ID 111220
Title Alternative
XAFS Characterization of Active Fe Species in Fe2O3-SiO2 Catalyst for Styrene Dimerization
Author
Kikuchi, Makoto The University of Tokushima KAKEN Search Researchers
Okada, Saki The University of Tokushima
Yamashita, Kazuhide The University of Tokushima
Sada, Chisa The University of Tokushima
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
Content Type
Journal Article
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.
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.
Journal Title
Advances in X-Ray Chemical Analysis, Japan
ISSN
09117806
NCID
AN0000592X
Publisher
日本分析化学会
Volume
42
Start Page
237
End Page
248
Published Date
2011-03-31
Rights
©社団法人日本分析化学会X線分析研究懇談会
EDB ID
FullText File
language
jpn
TextVersion
Publisher
departments
Science and Technology