Hollow core–shell structured TS-1@S-1 as an efficient catalyst for alkene epoxidation

Wang, J.; Chen, Zuoqi; Yu, Yang; Tang, Zijie; Shen, Kaixu; Wang, R.; Liu, H.; Huang, Xingliang; Liu, Y.

doi:10.1039/c9ra07893b

Cited by 23 publications

(14 citation statements)

References 54 publications

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“…However, the FT-IR result of amorphous titanosilicate showed a much stronger absorption intensity with broadened bands at 3700–3200 cm –1 , indicating the presence of a much higher density of various hydroxyl groups compared to the other TS-1 samples (Figure S10). In addition to these, the amorphous titanosilicate showed strong bands at 1418 and 1580 cm –1 , which might come from the presence of a strong interaction of n -butyl amine with the Lewis acidic sites and Bronsted acidic sites . The FT-IR results thus suggested that the titanosilicate precursor (Scheme ; step 2) is amorphous; however, the resultant samples from the SAC presented evidence of the MFI structure.…”

Section: Resultsmentioning

confidence: 96%

In-Situ Growth of Embryonic TS-1 on Amorphous Silica via Steam-Assisted Crystallization: Correlation of Structural Properties and Catalytic Performance of Embryonic, Crystalline, and Amorphous Titanosilicate Catalysts

Shal

Tai

Goepel

et al. 2023

Crystal Growth & Design

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In-situ growth of supported embryonic TS-1 zeolite (<10 nm) on a silica support was achieved by steam-assisted crystallization (SAC). The use of low amounts of TPABr and steam at a moderate temperature of 130 °C was the key factor to control partial transformation of silica into supported embryonic TS-1. Compared with the reference crystalline TS-1, supported embryonic TS-1 exhibits a higher activity in dibenzothiophene (DBT) oxidation (TOF: 8−275 h −1 vs 2.7−160 h −1 at 30−98 °C), a higher resistance to poisoning by nitrogen-containing compounds, and a higher selectivity (>97%) in the productive utilization of the oxidant in DBT oxidation. The activity of the amorphous titanosilicate (TOF: 21.2−210 h −1 at 30−80 °C), the solid precursor of the SAC process, was higher than that of the embryonic and the crystalline TS-1. The analysis of the structural properties−catalytic performance of these catalysts showed an improved accessibility to defective Ti active sites "Ti(OH)(OSi) 3 " with higher catalytic activity. The results of this study should be encouraging to unearth many other active amorphous catalysts with the potential of industrial application.

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Section: Resultsmentioning

confidence: 96%

In-Situ Growth of Embryonic TS-1 on Amorphous Silica via Steam-Assisted Crystallization: Correlation of Structural Properties and Catalytic Performance of Embryonic, Crystalline, and Amorphous Titanosilicate Catalysts

Shal

Tai

Goepel

et al. 2023

Crystal Growth & Design

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“…The TS‐DHBDC‐48h before calcination displays strong characteristic signals at δ = 9.7, 15.4 and 62.8 ppm in Figure 5A, which are assigned to the three carbon species of template TPA + trapped in the zeolite channels. [ 53 ] In addition, the signals of carboxyl group and the C atoms in benzene of 2,5‐dihydroxyterephthalic acid are not detected, indicating that aromatic compounds are detached from TS‐1 during centrifugation following the supernate. This phenomenon proves that the inhibitory effect of DHBDC on the formation of anatase TiO 2 during crystallization and DHBDC is not incorporated into the framework of TS‐1.…”

Section: Resultsmentioning

confidence: 99%

Aromatic compounds‐mediated synthesis of anatase‐free hierarchical TS‐1 zeolite: Exploring design strategies via machine learning and enhanced catalytic performance

Wang

Lin

et al. 2023

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Simultaneous achievement of constructing mesopores and eliminating anatase is a long‐term pursuit for enhancing the catalytic performance of TS‐1. Here, we developed an aromatic compounds‐mediated synthesis method to prepare anatase‐free and hierarchical TS‐1 for olefin epoxidation. A series of hierarchical TS‐1 zeolites were prepared by introducing aromatic compounds containing different functional groups via the crystallization process. The formation of intercrystalline mesopores and insertion of titanium into framework were facilitated at different extent. The synergistic coordination of carboxyl and hydroxyl in aromatic compounds with Ti(OH)4 realizes the uniform distribution of titanium species and eliminates the generation of anatase. Noteworthily, eight machine learning models were trained to reveal the mechanism of additive functional groups and preparation conditions on anatase formation and microstructure optimization. The prediction accuracy of most models can reach more than 80%. Benefiting from the larger mesopore volumes (0.37 cm3·g−1) and higher content of framework Ti species, TS‐DHBDC‐48h samples exhibit a higher catalytic performance than other zeolites, giving 1‐hexene conversion of 49.3% and 1,2‐epoxyhenane selectivity of 99.9%. The paper provides a facile aromatic compounds‐mediated synthesis strategy and promotes the application of machine learning toward the design and optimization of new zeolites.

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“…[3,4] Among the various metal oxide nanoparticles, ZnO NPs have gained much attention. They are being used in cutting-edge research areas, which account for their wide range of applications in the field of electronics as semiconductors, [5,6] optics, [7] photocatalysts, [8,9] sensors, [10] coating agents in paints and ceramics, [11] as a catalyst in numerous organic reactions, [12] in cosmetics to treat various skin disorders, [13] In the biomedical field, as bioimaging agents, [14] as antibacterial, anti-fungal, and anti-cancer agents. [15][16][17] They are used as efficient adsorbents to remove pollutants.…”

Section: Introductionmentioning

confidence: 99%

Visible Light Driven Photodegradation of Pathological Effluents and Biological Evaluation of Green ZnO Nanoparticles

et al. 2022

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ZnO nanoparticles (NPs) are biosynthesized for the first time with the aqueous wheatgrass extract (WGE) using the solution combustion method. The synthesized nanoparticles were characterized by XRD, SEM, TEM, DLS, TGA, UV‐Vis. and FTIR. The synthesized ZnO NPs were crystalline, having a wurtzite structure, with an average particle size of 25 nm, confirmed from TEM and DLS. The biosynthesized ZnO NPs from WGE has shown excellent activity against Gram‐positive and Gram‐negative bacteria. They also exhibited good antioxidant and anti‐inflammatory activities with IC50 value of 4.63 μg/mL. When treated with MCF‐7 cell lines, these biosynthesized WGE ZnO NPs have shown a remarkable decline in the cell viability with IC50 value of 44.67 μg/mL. Under the visible light, crystal violet and safranin stains have shown excellent degradation at neutral pH without any reductant, indicating that these green WGE ZnO NPs can serve as a potential photocatalyst in treating wastewater effluents.

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Hollow core–shell structured TS-1@S-1 as an efficient catalyst for alkene epoxidation

Abstract: Hollow core–shell structured TS-1@S-1 with high catalytic performance was synthesized successfully owing to the formation of different titanium active centers.

Cited by 23 publications

References 54 publications

In-Situ Growth of Embryonic TS-1 on Amorphous Silica via Steam-Assisted Crystallization: Correlation of Structural Properties and Catalytic Performance of Embryonic, Crystalline, and Amorphous Titanosilicate Catalysts

In-Situ Growth of Embryonic TS-1 on Amorphous Silica via Steam-Assisted Crystallization: Correlation of Structural Properties and Catalytic Performance of Embryonic, Crystalline, and Amorphous Titanosilicate Catalysts

Aromatic compounds‐mediated synthesis of anatase‐free hierarchical TS‐1 zeolite: Exploring design strategies via machine learning and enhanced catalytic performance

Visible Light Driven Photodegradation of Pathological Effluents and Biological Evaluation of Green ZnO Nanoparticles

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