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Iron oxide colloids and their heterogenization by silica sol–gel entrapment: Catalytic and magnetic properties

Paper ID Volume ID Publish Year Pages File Format Full-Text
42980 45950 2008 8 PDF Available
Title
Iron oxide colloids and their heterogenization by silica sol–gel entrapment: Catalytic and magnetic properties
Abstract

Fe3O4 colloids modified by the chiral ligand cinchonidine were prepared with the goal of obtaining a magnetic and catalytic nano-material and were subsequently embedded in silica to form a heterogeneous catalyst. The systems were characterized by TEM and XRD measurements, while the Mössbauer technique was applied for measuring the magnetic properties of the Fe3O4 colloids. The hyperfine magnetic field distribution was consistent with one type of Fe oxide, namely, the magnetite (Fe3O4). These colloids, both as ‘quasi-homogenous catalysts’ (or soluble heterogeneous catalysts) and embedded in silica (heterogeneous catalysts) were employed in the selective hydrogenolysis of complex bicyclo[2.2.2]oct-7-enes (bicyclo[2.2.2]oct-2-enes when unsubstituted).

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Keywords
Fe oxide; Cinchonidine; Silica-embedded colloids; TEM; XRD; Mössbauer; Hydrogenolysis of bicyclo[2.2.2]oct-7-enes
First Page Preview
Iron oxide colloids and their heterogenization by silica sol–gel entrapment: Catalytic and magnetic properties
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 346, Issues 1–2, 31 August 2008, Pages 28–35
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis