al_2(MoO_4)_3 species, but also improved the dispersion of MoO_3 in the catalyst. Accordingly, the catalysts whose supports were prepared with DP method exhibited the best catalytic activity. The catalysts whose supports were prepared with SC method had the worst catalytic activity. This was caused by the formation of Al_2MoO_4)_3 and crystalline MoO_3. Additionally, the CeO_2 layer resulted in the instability of catalysts in reaction process. The increasing of calcination temperature of supports reduced the catalytic activity of all catalysts. The decrease extent of the catalysts whose supports were prepared with DP method was the lowest as the CeO_2 layer prevented the interaction between MoO_3 and γ-Al_2O_3.
机译：在耐硫甲烷化反应中，研究了用浸渍法（IM），沉积沉淀法（DP）和固溶燃烧（SC）方法制备的MoO_3 / CeO_2-Al_2O_3催化剂的CeO_2-Al_2O_3载体。通过N_2-物理吸附，透射电子显微镜（TEM），X射线衍射（XRD），拉曼光谱（RS）和程序升温还原（TPR）对载体和催化剂进行了表征。 N_2的物理吸附结果表明，DP法有利于获得更好的织构性能。 TEM和RS结果表明，用DP法制备的载体表面存在CeO_2层。该CeO_2层不仅阻止了MoO_3与γ-Al_2O_3之间的相互作用形成Al_2（MoO_4）_3，而且还提高了MoO_3在催化剂中的分散性。因此，用DP法制备载体的催化剂表现出最好的催化活性。用SC法制备载体的催化剂的催化活性最差。这是由于形成Al_2MoO_4）_3和结晶MoO_3引起的。另外，CeO_2层导致反应过程中催化剂的不稳定性。载体煅烧温度的升高降低了所有催化剂的催化活性。 CeO_2层阻止了MoO_3与γ-Al_2O_3的相互作用，DP法制备的催化剂的还原程度最低。

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  • 来源
    《Applied Surface Science》 |2013年第ptab期|267-277|共11页
  • 作者

    Minhong Jiang; Baowei Wang; Yuqin Yao; Zhenhua Li; Xinbin Ma; Shaodong Qin; Qi Sun;

  • 作者单位

    Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;

    Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;

    Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;

    Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;

    Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China,Xinbin Ma, School of Chemical Engineering and Technology, Tianjin University,Tianjin 300072, China;

    National Institute of Clean-and-Low-Carbon Energy, Beijing 102209, China;

    National Institute of Clean-and-Low-Carbon Energy, Beijing 102209, China;

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  • 正文语种 eng
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  • 关键词

    CeO_2-Al_2O_3 support; Preparation method; MoO_3/CeO_2-Al_2O_3; Catalytic activity; Sulfur-resistant methanation;

    机译：CeO_2-Al_2O_3支持;制备方法;MoO_3 / CeO_2-Al_2O_3;催化活性;耐硫甲烷化;

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