Highly Hydrophilic Ti−Beta Zeolite with Ti−Rich Exterior as Efficient Catalyst for Cyclohexene Epoxidation

Huang Pan; Rusi Peng; Zhiguo Zhu; Hao Xu; Mingyuan He; Peng Wu

doi:10.3390/catal12040434

Highly Hydrophilic Ti−Beta Zeolite with Ti−Rich Exterior as Efficient Catalyst for Cyclohexene Epoxidation

Huang Pan, Rusi Peng, Zhiguo Zhu, Hao Xu, Mingyuan He, Peng Wu

School of Chemistry and Molecular Engineering

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

Nanocrystalline Ti−Beta zeolite with high hydrophilicity and a Ti−rich exterior was successfully prepared via a dissolution–recrystallization method. With the post−treatment of tetraethylammonium hydroxide (TEAOH) solution at elevated temperature, the Si and Ti species within the Ti−Beta matrix were partially dissolved and recrystallized on the outer surface of crystals, resulting in the Ti−rich exterior and higher hydrophilicity, which improved the accessibility of the active Ti sites and the enrichment of H₂O₂. Simultaneously, some of the closed Ti(OSi)₄ species were transformed to more active open Ti(OSi)₃OH or Ti(OSi)₂ (H₂O)₂ (OH)₂ species. The modified Ti−Beta zeolite exhibited greatly enhanced catalytic performance in the epoxidation of cyclohexene in comparison to the parent Ti−Beta.

Original language	English
Article number	434
Journal	Catalysts
Volume	12
Issue number	4
DOIs	https://doi.org/10.3390/catal12040434
State	Published - Apr 2022

Keywords

Ti−Beta
Ti−rich exterior
cyclohexene epoxidation
hydrophilicity

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10.3390/catal12040434

Cite this

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title = "Highly Hydrophilic Ti−Beta Zeolite with Ti−Rich Exterior as Efficient Catalyst for Cyclohexene Epoxidation",

abstract = "Nanocrystalline Ti−Beta zeolite with high hydrophilicity and a Ti−rich exterior was successfully prepared via a dissolution–recrystallization method. With the post−treatment of tetraethylammonium hydroxide (TEAOH) solution at elevated temperature, the Si and Ti species within the Ti−Beta matrix were partially dissolved and recrystallized on the outer surface of crystals, resulting in the Ti−rich exterior and higher hydrophilicity, which improved the accessibility of the active Ti sites and the enrichment of H2O2. Simultaneously, some of the closed Ti(OSi)4 species were transformed to more active open Ti(OSi)3OH or Ti(OSi)2 (H2O)2 (OH)2 species. The modified Ti−Beta zeolite exhibited greatly enhanced catalytic performance in the epoxidation of cyclohexene in comparison to the parent Ti−Beta.",

keywords = "Ti−Beta, Ti−rich exterior, cyclohexene epoxidation, hydrophilicity",

author = "Huang Pan and Rusi Peng and Zhiguo Zhu and Hao Xu and Mingyuan He and Peng Wu",

note = "Publisher Copyright: {\textcopyright} 2022 by the authors. Licensee MDPI, Basel, Switzerland.",

year = "2022",

month = apr,

doi = "10.3390/catal12040434",

language = "英语",

volume = "12",

journal = "Catalysts",

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TY - JOUR

T1 - Highly Hydrophilic Ti−Beta Zeolite with Ti−Rich Exterior as Efficient Catalyst for Cyclohexene Epoxidation

AU - Pan, Huang

AU - Peng, Rusi

AU - Zhu, Zhiguo

AU - Xu, Hao

AU - He, Mingyuan

AU - Wu, Peng

PY - 2022/4

Y1 - 2022/4

N2 - Nanocrystalline Ti−Beta zeolite with high hydrophilicity and a Ti−rich exterior was successfully prepared via a dissolution–recrystallization method. With the post−treatment of tetraethylammonium hydroxide (TEAOH) solution at elevated temperature, the Si and Ti species within the Ti−Beta matrix were partially dissolved and recrystallized on the outer surface of crystals, resulting in the Ti−rich exterior and higher hydrophilicity, which improved the accessibility of the active Ti sites and the enrichment of H2O2. Simultaneously, some of the closed Ti(OSi)4 species were transformed to more active open Ti(OSi)3OH or Ti(OSi)2 (H2O)2 (OH)2 species. The modified Ti−Beta zeolite exhibited greatly enhanced catalytic performance in the epoxidation of cyclohexene in comparison to the parent Ti−Beta.

AB - Nanocrystalline Ti−Beta zeolite with high hydrophilicity and a Ti−rich exterior was successfully prepared via a dissolution–recrystallization method. With the post−treatment of tetraethylammonium hydroxide (TEAOH) solution at elevated temperature, the Si and Ti species within the Ti−Beta matrix were partially dissolved and recrystallized on the outer surface of crystals, resulting in the Ti−rich exterior and higher hydrophilicity, which improved the accessibility of the active Ti sites and the enrichment of H2O2. Simultaneously, some of the closed Ti(OSi)4 species were transformed to more active open Ti(OSi)3OH or Ti(OSi)2 (H2O)2 (OH)2 species. The modified Ti−Beta zeolite exhibited greatly enhanced catalytic performance in the epoxidation of cyclohexene in comparison to the parent Ti−Beta.

KW - Ti−Beta

KW - Ti−rich exterior

KW - cyclohexene epoxidation

KW - hydrophilicity

UR - https://www.scopus.com/pages/publications/85128429584

U2 - 10.3390/catal12040434

DO - 10.3390/catal12040434

M3 - 文章

AN - SCOPUS:85128429584

SN - 2073-4344

VL - 12

JO - Catalysts

JF - Catalysts

IS - 4

M1 - 434

ER -

Highly Hydrophilic Ti−Beta Zeolite with Ti−Rich Exterior as Efficient Catalyst for Cyclohexene Epoxidation

Abstract

Keywords

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