Redox Treatment of Orthorhombic Mo29V11O112 and Relationships between Crystal Structure, Microporosity and Catalytic Performance for Selective Oxidation of Ethane
Redox Treatment of Orthorhombic Mo29V11O112 and Relationships between Crystal Structure, Microporosity and Catalytic Performance for Selective Oxidation of Ethane
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正交晶系Mo29V11O112的氧化还原处理及其晶体结构、微孔率与乙烷选择性氧化催化性能的关系
DOI：
10.1021/jp512848w
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Wataru Ueda
中科院分区：
文献类型：
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作者：
Satoshi Ishikawa;Daichi Kobayashi;Takeshi Konya;Shunpei Ohmura;Toru Murayama;Nobuhiro Yasuda;Masahiro Sadakane;Wataru Ueda
对正交mo29v11o112催化剂（MoVO）进行了氧化还原处理，并对其晶体结构、微孔隙率和催化活性进行了研究。TPR和TG表明，通过还原处理，MoVO从结构中演化出两种晶格氧（α-氧和β-氧）。在还原初期，α-氧从结构中析出，导致微孔通道扩张。随着进一步还原，五边形[Mo6O21]6单元中的原子向微孔通道移动，导致微孔尺寸减小。微孔的扩张极大地提高了乙烷选择性氧化的催化活性，但活性随着微孔通道尺寸的减小而降低。发现晶体结构、微孔隙度和乙烷选择性氧化催化活性之间存在密切关系。
Redox treatments of an orthorhombic Mo29V11O112catalyst (MoVO) were conducted and its crystal structure, microporosity, and catalytic activity were investigated. TPR and TG revealed that MoVO evolved two kinds of lattice oxygen (α-oxygen and β-oxygen) from the structure by reduction treatment. In the early stage of reduction, α-oxygen was evolved from the structure, causing expansion of the micropore channel. With further reduction, the atoms in the pentagonal [Mo6O21]6–unit moved toward the micropore channel, resulting in a decrease in micropore size. Expansion of the micropore drastically increased catalytic activity for selective oxidation of ethane, but the activity was decreased by a reduction in the micropore channel size. Strong relationships were found between crystal structure, microporosity, and catalytic activity for selective oxidation of ethane.