Immobilised chiral inducer on Pt-based mesoporous titanate nanotubes as heterogeneous catalysts for enantioselective hydrogenation

Campos, Cristian H.; Torres, Cecilia C.; Osorio-Vargas, Paula; Mella, Claudio; Belmar, J.; Ruiz, Dóris; Fierro, José Luis García; Reyes, Patricio

doi:10.1016/j.molcata.2014.11.026

Cited by 9 publications

(5 citation statements)

References 54 publications

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“…Campos et al 41 synthesized a series of chiral porous titanate nanotubes on which 11-trimethoxysilyl cinchonidine (TMS-CD) was anchored via direct surface reaction. These hybrid solids served as supports and were loaded with 1 wt % Pt.…”

Section: Hydrogenation Of Co Bondsmentioning

confidence: 99%

Recent Progress in Heterogeneous Asymmetric Hydrogenation of C═O and C═C Bonds on Supported Noble Metal Catalysts

2017

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The ease of separation, simple regeneration, and the usually high stability of solid catalysts facilitating continuous production processes have stimulated the development of heterogeneous asymmetric hydrogenation catalysis. The simplest and so far most promising strategy to induce enantioselectivity to solid metal catalysts is their modification by chiral organic compounds, as most prominently represented by the cinchona-modified Pt and Pd catalysts for the asymmetric hydrogenation of activated C═O and C═C bonds. In this Review, we provide a systematic account of the research accomplished in the past decade on noble metal-based heterogeneous asymmetric hydrogenation of prochiral C═O and C═C bonds, including all important facets of these catalytic systems. The advances made are critically analyzed, and future research challenges are identified.

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Section: Hydrogenation Of Co Bondsmentioning

confidence: 99%

Recent Progress in Heterogeneous Asymmetric Hydrogenation of C═O and C═C Bonds on Supported Noble Metal Catalysts

2017

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“…All of these changes are responsible for the excellent performance of titanate nanotubes. Nanotubular TiO 2 based catalyst were synthesized for the enantioselective hydrogenation of 1-phenyl-1,2-propanedione (PPD) [400]. Cinchonidine was tethered directly with prior silanisation modification over activated TNTs.…”

Section: Titanate Nanowires and Nanotubes As Supports In Catalytic Rementioning

confidence: 99%

Atomic scale characterization and surface chemistry of metal modified titanate nanotubes and nanowires

Kukovecz

Kordás

Kiss

2016

Surface Science Reports

104

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Titanates are salts of polytitanic acid that can be synthesized as nanostructures in a great variety concerning crystallinity, morphology, size, metal content and surface chemistry.Titanate nanotubes (open-ended hollow cylinders measuring up to 200 nm in length and 15 nm in outer diameter) and nanowires (solid, elongated rectangular blocks with length up to 1500 nm and 30-60 nm diameter) are the most widespread representatives of the titanate nanomaterial family. This review covers the properties and applications of these two materials from the surface science point of view. Dielectric, vibrational, electron and X-ray spectroscopic results are comprehensively discussed first, then surface modification methods including covalent functionalization, ion exchange and metal loading are covered. The versatile surface chemistry of onedimensional titanates renders them excellent candidates for heterogeneous catalytic, photocatalytic, photovoltaic and energy storage applications, therefore, these fields are also reviewed.

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“…The absorption peak of as-synthesized BML and LML at 2880–2950 cm −1 is attributed to the C–H stretch vibration of –CH 2 . 12 The peaks at 3288 cm −1 (BML), 3269 cm −1 (CML) are assigned to the characteristic absorption of hydroxyl, and the peaks at 2922 cm −1 (BML), 2938 cm −1 (CML) are saturated C–H bond, 1370 cm −1 belong to methylene. The peaks at 1450, 1500, and 750 cm −1 correspond to the benzene ring stretch vibration.…”

Section: Experiments Results and Discussionmentioning

confidence: 99%

Tribological study of OH- and N-containing imidazoline derivatives as additives in water–glycol

Liu

Han

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part J:

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Tribological properties of two hydroxyl- and only active nitrogen-containing water-soluble imidazoline derivatives, benzotriazole-containing imidazoline (BML) and caprylic acid-containing imidazoline (CML), as lubrication additive in water–glycol hydraulic fluid were evaluated with a four-ball tester. And the antirust and anticorrosion behaviors were also investigated. Results show that BML and CML were able to remarkably improve the antirust properties of water–glycol fluid when added at a low adding concentration, and also these performances of BML was better than CML. All additives exhibited good extreme pressure and antiwear properties, and BML showed better tribological properties than CML. Besides, the difference in the tribological and anticorrosion properties of these derivatives was closely related to their different molecular structures. There exists a synergistic tribological effect between benzotriazole and imidazoline group in the tribological and antiwear performances. Furthermore, significant improvement in the tribological performances of BML was detected and attributed to organic nitrogen compounds, iron oxide, and so on in tribofilm on the worn surfaces.

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Immobilised chiral inducer on Pt-based mesoporous titanate nanotubes as heterogeneous catalysts for enantioselective hydrogenation

Cited by 9 publications

References 54 publications

Recent Progress in Heterogeneous Asymmetric Hydrogenation of C═O and C═C Bonds on Supported Noble Metal Catalysts

Recent Progress in Heterogeneous Asymmetric Hydrogenation of C═O and C═C Bonds on Supported Noble Metal Catalysts

Atomic scale characterization and surface chemistry of metal modified titanate nanotubes and nanowires

Tribological study of OH- and N-containing imidazoline derivatives as additives in water–glycol

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