Gas phase contributions to topochemical hydride reduction reactions

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• 作者：Yoji Kobayashi ; Zhaofei Li ; Kei Hirai ; C茅dric Tassel ; Fran莽ois Loyer ; Noriya Ichikawa ; Naoyuki Abe ; Takafumi Yamamoto ; Yuichi Shimakawa ; Kazuyoshi Yoshimura ; Mikio Takano ; Olivier J. Hern ; ez ; Hiroshi Kageyama
• 关键词：CaH2 ; Topochemical reaction ; H2 reduction
• 刊名：Journal of Solid State Chemistry
• 出版年：November, 2013
• 年：2013
• 卷：207
• 期：Complete
• 页码：190-193
• 全文大小：853 K

文摘

Alkali and alkali earth hydrides have been used as solid state reductants recently to yield many interesting new oxygen-deficient transition metal oxides. These reactions have tacitly been assumed to be a solid phase reaction between the reductant and parent oxide. We have conducted a number of experiments with physical separation between the reductant and oxides, and find that in some cases reduction proceeds even when the reagents are physically separated, implying reactions with in-situ generated H₂ and, to a lesser extent, getter mechanisms. Our findings change our understanding of these topochemical reactions, and should enhance the synthesis of additional new oxides and nanostructures.