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Title: Highly effective methylated Ti MCM-41 catalyst for cyclohexene oxidation

Abstract

Highlights: • Methylated TiMCM-41 materials are synthesized by direct room temperature stirring in 3 h of time using NH{sub 3} as a base instead of alkali metal hydroxide. • The synthesized materials are tested for the oxidation reaction of cyclohexene in the presence of H{sub 2}O{sub 2} as an oxidant. • Methylation improved the hydrophobicity of the catalytic active sites of TiMCM-41 materials. - Abstract: A series of Ti containing MCM-41 materials were synthesized with different Si/Ti molar ratios and tested for cyclohexene epoxidation reaction. TiMCM-41 with Si/Ti ratio 40 which gave maximum conversion and selectivity to epoxide was methylated with methyltriethoxysilane (MTES) in this reaction. Accordingly, four different methyl loading (5, 10, 15 and 20 mol % of MTES w.r.t. TEOS) TiMCM-41(Si/Ti 40) samples were prepared. The materials were characterized by different physical techniques such as PXRD, FT-IR spectroscopy, UV–vis DRS spectroscopy, N{sub 2} adsorption-desorption isotherm, SEM-EDX, TEM, TGA and ICP-OES. The catalysts were then tested for cyclohexene epoxidation reaction in the presence of H{sub 2}O{sub 2} avoiding TBHP. The conversion and selectivity for cyclohexene obtained with 10MeTiM-1 (Si/Ti 40) were found to be the best not only among the catalysts investigated in the present work, but also amongmore » all the catalysts studied so far for the reaction.« less

Authors:
Publication Date:
OSTI Identifier:
22804048
Resource Type:
Journal Article
Journal Name:
Materials Research Bulletin
Additional Journal Information:
Journal Volume: 103; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0025-5408
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ADSORPTION; ALKALI METALS; AMMONIA; CATALYSTS; CYCLOHEXANE; DESORPTION; EMISSION SPECTROSCOPY; EPOXIDES; FOURIER TRANSFORM SPECTROMETERS; HYDROGEN PEROXIDE; HYDROXIDES; INFRARED SPECTRA; ISOTHERMS; METHYLATION; OXIDATION; SCANNING ELECTRON MICROSCOPY; STIRRING; TEMPERATURE RANGE 0273-0400 K; THERMAL GRAVIMETRIC ANALYSIS; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION

Citation Formats

Roy, Sushanta Kumar, E-mail: roy16sushanta@gmail.com, Dutta, Debajani, and Talukdar, Anup K., E-mail: aktalukdar@gauhati.ac.in. Highly effective methylated Ti MCM-41 catalyst for cyclohexene oxidation. United States: N. p., 2018. Web. doi:10.1016/J.MATERRESBULL.2018.03.017.
Roy, Sushanta Kumar, E-mail: roy16sushanta@gmail.com, Dutta, Debajani, & Talukdar, Anup K., E-mail: aktalukdar@gauhati.ac.in. Highly effective methylated Ti MCM-41 catalyst for cyclohexene oxidation. United States. https://doi.org/10.1016/J.MATERRESBULL.2018.03.017
Roy, Sushanta Kumar, E-mail: roy16sushanta@gmail.com, Dutta, Debajani, and Talukdar, Anup K., E-mail: aktalukdar@gauhati.ac.in. 2018. "Highly effective methylated Ti MCM-41 catalyst for cyclohexene oxidation". United States. https://doi.org/10.1016/J.MATERRESBULL.2018.03.017.
@article{osti_22804048,
title = {Highly effective methylated Ti MCM-41 catalyst for cyclohexene oxidation},
author = {Roy, Sushanta Kumar, E-mail: roy16sushanta@gmail.com and Dutta, Debajani and Talukdar, Anup K., E-mail: aktalukdar@gauhati.ac.in},
abstractNote = {Highlights: • Methylated TiMCM-41 materials are synthesized by direct room temperature stirring in 3 h of time using NH{sub 3} as a base instead of alkali metal hydroxide. • The synthesized materials are tested for the oxidation reaction of cyclohexene in the presence of H{sub 2}O{sub 2} as an oxidant. • Methylation improved the hydrophobicity of the catalytic active sites of TiMCM-41 materials. - Abstract: A series of Ti containing MCM-41 materials were synthesized with different Si/Ti molar ratios and tested for cyclohexene epoxidation reaction. TiMCM-41 with Si/Ti ratio 40 which gave maximum conversion and selectivity to epoxide was methylated with methyltriethoxysilane (MTES) in this reaction. Accordingly, four different methyl loading (5, 10, 15 and 20 mol % of MTES w.r.t. TEOS) TiMCM-41(Si/Ti 40) samples were prepared. The materials were characterized by different physical techniques such as PXRD, FT-IR spectroscopy, UV–vis DRS spectroscopy, N{sub 2} adsorption-desorption isotherm, SEM-EDX, TEM, TGA and ICP-OES. The catalysts were then tested for cyclohexene epoxidation reaction in the presence of H{sub 2}O{sub 2} avoiding TBHP. The conversion and selectivity for cyclohexene obtained with 10MeTiM-1 (Si/Ti 40) were found to be the best not only among the catalysts investigated in the present work, but also among all the catalysts studied so far for the reaction.},
doi = {10.1016/J.MATERRESBULL.2018.03.017},
url = {https://www.osti.gov/biblio/22804048}, journal = {Materials Research Bulletin},
issn = {0025-5408},
number = ,
volume = 103,
place = {United States},
year = {2018},
month = {7}
}