Synthesis of crystalline Mo–V–W–O complex oxides with orthorhombic and trigonal structures and their application as catalysts

Q1 Materials Science Catalysis Structure & Reactivity Pub Date : 2015-01-08 DOI:10.1179/2055075814Y.0000000009
Chuntian Qiu, Chen C Chen, S. Ishikawa, Zhenxin Zhang, T. Murayama, W. Ueda
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引用次数: 3

Abstract

Abstract Crystalline Mo–V–W–O complex oxides with the orthorhombic or trigonal structure were synthesized by a hydrothermal method. Those Mo–V–W–O samples with various amounts of tungsten were characterized by inductively coupled plasma atomic emission spectroscopy, TEM, STEM–EDX, X-ray diffraction, Rietveld analysis, and a N2 adsorption method. It was found for the first case that an additional metal such as W can be successfully incorporated into the trigonal Mo–V–O structure by using (CH3CH2NH3)2Mo3O10.The alkylammonium cation acted as a structural stabilizer that was requisite for the formation of a trigonal structure when additional metal ions were present. For the orthorhombic Mo–V–W–O structure, introduction of W into the orthorhombic structure caused a rod segregation effect by which nanoscale crystals formed and the external surface area greatly increased. Additionally, these Mo–V–W–O materials were applied as catalysts for the gas phase selective oxidation of acrolein to acrylic acid. The best catalyst was assigned to the orthorhombic Mo–V–O–W7.5, which possessed an ordered arrangement of heptagonal and hexagonal channels and a large external surface area.
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正交和三角结构Mo-V-W-O晶体配合氧化物的合成及其催化剂应用
摘要采用水热法合成了具有正交或三角结构的Mo-V-W-O晶体配合氧化物。采用电感耦合等离子体原子发射光谱、TEM、STEM-EDX、x射线衍射、Rietveld分析和N2吸附法对不同钨含量的Mo-V-W-O样品进行了表征。在第一种情况下,使用(CH3CH2NH3)2Mo3O10可以成功地将W等附加金属加入到三角Mo-V-O结构中。烷基铵阳离子作为一种结构稳定剂,当存在额外的金属离子时,它是形成三角结构所必需的。对于正交晶型Mo-V-W-O结构,W的引入引起了棒偏析效应,形成了纳米级晶体,大大增加了外表面积。此外,还将这些Mo-V-W-O材料用作丙烯醛气相选择性氧化制丙烯酸的催化剂。正交型Mo-V-O-W7.5催化剂具有七方和六方通道排列有序、外表面积大的特点。
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Catalysis Structure & Reactivity
Catalysis Structure & Reactivity CHEMISTRY, PHYSICAL-
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