Preparation of hydrophobic Ti-beta catalyst derived from Al-rich zeolite beta synthesized without using organic structure-directing agent and its enhanced catalytic performance for phenol oxidation

Inagaki, Shigenori; Takeyama, Mei; Asanuma, Kai; Yokose, Yu; Zhang, Shengxiang; Okuda, Tae; Nakamura, Kaisei; Nishi, Yuko; Kubota, Yoshihiro

doi:10.1016/j.micromeso.2022.112323

Cited by 3 publications

(3 citation statements)

References 38 publications

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“…Surface hydrophobicity is an important factor that affects the performance of heterogeneous catalysts for various reactions. In particular, low-temperature gas-phase reactions, in which water is used as a reactant or product, [1,2] and liquid-phase reactions, in which water serves as a (co)solvent [3,4], are strongly influenced by the surface hydrophobicity of the catalyst. Therefore, various techniques, such as surface coating, surface grafting, surface etching, and space structure modification, have been adopted to control the surface hydrophobicity of catalysts [5].…”

Section: Introductionmentioning

confidence: 99%

Simple Fabrication of Hydrophobicity-Controlled Fe-ZSM-5 for Aqueous-Phase Partial Oxidation of Methane with Hydrogen Peroxide

Hwang,

Kwon,

Hwang

et al. 2024

Catalysts

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Surface hydrophobicity is an important factor in controlling the catalytic activity of heterogeneous catalysts in various reactions, particularly liquid-phase reactions using water as the (co)solvent. In this study, the surface hydrophobicity of Fe-ZSM-5 was successfully controlled using a simple coating method in which furfuryl alcohol was used as the carbon precursor. Various techniques, such as N2 physisorption, temperature-programmed desorption of ammonia, and contact angle measurements of water droplets, were used to characterize the catalysts. Fe-ZSM-5 catalysts with different degrees of hydrophobicity were used for the aqueous-phase selective oxidation of methane with H2O2. The positive effect of the surface carbon coating on the catalytic performance was confirmed when the carbon content was not sufficiently high to block the pores.

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Section: Introductionmentioning

confidence: 99%

Simple Fabrication of Hydrophobicity-Controlled Fe-ZSM-5 for Aqueous-Phase Partial Oxidation of Methane with Hydrogen Peroxide

Hwang,

Kwon,

Hwang

et al. 2024

Catalysts

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“…Our typical reaction to evaluate the catalytic performances and to examine the causes of the activity and selectivity of this material is the oxidation of phenol using H 2 O 2 as an oxidant. This reaction is very sensitive to the balance of hydrophobicity and hydrophilicity. , In fact, the catalytic performance of [Ti]-MCM-68, a typical MSE -type titanosilicate, drastically enhanced when its hydrophobicity was increased by calcination just before catalytic use. , Thus, it is worth investigating the hydrophobicity of the MSE -type materials. We report herein the hydrophobic–hydrophilic nature of the MSE -type materials such as [Ti]-YNU-2 in addition to the crystallization behavior of YNU-2P and another options of stabilization techniques, which have not been published in detail.…”

Section: Introductionmentioning

confidence: 99%

“…This reaction is very sensitive to the balance of hydrophobicity and hydrophilicity. 18,28 In fact, the catalytic performance of [Ti]-MCM-68, a typical MSE-type titanosilicate, drastically enhanced when its hydrophobicity was increased by calcination just before catalytic use. 17,29 Thus, it is worth investigating the hydrophobicity of the MSE-type materials.…”

Section: Introductionmentioning

confidence: 99%

Crystallization Behavior of Highly Defective MSE-Type Zeolite, Incorporation of Ti into the Framework, and Its Hydrophobic–Hydrophilic Nature Controlled by Post-Synthesis Modifications

Inagaki

Kaneda

Haikal

et al. 2023

Crystal Growth & Design

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YNU-2 is a pure-silica version of MSE-type zeolite obtained by steam-assisted crystallization (SAC) technique, followed via suitable stabilization by postsynthesis modification. Taking advantage of the SAC method, the change of zeolitic phase during the crystallization was tracked. In the presence of organic structure-directing agent (OSDA), the Beta phase first appeared as an intermediate followed by the formation of OSDA-MSE composite, YNU-2P, as the final crystallization product. When the YNU-2P was directly calcined at temperatures higher than 400 °C to remove the occluded OSDA, the MSE framework collapsed due to the existence of a large number of site defects in the framework. The highly crystalline YNU-2 was only obtained when the YNU-2P was steamed or acid-treated under appropriate conditions. The framework stabilization was achieved by various techniques that cause Si-migration. The extent of Si-migration was dependent on the treatment conditions. For the Ti-incorporation to prepare [Ti]-YNU-2, enough but incomplete Si-migration by steaming is necessary rather than thorough acid-treatment to fill all the site defects. [Ti]-YNU-2 exhibits a catalytic performance superior to that of [Ti]-MCM-68, even though the former has a local hydrophilic field in the micropores that gives a type-V water adsorption isotherm, suggesting that the Si-migration occurs during the steaming and generates hydrophilic supermicropores.

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[Ti]-YNU-5: a large-pore titanosilicate as an efficient catalyst for selective oxidations

Zhang,

Asanuma,

Inagaki

et al. 2024

Chemistry Letters

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Preparation of hydrophobic Ti-beta catalyst derived from Al-rich zeolite beta synthesized without using organic structure-directing agent and its enhanced catalytic performance for phenol oxidation

Cited by 3 publications

References 38 publications

Simple Fabrication of Hydrophobicity-Controlled Fe-ZSM-5 for Aqueous-Phase Partial Oxidation of Methane with Hydrogen Peroxide

Simple Fabrication of Hydrophobicity-Controlled Fe-ZSM-5 for Aqueous-Phase Partial Oxidation of Methane with Hydrogen Peroxide

Crystallization Behavior of Highly Defective MSE-Type Zeolite, Incorporation of Ti into the Framework, and Its Hydrophobic–Hydrophilic Nature Controlled by Post-Synthesis Modifications

[Ti]-YNU-5: a large-pore titanosilicate as an efficient catalyst for selective oxidations

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