Selective oxidation of bulky organic sulphides over layered titanosilicate catalysts

Přech, Jan; Morris, Russell E.; Čejka, Jiřı́

doi:10.1039/c5cy02083b

Cited by 45 publications

(27 citation statements)

References 41 publications

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“…The oxidations of methyl phenyl sulfide (Aldrich, 99 %, Scheme top) were carried out at 30 °C in a 25 ml magnetically stirred round bottom three‐neck glass flask equipped with a Dimroth condenser (procedure taken from ref …”

Section: Methodsmentioning

confidence: 99%

“…The oxidations of methyl phenyl sulfide (Aldrich, 99 %, Scheme 2 top) were carried out at 30 8C in a 25 ml magnetically stirred round bottom three-neck glass flask equipped with a Dimroth condenser (procedure taken from ref. [28] ). Samples before reaction were activated at in air, at 450 8C for 90 min, cooled down in a desiccator and then transferred to the reaction flask.…”

Section: Modificationmentioning

confidence: 99%

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Incorporation of Ti as a Pyramidal Framework Site in the Mono‐Layered MCM‐56 Zeolite and its Oxidation Activity

et al. 2018

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MWW zeolite MCM‐56 with Al atoms on the surface was functionalized with Ti to produce pyramidal TiOH groups. This was carried out by removal of Al with nitric acid, calcination and treatment with titanium diisopropoxide bis(acetylacetonate) (Ti(acac)2 (i‐propoxide)2, Ti(acac)2OiPr2). Up to 0.7 % Ti was introduced. Using UV‐Vis spectroscopy three types of Ti moieties were identified in the uncalcined materials – tetrahedral in the framework, 5/6‐coordinated Ti on the surface, presumably in the vacated pyramidal sites, and oxide‐like clusters. The presence of TiOH on the surface was indicated by in situ measurement of UV‐Vis spectra during calcination. It showed the band at 290 nm, which disappeared at 500 °C, perhaps due to condensation with silanols. Catalytic oxidation tests were carried out with three samples containing 0.13, 0.36, and 0.70 % Ti and methyl phenyl sulfide and cis‐cyclooctene as model reactants. The study confirmed potential of the TiOH moieties in oxidation catalysis although their final form is not certain. Future studies will include increasing Ti content to enhance catalytic activity and better detection of this type of the Ti site.

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Section: Methodsmentioning

confidence: 99%

Section: Modificationmentioning

confidence: 99%

Incorporation of Ti as a Pyramidal Framework Site in the Mono‐Layered MCM‐56 Zeolite and its Oxidation Activity

et al. 2018

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“…The Ti-UTL and its derived catalysts, including Ti-IPC-1PI and Ti-IPC-2, also showed an excellent performance in the selective oxidation of bulky organic sulphides. [56] Ti-IPC-1PI showed comparable conversion to layered titanosilicate TS-1 in the oxidation of both methylphenyl sulphide and diphenyl sulphide. Ti-IPC-2 catalyst was less active than Ti-UTL and Ti-IPC-1PI, and it was even inactive in the oxidation of dibenzothiophene, because of a smaller pore size.…”

Section: Ti-utl Derived Titanosilicatementioning

confidence: 96%

“…[88] Subsequently, Ti-containing UTL zeolite was synthesized by traditional hydrothermal synthetic method, which was then subjected to the hydrolysis process giving layered zeolite Ti-IPC-1P. [55,56] Actually, it is lucky for the hydrolysis of UTL germanosilicate to get a lamellar zeolite, because the mature technique [89] widely applicable to the modification of layered materials can be readily employed to produce the structural derivatives of Ti-IPC-1P. As shown in Figure 2, four other titanosilicates were derived from Ti-UTL zeolite.…”

Section: Ti-utl Derived Titanosilicatementioning

confidence: 99%

Recent Progresses in Titanosilicates

2017

Chin. J. Chem.

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Titanosilicates, with tetrahedrally coordinated Ti 4＋ ions in highly crystalline zeolite frameworks, are a class of unique heterogeneous catalysts useful for the liquid-phase selective oxidation reactions. The great success of green Ti-zeolites/H 2 O 2 reaction system has aroused considerable scientific and industrial interests. The catalytic properties of titanosilicates relay on zeolite topologies, crystal morphology, the content and micro-environment of tetrahedral Ti 4＋ ions. The ever-growing needs for the oxidation catalysts in processing bulky molecules in petrochemical and fine chemical industries have set off a new tide of developing novel titanosilicates with significantly improved catalytic performance than traditional ones. This mini review summarizes recent progresses in developing the titanosilicates with novel topology, morphology as well as chemically modified micro-environment.

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“…Moreover, LTS-1 was immune to Ti leaching and irreversible deactivation in cyclohexene epoxidation with H 2 O 2 compared with the mesoporous Ti-MCM-41, because of the crystalline characteristics of catalyst. [ 149 ] On the other hand, tin-containing zeolite catalysts have been extensively investigated in the Baeyer-Villiger (B-V) oxidations and exhibited a unique catalytic behavior for activating the carbonyl group in ketones. [ 142 ] On the other hand, similar to the aluminosilicate MCM-22P, the delamination technique was applied to the layered precursor of titanosilicate, Ti-MWW-P, to produce the delaminated Del-Ti-MWW catalyst, which showed much larger specifi c surface area (791 to 997 m 2 g −1 ) and external surface area (225 to 255 m 2 g −1 ) than 3D Ti-MWW.…”

Section: Wileyonlinelibrarycommentioning

confidence: 99%

Recent Advances in the Synthesis and Application of Two‐Dimensional Zeolites

Sun

2016

Advanced Energy Materials

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traditional hydrothermal syntheses would produce intermediate materials with 2D feature, such as MCM-22P, [ 7,8 ] PREFER, [ 9 ] which are composed of crystalline zeolite layers with the unit-cell thickness stacking on top of each other in ordered or disordered patterns. [10][11][12][13][14][15] Unlike traditional 3D zeolites, the crystal growth of frameworks in 2D layered zeolites is restricted in one particular direction, leaving lots of hydroxyl groups on layer surface. As zeolites are normally defi ned as 3D materials that possess regular micropore systems and consist of TO 4 tetrahedra, layered zeolite precursors containing silanols could not be regarded as zeolites in the strictest sense, but they are broadly included in the family of zeolite materials. Thus, the as-synthesized 2D zeolites are often denoted as layered zeolite precursors (the typical examples are shown in Table 1 ), [7][8][9] which would transform into their 3D order/disorder counterparts after removing organic molecules and condesation of interlayer silanols via calcination. [ 10 ] In the early research stage, the layered zeolite precursors are discovered accidentally in traditional hydrothermal syntheses, because we have limited control over the traditional synthesis process due to the incomplete understanding of crystallization mechanism. At that stage, one of the most attractive features of 2D zeolites is that they could transform into zeolite materials with hierarchical architectures. In some cases, the traditional synthesis produces hierarchical layered material, such as MCM-56, [ 26 ] in which the crystalline zeolite layers disorderly stacked. Furthermore, the recognition that the obtained layered precursors could be modifi ed into various hierarchical zeolite structures (such as delaminated, pillared, interlayer expanded and others) make them signifi cantly different from conventional 3D zeolite materials with rigid structures. Thus, the construction of hierarchical zeolite materials from the perspective of 2D layered zeolite precursors is an important research aspect during the past few years.With the improved synthetic techniques, layered zeolites are not only increasing in number, but also expanding the notion in composition and structure. One remarkable breakthrough in recent years is the discovery of 2D MFI nanosheets with the single unit-cell thickness (about 2 nm), which is achieved by adopting Gemini-type bifunctional surfactants as organic structure-directing agent (OSDA) in hydrothermal synthesis. [ 49 ] The calcined MFI nanosheets become a special kind of hierarchical zeolites Two-dimensional (2D) zeolites, originating from lamellar precursors, are a special kind of porous materials, in which crystalline zeolite nanolayers are weakly assembled in one particular direction. As there is no covalentbond between layers, the stacking sequences could be manipulated and possibly controlled to derive a family of zeolitic materials with structural diversity. The research on 2D zeolites arises from the primary casual discovery during ...

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Selective oxidation of bulky organic sulphides over layered titanosilicate catalysts

Cited by 45 publications

References 41 publications

Incorporation of Ti as a Pyramidal Framework Site in the Mono‐Layered MCM‐56 Zeolite and its Oxidation Activity

Incorporation of Ti as a Pyramidal Framework Site in the Mono‐Layered MCM‐56 Zeolite and its Oxidation Activity

Recent Progresses in Titanosilicates

Recent Advances in the Synthesis and Application of Two‐Dimensional Zeolites

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