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Influence of the Brönsted and Lewis acid sites on the catalytic activity and selectivity of Fe/MCM-41 system

Paper ID Volume ID Publish Year Pages File Format Full-Text
40833 45867 2012 10 PDF Available
Title
Influence of the Brönsted and Lewis acid sites on the catalytic activity and selectivity of Fe/MCM-41 system
Abstract

The system Fe2O3/MCM-41, with high iron dispersion, was synthesized in order to introduce Lewis acid sites into the MCM-41 structure. Two calcination atmospheres (inert and oxidant) were used to produce iron nanoclusters with different structural properties. Besides, a silylation treatment was realized on both solids with the aim of neutralizing the Brönsted acidity associated with the MCM-41 silanol groups. The samples were characterized by atomic absorption spectroscopy, X-ray diffraction at low angles, N2 adsorption, temperature-programmed reduction, Fourier transform infrared spectroscopy, nuclear magnetic resonance of 29Si, and Mössbauer spectroscopy. The influence of the structural changes of the nanoclusters and the effect of the simultaneous presence of Lewis and Brönsted acid sites were evaluated studying the product distribution from the α-pinene oxide isomerization reaction. It was determined that the Brönsted acidity of the Fe/MCM-41 system has not the sufficient acid strength to modify the product distribution which is mainly governed by the Lewis sites.

Graphical abstract.Figure optionsDownload full-size imageDownload high-quality image (137 K)Download as PowerPoint slideHighlights► Lewis acid sites were produced using iron oxide in Fe/MCM-41 system. ► Brönsted acid sites were neutralized by silylation treatment. ► Brönsted acidity is not enough to modify the selectivity in POX isomerization. ► Different calcination atmospheres lead to different types of acid Lewis sites of Fe3+.

Keywords
POX isomerization; Lewis acid sites; MCM-41; Mössbauer spectroscopy
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Influence of the Brönsted and Lewis acid sites on the catalytic activity and selectivity of Fe/MCM-41 system
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 435–436, 5 September 2012, Pages 187–196
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
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