ID | 111220 |
Title Alternative | XAFS Characterization of Active Fe Species in Fe2O3-SiO2 Catalyst for Styrene Dimerization
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Author |
Yamamoto, Takashi
The University of Tokushima
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Okada, Saki
The University of Tokushima
Yamashita, Kazuhide
The University of Tokushima
Sada, Chisa
The University of Tokushima
Imai, Shoji
The University of Tokushima
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Miyoshi, Norikazu
The University of Tokushima
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Wada, Makoto
The University of Tokushima
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Keywords | 鉄イオン
シリカ
固体酸触媒
XAFS
α-メチルスチレン二量化
Iron ion
Silica
Solid acid catalyst
α-methylstylene dimerization
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Content Type |
Journal Article
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Description | α-メチルスチレン二量化反応に活性を示す鉄ゾル-ゲル法にて調製した鉄シリカ触媒をX線回折およびX線吸収分光法により評価した.触媒中鉄種の存在状態は仕込みSi /Fe 比に依存し,100 以上では四面体FeOxCl4-x種,50以下ではα-Fe2O3 凝集種が主成分であり,その存在比をXANES解析により求めた.シリカマトリクスに捕捉された孤立FeOxCl4-x が活性種として機能し,固体酸性質を発現する機構について論じた.
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Description Alternative | Iron ion-promoted silica solid acid catalysts active for α-methylstyrene dimerization were characterized by XRD and Fe K-edge XANES/EXAFS spectroscopic techniques. The possible active species were proposed. The 1 mol % of iron to Si was incorporated in catalyst samples, which was prepared by sol-gel process using iron chloride and tetraethylorthsilicate (TEOS) as the sources. The incorporated trivalent iron species were characterized as tetrahedral FeOxCl4-x , and excess loaded species were aggregated to form α-Fe2O3 during drying process at 403 K. The fraction of [FeOxCl4-x], [FeCl6] and [FeO6] species in the catalyst samples were determined by the least-squares analysis of XANES.
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Journal Title |
Advances in X-Ray Chemical Analysis, Japan
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ISSN | 09117806
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NCID | AN0000592X
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Publisher | 日本分析化学会
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Volume | 42
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Start Page | 237
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End Page | 248
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Published Date | 2011-03-31
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Rights | ©社団法人日本分析化学会X線分析研究懇談会
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EDB ID | |
FullText File | |
language |
jpn
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TextVersion |
Publisher
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departments |
Science and Technology
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