Characterization of titanium silicalite-1 prepared from aqueous TiCl3

Gao, Hanfei; Lu, Wenkui; Chen, Qingling

doi:10.1016/s1387-1811(99)00183-3

Cited by 29 publications

(17 citation statements)

References 15 publications

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“…As mentioned in the characterization of SiNS, the band at 1087 cm −1 , and shoulder at 1220 cm −1 , were assigned to the Si–O–Si asymmetric stretching. Of particular interest, (3)Ti-SiNS gave an almost featureless vibrational band at 949 cm −1 , indicating pore deficiencies on the interaction of octahedral Ti; this is in agreement with the literature [ 46 , 47 ].…”

Section: Resultssupporting

confidence: 91%

Direct-Continuous Preparation of Nanostructured Titania-Silica Using Surfactant-Free Non-Scaffold Rice Starch Template

2018

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The conventional synthesis route of nanostructured titania-silica (Ti-SiNS) based on sol-gel requires the use of a surfactant-type template that suffers from hazardous risks, environmental concerns, and a tedious stepwise process. Alternatively, biomaterials have been introduced as an indirect template, but still required for pre-suspended scaffold structures, which hinder their practical application. Herein, we report an easy and industrially viable direct-continuous strategy for the preparation of Ti-SiNS from nanostructured-silica (SiNS) using a hydrolyzed rice starch template. This strategy fits into the conventional industrial process flow, as it allows starch to be used directly in time-effective and less complicated steps, with the potential to upscale. The formation of Ti-SiNS is mainly attributed to Ti attachment in the SiNS frameworks after the polycondensation of the sol-gel composition under acidic-media. The SiNS had pseudo-spherical morphology (nanoparticles with the size of 13 to 22 nm), short order crystal structure (amorphous) and high surface area (538.74 m2·g−1). The functionalized SiNS into Ti-SiNS delivered considerable catalytic activity for epoxidation of 1-naphtol into 1,4-naphthoquinone. The described direct-continuous preparation shows great promise for a cheap, green, and efficient synthesis of Ti-SiNS for advanced applications.

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Section: Resultssupporting

confidence: 91%

Direct-Continuous Preparation of Nanostructured Titania-Silica Using Surfactant-Free Non-Scaffold Rice Starch Template

2018

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“…Zeolites were added to the solution and dried at 50 • C for 3 h and then at 120 • C overnight. The final calcination temperature was 450 • C in an oven for 12 h [28]. For the other preparing method, titanium(IV) tetraisopropoxide was dissolved in ethanol overnight.…”

Section: Etching and Coating Processesmentioning

confidence: 99%

“…Lower chlorinated biphenyls (lower congener numbers) were identified through the continuous dechlorination of congener 138. PCB congeners 99, 87, 66, 49,28,17,9,and 7 were detected as a result of dechlorination from higher chlorinated congeners to lower chlorinated congeners along with the extension of exposure times. The concentrations of chloride ion were increased with increasing exposure time through dechlorination, while the concentrations of organic chlorine of congener 138 were decreased.…”

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confidence: 99%

Photocatalysis of 2,2′,3,4,4′,5′-hexachlorobiphenyl and its intermediates using various catalytical preparing methods

Lin

Chen

Huang

et al. 2006

Journal of Hazardous Materials

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“…Ti(η5 -C 5 HMe 4 )Cl 2 -CyPTS-MTMS-MCM-41 13. C CP/ MAS NMR δ=-7 (O 3 -Si(CH 3 )), 10 (O-CH 2 -CH 2 -CH 2 -Si), 12 (η 5 -C 5 HMe 4 ), 18 (Si(OCH 2 CH 3 ), 22 (O-CH 2 -CH 2 -CH 2 -Si), 48 (O 2 -Si(CH 3 )(OCH 3 )), 51 (O-CH 2 -CH 2 -CH 2 -Si), 58 49/47 Ti NMR Chemical Shifts and Line Widths of Titanium Complexes in Solution and Solid-State (1-14) and Heterogenized Titanium Materials(15)(16)(17)(18)(19)(20)(21) The data reported are related back to the TiCl 4 primary shift reference.…”

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confidence: 99%

Solid-State ^49/47Ti NMR of Titanium-Based MCM-41 Hybrid Materials

et al. 2009

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Titanium solid-state NMR spectroscopy data for a series of organic-inorganic titanium MCM-41 based materials have been collected. These materials have been synthesized by first modifying the mesoporous silica MCM-41 in one step with a mixture of silanes: a triazine propyl triethoxysilane acting as functional linker and methyltrimethoxysilane or hexamethyldisilizane as capped agents to mask the remaining silanol groups. Second, the appropiate titanium precursor Ti(OPr(i))(4), [{Ti(OPr(i))(3)(OMent)}(2)] (OMent = 1R,2S,5R-(-)-menthoxo), Ti(OPr(i))(4), or [Ti(eta(5)-C(5)HMe(4))Cl(3)], has been immobilized by reaction with the modified MCM-41. Finally, after Ti(OPr(i))(4) immobilization onto the organomodified support the reaction with the chiral (+)-diethyl-l-tartrate was accomplished. The materials without functional linker have been also prepared by reaction in one step of the capped agent and the titanium precursor with the mesoporous silica. Relevant correlations of titanium NMR resonance chemical shifts and line widths can be inferred depending on different factors. The immobilization procedure used to prepare titanium-based MCM-41 hybrid materials and the choice of the silylating reagents employed to mask the silanol groups present on the silica surfaces produce significant differences in the Ti NMR spectra. Furthermore, depending on the electronic and sterical influence of the substituents directly attached to the titanium center, chemical shifts and line widths are modified providing novel information about titanium structure.

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Characterization of titanium silicalite-1 prepared from aqueous TiCl3

Cited by 29 publications

References 15 publications

Direct-Continuous Preparation of Nanostructured Titania-Silica Using Surfactant-Free Non-Scaffold Rice Starch Template

Direct-Continuous Preparation of Nanostructured Titania-Silica Using Surfactant-Free Non-Scaffold Rice Starch Template

Photocatalysis of 2,2′,3,4,4′,5′-hexachlorobiphenyl and its intermediates using various catalytical preparing methods

Solid-State ^49/47Ti NMR of Titanium-Based MCM-41 Hybrid Materials

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Characterization of titanium silicalite-1 prepared from aqueous TiCl3

Cited by 29 publications

References 15 publications

Direct-Continuous Preparation of Nanostructured Titania-Silica Using Surfactant-Free Non-Scaffold Rice Starch Template

Direct-Continuous Preparation of Nanostructured Titania-Silica Using Surfactant-Free Non-Scaffold Rice Starch Template

Photocatalysis of 2,2′,3,4,4′,5′-hexachlorobiphenyl and its intermediates using various catalytical preparing methods

Solid-State 49/47Ti NMR of Titanium-Based MCM-41 Hybrid Materials

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Solid-State ^49/47Ti NMR of Titanium-Based MCM-41 Hybrid Materials