Accelerated crystallization of zeolites via hydroxyl free radicals

Feng, Guodong; Cheng, Peng; Yan, Wenfu; Boronat, Mercedes; Xu, Lina; Su, Ji‐Hu; Wang, Yunlong; Li, Yang; Corma, Avelino; Xu, Ruren; Yu, Jihong

doi:10.1126/science.aaf1559

Cited by 346 publications

(200 citation statements)

References 19 publications

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“…In general, the surface area values of ZSM‐5 zeolites obtained via many techniques are in the range 400 to 800 m 2 g ‐1 . In this work, the surface area values of the samples have variations from 260 to 399 m 2 g ‐1 , which is in agreement with some reported works . Strictly speaking, the BET area derived from nitrogen adsorption at 77 K for micropores containing material is controversial.…”

Section: Resultssupporting

confidence: 58%

Gemini‐type cationic surfactant‐directed synthesis of hollow ZSM‐5 zeolite with intracrystalline mesopores and its application in the hydroxylation of phenol

Shen

Wang

Han

et al. 2017

J of Chemical Tech & Biotech

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BACKGROUND ZSM‐5 zeolites are of great importance in industrial catalysis. However, the diffusion limitations caused by small pore opening restrict the extent of catalytic conversions over conventional ZSM‐5. Many studies have shown that mass transfer in zeolite channels can be improved by controlling the morphology or creating additional mesoporosity. Here, the catalytic performance is further improved by the creation of hollow structure and intracrystalline mesopores in ZSM‐5 zeolite. RESULTS The characterization results demonstrated that hollow ZSM‐5 with intracrystalline mesopores can be synthesized by using a simple one‐step hydrothermal strategy with a commercial gemini‐type cationic surfactant containing hydrophilic hydroxyl groups. Compared with the Fe‐substituted conventional ZSM‐5, the Fe‐substituted hollow ZSM‐5 with intracrystalline mesopores show remarkably enhanced catalytic performance in the hydroxylation of phenol. About 52.2% conversion of phenol can be obtained with almost 96.8% selectivity to dihydroxybenzenes. The catalytic activity remained almost unchanged after five cycles. CONCLUSION The newly created hollow structure and intracrystalline mesopores in ZSM‐5 zeolite showed enhanced catalytic activity and reusability for the hydroxylation of phenol, which is higher than most reported systems. The prepared catalyst is a promising alternative material for the hydroxylation of phenol. © 2017 Society of Chemical Industry

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Section: Resultssupporting

confidence: 58%

Gemini‐type cationic surfactant‐directed synthesis of hollow ZSM‐5 zeolite with intracrystalline mesopores and its application in the hydroxylation of phenol

Shen

Wang

Han

et al. 2017

J of Chemical Tech & Biotech

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“…Therefore, the formation of β-Bi 2 O 3 crystals is easy in these films at a low temperature (250 °C) (Figure S3c). The further UV irradiation accelerates crystallization23101245 in a matrix that is dense enough to allow the effective coalescence of the formed crystallites (Table S1). These crystallites will work like seeds for the full crystallization of the tetragonal β-Bi 2 O 3 phase as the irradiation time at 250 °C or the annealing temperature is increased (Figs 1b and S3d), under favorable not-constrained boundary conditions.…”

Section: Resultsmentioning

confidence: 99%

Photochemical solution processing of films of metastable phases for flexible devices: the β-Bi2O3 polymorph

Pérez-Mezcua

Bretos

Jiménez

et al. 2016

Sci Rep

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The potential of UV-light for the photochemical synthesis and stabilization of non-equilibrium crystalline phases in thin films is demonstrated for the β-Bi2O3 polymorph. The pure β-Bi2O3 phase is thermodynamically stable at high temperature (450–667 °C), which limits its applications in devices. Here, a tailored UV-absorbing bismuth(III)-N-methyldiethanolamine complex is selected as an ideal precursor for this phase, in order to induce under UV-light the formation of a –Bi–O–Bi– continuous network in the deposited layers and the further conversion into the β-Bi2O3 polymorph at a temperature as low as 250 °C. The stabilization of the β-Bi2O3 films is confirmed by their conductivity behavior and a thorough characterization of their crystal structure. This is also supported by their remarkable photocatalytic activity. Besides, this processing method has allowed us for the first time the preparation of β-Bi2O3 films on flexible plastic substrates, which opens new opportunities for using these materials in potential applications not available until now (e.g., flexible photocatalytic reactors, self-cleaning surfaces or wearable antimicrobial fabrics). Therefore, photochemical solution deposition (PCSD) demonstrates to be not only an efficient approach for the low temperature processing of oxide films, but also an excellent alternative for the stabilization of metastable phases.

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confidence: 99%

“…Because of its high oxidizing potential, the hydroxyl radical nonselectively reacts with numerous organic substances at near diffusion-controlled rates, [1] thus playing au nique role in biochemical processes, [2] inorganic and organic synthesis, [3] DNA structurei dentification, [4] and wastewater treatment. Because of its high oxidizing potential, the hydroxyl radical nonselectively reacts with numerous organic substances at near diffusion-controlled rates, [1] thus playing au nique role in biochemical processes, [2] inorganic and organic synthesis, [3] DNA structurei dentification, [4] and wastewater treatment.…”

mentioning

confidence: 99%

Facile Photoinduced Generation of Hydroxyl Radical on a Nitrocellulose Membrane Surface and its Application in the Degradation of Organic Pollutants

et al. 2018

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A simple, clean, and efficient method has been developed for generating hydroxyl radicals on a nitrocellulose membrane (NCM) under light of wavelengths greater than 280 nm. Hydroxyl radicals formed on the NCM surface, diffusing into the bulk solution under irradiation. Radical generation was shown to be dependent on the nature of the NCM and light, and independent of the properties of the bulk solution. The quantum yield for hydroxyl radicals from the NCM was 1.72×10 , which is approximately 2.46 times that from TiO . This hydroxyl radical generation method was preliminarily applied in the photodegradation of organic pollutants, in which electrostatic interactions between the pollutant molecules and the NCM surface were found to play a key role. Further applications of this hydroxyl radical generation method should be assessed.

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Accelerated crystallization of zeolites via hydroxyl free radicals

Cited by 346 publications

References 19 publications

Gemini‐type cationic surfactant‐directed synthesis of hollow ZSM‐5 zeolite with intracrystalline mesopores and its application in the hydroxylation of phenol

Gemini‐type cationic surfactant‐directed synthesis of hollow ZSM‐5 zeolite with intracrystalline mesopores and its application in the hydroxylation of phenol

Photochemical solution processing of films of metastable phases for flexible devices: the β-Bi2O3 polymorph

Facile Photoinduced Generation of Hydroxyl Radical on a Nitrocellulose Membrane Surface and its Application in the Degradation of Organic Pollutants

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