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Journal article
Enhancing catalytic epoxide ring-opening selectivity using surface-modified Ti3C2Tx MXenes
2d materials, Vol.8(3)
01 Jul 2021
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
MXenes are a new family of two-dimensional carbides and/or nitrides. Their 2D surfaces are typically terminated by O, OH and/or F atoms. Here we show that Ti3C2Tx-the most studied compound of the MXene family-is a good acid catalyst, thanks to the surface acid functionalities. We demonstrate this by applying Ti3C2Tx in the epoxide ring-opening reaction of styrene oxide (SO) and its isomerization in the liquid phase. Modifying the MXene surface changes the catalytic activity and selectivity. By oxidizing the surface, we succeeded in controlling the type and number of acid sites and thereby improving the yield of the mono-alkylated product to >80%. Characterisation studies show that a thin oxide layer, which forms directly on the Ti3C2Tx surface, is essential for catalysing the SO ring-opening. We hypothesize that two kinds of acid sites are responsible for this catalysis: In the MXene, strong acid sites (both Lewis and Bronsted) catalyse both the ring-opening and the isomerization reactions, while in the Mxene-TiO2 composite weaker acid sites catalyse only the ring-opening reaction, increasing the selectivity to the mono-alkylated product.
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Details
- Title
- Enhancing catalytic epoxide ring-opening selectivity using surface-modified Ti3C2Tx MXenes
- Creators
- Thierry K. Slot - Univ Amsterdam, Vant Hoff Inst Mol Sci, Sci Pk 904, NL-1098 XH Amsterdam, NetherlandsVarun Natu - Drexel Univ, Mat Sci & Engn, 3141 Chestnut St, Philadelphia, PA 19104 USAEnrique Ramos-Fernandez - Univ Alicante, Inst Univ Mat Alicante, Dept Quim Inorgan, Lab Mat Avanzados, Alicante, SpainAntonio Sepulveda-Escribano - Univ Alicante, Inst Univ Mat Alicante, Dept Quim Inorgan, Lab Mat Avanzados, Alicante, SpainMichel Barsoum - Drexel UniversityGadi Rothenberg - Univ Amsterdam, Vant Hoff Inst Mol Sci, Sci Pk 904, NL-1098 XH Amsterdam, NetherlandsN. Raveendran Shiju - Univ Amsterdam, Vant Hoff Inst Mol Sci, Sci Pk 904, NL-1098 XH Amsterdam, Netherlands
- Publication Details
- 2d materials, Vol.8(3)
- Publisher
- IOP Publishing Ltd
- Number of pages
- 9
- Grant note
- DMR 1740795 / NSF; National Science Foundation (NSF) 718.015.004 / NWO TOP-PUNT Catalysis in Confined Spaces MAT2017-86992-R; MAT2016-80285-P / MINECO (Spain); Spanish Government
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Identifiers
- 991019168000404721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Materials Science, Multidisciplinary