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Mo–V–O nanocrystals synthesized in the confined space of a mesoporous carbon
Applied Catalysis A: General ( IF 5.5 ) Pub Date : 2021-07-24 , DOI: 10.1016/j.apcata.2021.118294
Ryo Obunai 1 , Keisuke Tamura 1 , Isao Ogino 1 , Shin R. Mukai 1 , Wataru Ueda 2
Affiliation  

Ternary Mo–V oxide nanocrystals (Nano-MoVO) were hydrothermally synthesized in the confined space of a mesoporous carbon template and tested in the oxidative dehydrogenation (ODH) of ethane and propane. The synthesized nanocrystals are approximately 60 nm in length, 20 nm in diameter on average, and possess a structure resembling orthorhombic MoVO (Orth-MoVO) as indicated by spectroscopic and microscopy characterization. The Nano-MoVO catalyst has a 5-fold higher mesopore volume and a 4-fold larger external surface area than an Orth-MoVO synthesized by a conventional method (Orth-MoVO) as characterized through N2 adsorption analysis. Nano-MoVO shows similar activation energy in the ODH of ethane compared with other conventional MoVO catalysts. However, Nano-MoVO exhibits significantly higher propane/ethane activation rate ratio and higher propene selectivity even in the absence of elements such as Te and Nb that suppress overoxidation of propane-derived species to COx. The results suggest the benefits of the nanocrystalline morphology to limit overoxidation.



中文翻译:

在介孔碳的密闭空间中合成的 Mo-V-O 纳米晶体

在介孔碳模板的密闭空间中水热合成了三元 Mo-V 氧化物纳米晶体 (Nano-MoVO),并在乙烷和丙烷的氧化脱氢 (ODH) 中进行了测试。合成的纳米晶体长度约为 60 nm,平均直径为 20 nm,并且具有类似于正交 MoVO (Orth-MoVO) 的结构,如光谱和显微镜表征所示。Nano-MoVO 催化剂具有比通过常规方法合成的 Orth-MoVO (Orth-MoVO) 高 5 倍的中孔体积和 4 倍的外表面积,其特征在于 N 2吸附分析。与其他传统 MoVO 催化剂相比,纳米 MoVO 在乙烷的 ODH 中显示出相似的活化能。然而,即使在不存在抑制丙烷衍生物质过度氧化成 CO x的元素如 Te 和 Nb 的情况下,Nano-MoVO 也表现出显着更高的丙烷/乙烷活化率比和更高的丙烯选择性。结果表明纳米晶体形态有利于限制过氧化。

更新日期:2021-08-19
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