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Mesoporous titanosilicates synthesized from TS-1 precursors with enhanced catalytic activity in the α-pinene selective oxidation

Paper ID Volume ID Publish Year Pages File Format Full-Text
43262 45960 2008 10 PDF Available
Title
Mesoporous titanosilicates synthesized from TS-1 precursors with enhanced catalytic activity in the α-pinene selective oxidation
Abstract

Ti-containing mesoporous catalysts have been successfully prepared using zeolite precursors as building blocks of the mesoporous network. Tetrapropylammonium (TPA) cations were used as structure directing agent in the TS-1 precursor solutions. The assembly of the polymeric zeolite precursor species into a mesophase was carried out at room temperature assisted by cetyltrimethylammonium bromide as surfactant. Various techniques including XRD, diffuse reflectance UV–vis (DRUV–vis), N2 adsorption, SEM, transmission electron microscopy (TEM) and thermogravimetric analysis (TGA) were employed for the materials characterization. Ti was incorporated into the silica framework in isolated sites, anatase phase was not observed. These materials were catalytically tested in the oxidation of α-pinene with aqueous H2O2, showing an enhanced activity when compared to a conventional mesoporous titanosilicate. Both a catalyst obtained from a precursor gel containing Na and aged at 80 °C for 1 day and one obtained from a precursor gel without Na but aged for 2 days at 80 °C showed the highest activity and selectivity to products arising from epoxidation mechanism. This feature can be attributed to a chemical environment of the Ti species very close to that in titanosilicalite and clearly distinguishable from that in a conventional mesoporous catalyst. An addition of peroxide after the first reaction hour allowed us to increase the conversion values in ∼30%.

Graphical abstractTi-containing mesoporous catalysts have been prepared using zeolite precursors as building blocks of the mesoporous network. These materials were catalytically tested in the oxidation of α-pinene with aqueous H2O2, showing an enhanced activity when compared to a conventional mesoporous titanosilicate. This feature can be attributed to a chemical environment of the Ti species very close to that in titanosilicalite and clearly distinguishable from that in a conventional mesoporous catalyst.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Zeolite precursors; TS-1; Mesoporous materials; Titanosilicates; Epoxidation; α-Pinene
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Mesoporous titanosilicates synthesized from TS-1 precursors with enhanced catalytic activity in the α-pinene selective oxidation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 343, Issues 1–2, 1 July 2008, Pages 77–86
Authors
, , , , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us