Oxidation Activity of Ti-Beta Synthesized by a Dry-Gel Conversion Method

Ti-beta zeolite was synthesized in the presence of sodium cations by a dry-gel conversion method using tetraethylammonium hydroxide as a structure-directing agent. As evidenced by diffuse reflectance UV spectroscopy, incorporated titianium species were tetrahedrally coordinated in the zeolites and n...

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Bibliographic Details
Published inJournal of catalysis Vol. 180; no. 2; pp. 132 - 141
Main Authors Jappar, Nizamidin, Xia, Qinghua, Tatsumi, Takashi
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier Inc 10.12.1998
Elsevier
Subjects
Catalysis
Catalysts: preparations and properties
Chemistry
Exact sciences and technology
General and physical chemistry
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Characterization
Alcohol
Oxidation
Zeolite
Experimental study
Ultraviolet spectrometry
Chemical synthesis
Conversion
Catalyst
Molecular sieve
Titanium ion
Modified material
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Summary:Ti-beta zeolite was synthesized in the presence of sodium cations by a dry-gel conversion method using tetraethylammonium hydroxide as a structure-directing agent. As evidenced by diffuse reflectance UV spectroscopy, incorporated titianium species were tetrahedrally coordinated in the zeolites and neither anatase-like phase nor hexacoordinated titianium species belonging to an amorphous titanosilicate phase was detected at the sodium content of lower than 1.0 mol%. It was found that the Ti-beta catalysts gave very high H2O2conversion and selectivity in the oxidation of cyclohexene in methanol used as solvent. The C6-C8cyclic alkenes and alkanes reacted faster than corresponding linear alkenes and alkanes, showing the lack of steric impediments in the pores of Ti-beta. Dimethylcyclohexanes were more reactive when tertiary H atoms predominantly occupy the equatorial position than when they occupy the axial position. Ti-beta samples exhibited high activity also for the oxidation of C6-C8cyclic alcohols.
ISSN:0021-9517
1090-2694
DOI:10.1006/jcat.1998.2266