Easily recoverable micron-sized silica-walled TS-1 colloidosomes: Preparation and application as liquid-phase alkene epoxidation catalysts

Wang, Fumin; Zhang, Xubin

doi:10.1016/j.apcata.2017.09.001

Cited by 20 publications

(6 citation statements)

References 33 publications

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“…The TOF values for 1-hexene epoxidation are all larger than those for cyclohexene epoxidation, which may be due to the larger size of cyclohexene molecules and higher diffusion resistance. 26 In 1-hexene epoxidation, the TOF of the pristine HTS-1 particles is only 4.5 h −1 , lower than the values obtained for all the modified HTS-1 particles. The same applies to the epoxidation of cyclohexene.…”

Section: Pickering Emulsions Stabilized Bymentioning

confidence: 65%

“…The line-scan analyses displayed in Figure c confirm the successful preparation of HTS-1 particles and homogeneous distribution of Si and Ti on their surfaces. The X-ray photoelectron spectrum of Ti 2p plotted in Figure d demonstrates two Ti 2p 3/2 characteristic peaks at around 460.7 and 459.3 eV, which are attributed to tetrahedral and extraframework Ti, , respectively, and two Ti 2p 1/2 characteristic peaks centered at around 465.2 and 466.8 eV.…”

Section: Results and Discussionmentioning

confidence: 99%

“…In order to eliminate the effect of Ti amount on catalyst catalytic activity, we use the turnover frequency (TOF) to evaluate the catalytic activity and the corresponding TOF values for the HTS-1 particles are displayed in Figure 9. The TOF values for 1-hexene epoxidation are all larger than those for cyclohexene epoxidation, which may be due to the larger size of cyclohexene molecules and higher diffusion resistance 26 . In 1-hexene epoxidation, the TOF of pristine HTS-1 particles is only 4.5 h -1 , lower than the values obtained for all the modified HTS-1 particles.…”

Section: (D) 1-hexene and Cyclohexene Epoxidation In Pickering Emulsionsmentioning

confidence: 86%

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Surface-Active Hollow Titanosilicate Particles as a Pickering Interfacial Catalyst for Liquid-Phase Alkene Epoxidation Reactions

Wang

Zhang

et al. 2017

Langmuir

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The design of catalyst particles bearing excellent catalytic activity and suitable surface wettability is the key to successful application of Pickering interfacial catalysis. In this study, the epoxidation of 1-hexene and cyclohexene with aqueous hydrogen peroxide over hollow TS-1 (HTS-1) zeolite was studied as a probe reaction to investigate the influence of catalyst surface wettability on catalytic activity. Hydrophobized HTS-1 particles were fabricated via a postsynthesis desilication treatment with tetrapropylammonium hydroxide and a postsynthesis silylation treatment with hexamethyldisiloxane (HMDSO). The successful preparation of HTS-1 particles was verified by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy, and Fourier-transform infrared spectroscopy. X-ray diffraction patterns and ultraviolet-visible spectra confirmed that the hydrophobic modification had no effect on the zeolite structure of HTS-1 particles. Stable Pickering emulsions of aqueous hydrogen peroxide in either 1-hexene or cyclohexene could be prepared using HTS-1 particles as emulsifiers and confirmed by cryo-SEM images. The catalytic behavior in the obtained Pickering emulsions revealed a parabolic distribution of turnover frequency values with respect to the hydrophobization degrees with 0.2-HMDSO/HTS-1 particles possessing the maximum values of 20.6 h for 1-hexene epoxidation and 8.1 h for cyclohexene epoxidation. In addition, these 0.2-HMDSO/HTS-1 particles showed good reusability for more than five cycles.

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Section: Pickering Emulsions Stabilized Bymentioning

confidence: 65%

Section: Results and Discussionmentioning

confidence: 99%

Section: (D) 1-hexene and Cyclohexene Epoxidation In Pickering Emulsionsmentioning

confidence: 86%

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Surface-Active Hollow Titanosilicate Particles as a Pickering Interfacial Catalyst for Liquid-Phase Alkene Epoxidation Reactions

Wang

Zhang

et al. 2017

Langmuir

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“…The special structure of Cr‐PV is considered to affect the adsorption property, the specific surface area and porous feature of the as‐synthesized PV and Cr‐PV were determined by N 2 adsorption–desorption measurements (BET). As seen in Figure S1a, the results for PV and Cr‐PV show typical type IV isotherms with H4 hysteresis loops at high relative pressure range of P / P 0 = 0.45–0.99, 30 indicating that PV and Cr‐PV are all mesopores materials. The BET specific surface area of Cr‐PV (57.5 m 2 g −1 ) is higher than that of PV (30.7 m 2 g −1 ).…”

Section: Resultsmentioning

confidence: 88%

Adsorption removal of methyl violet from aqueous solution by chromium phosphovanadate

Zhai

Zou

Liu

et al. 2020

Surface & Interface Analysis

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An effective adsorbent for methyl violet (MV), chromium phosphovanadate (named as Cr-PV) nanomaterials, was prepared by a simple coprecipitation strategy. The microstructure and morphology of as-synthesized Cr-PV were characterized by SEM, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared (FTIR), respectively, which was confirmed as nanosheet shapes. The adsorption behavior for MV from aqueous solutions was systematically investigated. The kinetic and equilibrium results indicate that the adsorption process follows pseudo-second-order kinetic model and Langmuir isotherm, respectively. Compared with PV and commercially available activated carbon, Cr-PV has preferable adsorption property to MV. The maximum adsorption capacity can reach 123.81 mg g −1 at room temperature. The thermodynamic parameters such as Gibbs free energy (ΔG ο), enthalpy (ΔH ο), and entropy change (ΔS ο) show that the adsorption of MV is an endothermic and spontaneous process. Moreover, the adsorptive behavior between Cr-PV and MV is monolayer adsorption and electrostatic interaction mechanism. Cr-PV, as a promising adsorbent with high adsorption capacity and fast adsorption rate, shows great potential for the removal of MV from wastewater.

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“…The high activity and good recyclability of the MTS-3 catalyst can be ascribed to the elimination of diffusion limitation of the reactant and product through the intracrystalline super-micropores and intercrystalline aggregative mesopores. Thus, the deactivation caused by the adsorption and blocking effect will be avoided. ,− The unique structural features of the hierarchically porous TS-1 catalysts can greatly accelerate the diffusion rates of bulky reagents and products. The excellent catalytic activity and reusability show that the hierarchical MTS-3 zeolite is a promising candidate for industrial applications in deep desulfurization.…”

Section: Resultsmentioning

confidence: 99%

Hierarchically Nanoporous TS-1 Zeolites for Catalytic Oxidation Desulfurization of Liquid Fuels

Chen

Shen

et al. 2020

ACS Appl. Nano Mater.

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Hierarchically nanoporous titanosilicate TS-1 zeolites, comprising micropores (0.55 nm), super-micropores (1.6 nm), and mesopores (30 nm), have been prepared by hydrothermal crystallization and subsequent calcination, with polyvinyl butyral gel as the mesopore template. The optimal TS-1 catalyst shows excellent catalytic activity in the dibenzothiophene oxidation, due to the introduction of super-micropores and mesopores, facilitating the diffusion of both reactants and products. Additionally, the hierarchical TS-1 zeolite nanoparticles show superior stability and facile recyclability without post-treatment.

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Easily recoverable micron-sized silica-walled TS-1 colloidosomes: Preparation and application as liquid-phase alkene epoxidation catalysts

Cited by 20 publications

References 33 publications

Surface-Active Hollow Titanosilicate Particles as a Pickering Interfacial Catalyst for Liquid-Phase Alkene Epoxidation Reactions

Surface-Active Hollow Titanosilicate Particles as a Pickering Interfacial Catalyst for Liquid-Phase Alkene Epoxidation Reactions

Adsorption removal of methyl violet from aqueous solution by chromium phosphovanadate

Hierarchically Nanoporous TS-1 Zeolites for Catalytic Oxidation Desulfurization of Liquid Fuels

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