Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 233, Issue -, Pages 16-25Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2016.06.031
Keywords
Hierarchical zeolites; Titanosilicalite; Desilication; Cyclohexene epoxidation; Phenol hydroxylation
Categories
Funding
- National Science Centre, Poland [2015/18/E/ST4/00191]
- operational Program Research and Development through European Regional Development Fund
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The presented data showed that the chemical treatment of TS-1 with alkaline medium resulted in the formation of highly developed hierarchical structures. The esterification of the hydroxyl groups by methanol allowed modifying the hydrophobicity of TS-1 surface and obtaining truly micro/mesoporous material. The preservation of microporous characteristics was confirmed by XRD and low temperature nitrogen sorption studies. Detailed information on acidic properties of mesoporous titanosilicalites was delivered by IR studies of pyridine sorption and implicitly from Si-29 MAS NMR investigations. Well developed internal mesoporosity together with the retaining of Ti4+ atoms in tetrahedral framework positions offered 7-fold higher catalytic activity for the conversion of cyclohexene molecules than the native microporous TS-1. The selectivity to epoxide reached the value of 96% for the most efficient mesoporous titanosilicate. (C) 2016 Elsevier Inc. All rights reserved.
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