Fabrication of Super-Hydrophobic Titanosilicate Sub-micro Sphere with Enhanced Epoxidation Catalytic Activity

Li, Sha; Zhou, Hui; Xiao, Liping; Fan, Jie; Zheng, Xiaoming

doi:10.1007/s10562-019-02720-y

Cited by 3 publications

(3 citation statements)

References 32 publications

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“…The high epoxidation activity indeed displayed by these modified catalysts was attributed to their higher hydrophobic character [45,49,50]. The second approach is the functionalization of the catalyst surface with organic moieties by either post-grafting [28,46,[51][52][53][54][55] or one-pot functionalization [56][57][58][59][60][61][62]. Post-grafting of organosilanes was used to produce hydrophobic Ti-MCM-41 [51], Ti-SBA-15 [51,52].…”

Section: Of 19mentioning

confidence: 99%

“…Post-grafting of organosilanes was used to produce hydrophobic Ti-MCM-41 [51], Ti-SBA-15 [51,52]. Ti/SiO 2 [53,54], and Ti-SiO 2 [13]. These hydrophobic catalysts achieved higher yields in the epoxidation of cyclohexene with H 2 O 2 or 1-octene with tert-butyl hydroperoxide (TBHP), and some of them even demonstrated higher stability in the presence of water [13,54].…”

Section: Of 19mentioning

confidence: 99%

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Mesoporous Methyl-Functionalized Titanosilicate Produced by Aerosol Process for the Catalytic Epoxidation of Olefins

et al. 2021

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Titanosilicates (Ti-SiO2) are well-known catalysts for the epoxidation of olefins. Isolated Ti inserted in the silica framework in tetrahedral coordination are the active species. Recently, adjusting the hydrophobic/hydrophilic balance of such catalysts’ surfaces has appeared as a promising tool to further boost their performance. However, adjusting the hydrophobic/hydrophilic balance via a one-pot classical sol-gel generally leads to a decrease in the Ti dispersion and/or collapse of the pore network. To overcome this limitation, hydrophobic mesoporous Ti-SiO2 were here synthesized by aerosol-assisted one-pot sol–gel, which allowed the simultaneous control of their Ti loading, degree of methyl-functionalization, and textural properties. Methyl-functionalization was achieved by a partial substitution of tetraethoxy silane (TEOS) by methyltriethoxy silane (MTES) in different ratios. Solid-state 29Si-NMR, FTIR, TGA, and vapor-phase water adsorption showed that methyl moieties were effectively incorporated, conferring a hydrophobic property to the Ti-SiO2 catalysts. ICP-AES, DRUV, XPS, and N2 physisorption demonstrated that Ti dispersion and textural properties were both successfully preserved upon the incorporation of the methyl moieties. In the epoxidation of cyclooctene with tert-butyl hydroperoxide as oxidant, the hydrophobic Ti-SiO2 showed higher catalytic performance than pristine Ti-SiO2 prepared without MTES. In addition to disentangling the positive effect of adjusting the hydrophobic/hydrophilic balance of epoxidation catalysts on their performance, this contribution highlights the advantages of the aerosol procedure to synthesize mesoporous functionalized catalysts with very high dispersion of active sites.

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Section: Of 19mentioning

confidence: 99%

Section: Of 19mentioning

confidence: 99%

Mesoporous Methyl-Functionalized Titanosilicate Produced by Aerosol Process for the Catalytic Epoxidation of Olefins

et al. 2021

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“…This phenomenon is mainly due to the modification of ZnO nanoparticles by FAS-17. Due to the existence of C-F and C-H groups, FAS-17 can not only reduce the free energy on the surface of its ZnO nanoparticles, but also make it more soluble in organic solvents and avoid the occurrence of nanoparticle agglomeration [23,24]. The CA of FAS on a smooth plane is 109°, which has good hydrophobicity, and its molecules are easy to modify on the hydroxyl-rich surface [25,26].…”

Section: Characterizationsmentioning

confidence: 99%

Multi-Scale Superhydrophobic Anti-Icing Coating for Wind Turbine Blades

Bao¹,

He²,

Chen³

et al. 2021

Energy Engineering

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As a surface functional material, super-hydrophobic coating has great application potential in wind turbine blade anti-icing, self-cleaning and drag reduction. In this study, ZnO and SiO 2 multi-scale superhydrophobic coatings with mechanical flexibility were prepared by embedding modified ZnO and SiO 2 nanoparticles in PDMS. The prepared coating has a higher static water contact angle (CA is 153°) and a lower rolling angle (SA is 3.3°), showing excellent super-hydrophobicity. Because of its excellent superhydrophobic ability and micro-nano structure, the coating has good anti-icing ability. Under the conditions of −10 C and 60% relative humidity, the coating can delay the freezing time by 1511S, which is 10.7 times slower than the normal freezing time. More importantly, due to the mechanical properties provided by SiO 2 and the synergistic effect of micro-nano particles, the coating has excellent mechanical durability. After 10 wear tests, the contact angle of the coating is still as high as 141°and the rolling angle is 6.8°. This research provides a theoretical reference for the preparation of a mechanically stable coating with a simple preparation process, as well as a basic research on the anti-icing behavior of the coating.

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