Fully utilizing seeds solution for solvent-free synthesized nanosized TS-1 zeolites with efficient epoxidation of chloropropene

Liu, Hanfang; Wang, Yu; Ye, Tiantian; Wang, Fupeng; Ran, Saisai; Xie, Huijie; Liu, Jia; Li, Yichuan; Li, Bin; Liu, Yanru; Chai, Yong‐Ming; Wang, Lei

doi:10.1016/j.jssc.2021.122844

Cited by 10 publications

(8 citation statements)

References 64 publications

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“…Meanwhile, two peaks of Ti were found at 460.6 and 458.8 eV in TS-1 (Figure C). The characteristic peak at about 460.6 eV corresponds to the Ti(IV) species, which were generally accepted as closed tetra-coordinated Ti(OSi) 4 and/or (SiO) 3 TiOH, and another peak at about 458.8 eV corresponds to the Ti(VI) species, which were accepted as open active hexa-coordinated (SiO) 3 TiOH(H 2 O) 2 and/or (SiO) 2 Ti(OH) 2 (H 2 O) 2 . ,− …”

Section: Resultsmentioning

confidence: 99%

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Removal of Gaseous H₂S by the Titanium Silicalite-1/H₂O₂ Wet Oxidation System

Wang

Chen

et al. 2023

Energy Fuels

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A wet oxidation system of titanium silicalite-1 (TS-1)/hydrogen peroxide (H2O2) was proposed for gaseous hydrogen sulfide (H2S) removal in this study, and the effects of the TS-1 dosage, H2O2 concentration, H2S concentration, reaction temperature, gas flow, and reaction time on the removal rate of H2S (η) were investigated. Samples were characterized by transmission electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, electron paramagnetic resonance, and N2 adsorption–desorption. An experiment using isopropanol, benzoquinone, and butylated hydroxytoluene was carried out as well to verify the active substance in the TS-1/H2O2 system. The results show that η reached 86.3% when bubbling 160 ppm of H2S through a 500 mL solution (pH 4.21) containing TS-1 (0.5 g/L) and H2O2 (0.33 mol/L, 1.12 wt %) at 293 K and atmospheric pressure with a flow rate of 265 mL/min. Subsequently, the mechanism of the reaction was proposed. After the H2S diffuses onto the surface of TS-1, it is first oxidized by adsorbed H2O2 and eventually oxidized to H2SO4; this process is controlled by H2S diffusion. The final product of the process is sulfuric acid, which is pollution-free and can be recycled to achieve resource utilization. The removal of H2S by the TS-1/H2O2 system is a green, simple, low-cost, resource-saving, safe, and efficient method.

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Section: Resultsmentioning

confidence: 99%

“…TS-1 needs to be calcined at 823 K when prepared. ,, Thus, used TS-1 (U-TS-1) was calcined in air at 823 K for 2 h to obtain the regeneration of TS-1 (named R-TS-1) for further desulfurization experiments and characterization. The results have been placed in the figures (see Figures and –) and tables (Tables and ).…”

Section: Resultsmentioning

confidence: 99%

Removal of Gaseous H₂S by the Titanium Silicalite-1/H₂O₂ Wet Oxidation System

Wang

Chen

et al. 2023

Energy Fuels

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“…Compared with conventional synthesis, solvent-free synthesis of zeolites has obvious advantages, such as high zeolite yields, high autoclave utilization, significantly reduced pollutants, reduced energy consumption, simple synthesis processes, and significantly reduced reaction pressures (Meng and Xiao, 2014). Subsequently, it was also successful to synthesize TS-1 zeolite using this method (Zhu et al, 2015;Cui et al, 2017;Fu et al, 2020;Wang et al, 2020;Liu et al, 2022). Zhu et al (2015) reported the synthesis of TS-1 zeolite using fumed silica, titanium sulfate, TPAOH and zeolite seeds as raw materials under solvent-free conditions.…”

Section: Solvent-free Synthesismentioning

confidence: 99%

“…Notably, TS-1 synthesized by this route has almost the same catalytic performance with that of TS-1 zeolite synthesized by conventional hydrothermal method in the catalytic oxidation of hexane. Liu et al (2022) reported the improved synthesis of TS-1 zeolite from solvent-free synthesis, obtaining the anatase-free nanosized TS-1 zeolite product. It just mixed the untreated seed solution prepared by TPAOH and TEOS, silicon source, and titanium source, then ground and crystallized ( Figure 5 ).…”

Section: Development Of New Synthetic Routesmentioning

confidence: 99%

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Recent advances in the synthesis of TS-1 zeolite

Luan

Cheng

et al. 2022

Front. Chem.

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Heteroatomic zeolites as an important class of zeolites, have been widely applied in industrially catalytic processes due to their unique properties. As one of the most representative heteroatomic zeolites, titanosilicate zeolites have been extensively used in the selective oxidations of organic substrates with H2O2 such as cyclohexanone ammoximation, epoxidation of alkenes, and phenol hydroxylation. In this review, recent advances in the synthesis of TS-1 zeolite are briefly summarized, including use of low-cost raw materials (organic templates, silicon, and titanium sources), development of new synthesis routes (post-treatment synthesis, dry-gel conversion synthesis, solvent-free synthesis, and microwave-assisted synthesis), and new strategy for enhanced mass transfer in TS-1 crystals (synthesis of hierarchical and nanosized TS-1 zeolite). This review might help researchers to have a deep understanding on the synthesis of TS-1 zeolite and provide a new opportunity for the design and preparation of highly efficient TS-1 catalysts in the future.

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Silica‐Based Materials as Catalysts or Supports in Solvent‐Free Organic Reactions

Vilé

Len

2023

Solvent‐Free Methods in Nanocatalysis

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Scheme 5.1 The nitration of m-cresol using 69% nitric acid in the presence of silica gel. Source: Onitsuka et al. [12]/MDPI/CC BY.Recently, Skrotzki et al. reported the ozone-mediated primary amine and pyridine oxidations, CH hydroxylation, and arene oxidation in continuous flow process. In order to limit the overoxidation of substrates and solvent, primary amines were absorbed onto silica gel and then ozone was flowed to the system at −60 ∘ C for a residence time of 15 minutes. Application of this method afforded the target nitro compounds in good yields (Scheme 5.2) [13].The same group reported the continuous flow synthesis of N-oxides at −60 ∘ C for 15 minutes, quaternary alcohols at −20 ∘ C for 60 minutes, and carboxylic acid at −20 ∘ C for 60 minutes (Figure 5.2).

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Fully utilizing seeds solution for solvent-free synthesized nanosized TS-1 zeolites with efficient epoxidation of chloropropene

Cited by 10 publications

References 64 publications

Removal of Gaseous H₂S by the Titanium Silicalite-1/H₂O₂ Wet Oxidation System

Removal of Gaseous H₂S by the Titanium Silicalite-1/H₂O₂ Wet Oxidation System

Recent advances in the synthesis of TS-1 zeolite

Silica‐Based Materials as Catalysts or Supports in Solvent‐Free Organic Reactions

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Fully utilizing seeds solution for solvent-free synthesized nanosized TS-1 zeolites with efficient epoxidation of chloropropene

Cited by 10 publications

References 64 publications

Removal of Gaseous H2S by the Titanium Silicalite-1/H2O2 Wet Oxidation System

Removal of Gaseous H2S by the Titanium Silicalite-1/H2O2 Wet Oxidation System

Recent advances in the synthesis of TS-1 zeolite

Silica‐Based Materials as Catalysts or Supports in Solvent‐Free Organic Reactions

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Product

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Removal of Gaseous H₂S by the Titanium Silicalite-1/H₂O₂ Wet Oxidation System

Removal of Gaseous H₂S by the Titanium Silicalite-1/H₂O₂ Wet Oxidation System