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ID 20598
本文ファイル
著者
Li, Dalin
Shiraga, Masato
Atake, Ikuo
Shishido, Tetsuya
Oumi, Yasunori
キーワード
propane partial oxidation
H2 production
Ru-Ni/Mg(Al)O catalyst
hydrotalcite
self activation
reduction-oxidation treatment
NDC
化学工業
抄録(英)
Ru (0.1~0.5 wt%) loaded Ni/Mg(Al)O catalysts have been prepared by adopting the "memory effect," i.e., the reconstitution of Mg(Ni)-Al hydrotalcite from the Mg(Ni,Al)O periclase after the heat-treatment, and their catalytic activities have been tested in the partial oxidation of propane. The Ru-Ni0.5/Mg2.5(Al)O catalysts were prepared by dipping Mg2.5(Al,Ni0.5)O periclase derived from Mg2.5(Ni0.5)-Al hydrotalcite in an aqueous solution of Ru(III) nitrate. The reconstitution of hydrotaclite took place by the "memory effect" and was simultaneously accompanied by Ru incorporation in the hydrotalcite layer, leading to the formation of the active Ni-Ru bimetal loaded catalyst after the calcination followed by the reduction. Upon O2 purging at 700 °C during the propane partial oxidation at 600 °C, the Ru-Ni0.5/Mg2.5(Al)O catalyst showed no deactivation, while the Ni0.5/Mg2.5(Al)O catalyst was totally deactivated by the Ni oxidation. Moreover, the Ru-Ni0.5/Mg2.5(Al)O catalysts were self-activated under the reaction conditions without reduction pre-treatment with H2. The activity of the Ru-Ni0.5/Mg2.5(Al)O catalysts was enhanced with increasing the Ru loading after the reduction-oxidation pretreatment. After the treatment, two types of Ni reduction peak were observed in the TPR of the catalysts: the 1st peak observed around 550 °C was weakened, whereas the 2nd peak observed around 750 °C was enhanced, with increasing the Ru loading. The 1st is assigned to non-active Ni2+ ions having square-pyramidal coordination in the outermost layer of the Mg(Al)O structure, while the 2nd is probably of active Ni-Ru bimetallic species composed of finely dispersed Ni metal particles combined with Ru.
掲載誌名
Applied Catalysis A: General
321巻
2号
開始ページ
155
終了ページ
164
出版年月日
2007-04-11
出版者
Elsevier Science B.V.
ISSN
0926-860X
NCID
出版者DOI
言語
英語
NII資源タイプ
学術雑誌論文
広大資料タイプ
学術雑誌論文
DCMIタイプ
text
フォーマット
application/pdf
著者版フラグ
author
権利情報
Copyright (c) 2007 Elsevier B.V.
関連情報URL
部局名
工学研究科