Oxidation of 1,4‐Dioxane over Ti‐MWW in the Presence of H<sub>2</sub>O<sub>2</sub>

Fan, Wei; Kubota, Yoshihiro; Tatsumi, Takashi

doi:10.1002/cssc.200700003

Cited by 22 publications

(14 citation statements)

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“…It exists in its liquid state at ordinary temperature, and its boiling point is 101 ℃ [1] which is almost equivalent to that of water (100 ℃). 1,4-dioxane has been used as a solvent for extraction, purification and chemical reaction [2][3][4], but it has been identified as a cancer-causing pollutant by animal testing [5]. Therefore, a stringent environmental quality standard for water pollution has been established for 1,4-dioxane: for example, it is 0.05 mg/L or below in Japan [6].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, a stringent environmental quality standard for water pollution has been established for 1,4-dioxane: for example, it is 0.05 mg/L or below in Japan [6]. Unfortunately, however, 1,4-dioxane is a persistent substance not to be susceptible to hydrolysis and biodegradation [4,7]. Accordingly, it is significantly difficult to eliminate 1,4-dioxane with microbial processes at wastewater treatment plants [8].…”

Section: Introductionmentioning

confidence: 99%

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Catalytic liquid phase oxidation of 1,4-dioxane over a Pt/CeO2-ZrO2-Bi2O3/SBA-16 catalyst

et al. 2015

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Abstract:A Pt/CeO 2 -ZrO 2 -Bi 2 O 3 /SBA-16 (Santa Barbara Amorphous No. 16) catalyst was prepared by hydrothermal and wet impregnation methods for catalytic purification of 1,4-dioxane in water. SBA-16 has a number of mesopores and the average size of the pores is 9.4 nm. In the present catalyst, platinum and CeO 2 -ZrO 2 -Bi 2 O 3 were successfully dispersed in the pores of the SBA-16 support, and the temperature dependence of the liquid phase oxidation of 1,4-dioxane was examined. The oxidation reaction proceeded effectively in the air atmosphere in the temperature range of 40-80 ℃.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Catalytic liquid phase oxidation of 1,4-dioxane over a Pt/CeO2-ZrO2-Bi2O3/SBA-16 catalyst

et al. 2015

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“…Ti-MWW catalysts have also been found to exhibit catalytic performance superior to conventional titanosilicates such as TS-1 and Ti-beta in other oxidation reactions, for example, epoxidation of allyl alcohol to glycidol [73], epoxidation of diallyl ether to allyl glycidyl ether [74], epoxidation of allyl chloride to epichlorohydrin [75], epoxidation of 2,5-dihydrofuran to 3,4-epoxytetrahydrofuran [76], hydroxylation of 1,4-dioxane to 1,4-dioxane-2-ol [77], and ammoximation of cyclohexanone to cyclohexanone oxime [78]. The catalytic performance of Ti-MWW in the liquid-phase ammoximation of cyclohexanone depends greatly on the operating conditions of the reaction, especially the method of adding H 2 O 2 .…”

Section: Ti-mwwmentioning

confidence: 99%

Metals in Zeolites for Oxidation Catalysis

Tatsumi

2010

Zeolites and Catalysis

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Zeolites have long been used as solid acid catalysts. The fluid catalytic cracking of heavy fractions of petroleum by the use of Y-type zeolites included in catalyst matrices is the world's largest catalytic process. Acidic zeolites have also widely replaced mineral and Lewis acids in large-scale chemical manufacturing such as alkylation of aromatics and the Beckmann rearrangement. Zeolites are also endowed with the redox property by the incorporation of a variety of metals, and this chapter deals with incorporation of metals and the resultant oxidation catalysis.The ways to introduce heteroatoms into zeolites are classified into two categories: heteroatoms can be introduced into the framework as well as into voids as extraframework species. Most zeolites have an intrinsic ability to exchange cations [1]. This ability to exchange is a result of isomorphous substitution of a cation of trivalent (mostly Al) or lower charges for Si as a tetravalent framework cation. As a consequence of this substitution, a net negative charge develops on the framework of the zeolite, which has to be neutralized by cations present within the channels or cages that constitute the microporous part of the crystalline zeolite. These cations may be any of the metals, metal complexes, or alkylammonium cations. If these cations are transition metals with redox properties, they can act as active sites for oxidation reactions. As a pioneering work, Wacker-type reactions were catalyzed by Y zeolite into which Pd 2+ and Cu 2+ were incorporated by ion exchange [2].Research on coordination chemistry in zeolites started in 1970s and early work was summarized by Lunsford [3]. A metal complex of the appropriate dimensions can be encapsulated in a zeolite, being viewed as a bridge between homogeneous and heterogeneous systems. Complexes that are smaller than the free diameters of the channels and windows have access to the cavities. On the other hand, complexes that are larger than the diameters of the windows must be synthesized in situ, namely, by the adsorption of the ligands into the zeolites containing transition metal ions or by the synthesis of the ligands in those zeolites [4][5][6]. Herron et al. first referred to such zeolite guest molecules as ship-in-a-bottle complexes [7]. Cationic complexes can be tethered to zeolites through the electrostatic interaction. However,

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“…To overcome these problems, immobilization of homogeneous metal catalysts by anchoring on various substrates, such as polymers, silica, zeolites and carbon nanotubes can be used for minimizing toxic species from chemical processes. These substrates facilitate work‐up of the reaction and recycling of the catalyst, which recently have been introduced as an important research field to achieve green catalyst systems.…”

Section: Introductionmentioning

confidence: 99%

Copper nanoparticles supported on 2‐methoxy‐1‐phenylethanone‐functionalized MCM‐41: An efficient and recyclable catalyst for one‐pot three‐component C–S coupling reaction of aryl halides with benzyl bromide and thiourea

Hajipour

Fakhari

Bidhendi

2019

Applied Organom Chemis

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An environmentally friendly copper‐based catalyst supported on 2‐methoxy‐1‐phenylethanone‐functionalized MCM‐41 was prepared and characterized by Fourier transform‐infrared, transmission electron microscopy, field emission‐scanning electron microscopy, X‐ray diffraction and inductively coupled plasma techniques. The catalyst was applied for the one‐pot three‐component C–S coupling reactions of aryl halides with benzyl bromide and thiourea under aerobic conditions to afford the corresponding coupled products in good yields in water. The catalyst could be recovered and recycled five times. These results prove 2‐methoxy‐1‐phenylethanone‐functionalized MCM‐41 supported Cu (II) complex was not leached during the reaction. Also it shows the correct heterogeneous nature of the catalyst.

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Oxidation of 1,4‐Dioxane over Ti‐MWW in the Presence of H₂O₂

Cited by 22 publications

References 14 publications

Catalytic liquid phase oxidation of 1,4-dioxane over a Pt/CeO2-ZrO2-Bi2O3/SBA-16 catalyst

Catalytic liquid phase oxidation of 1,4-dioxane over a Pt/CeO2-ZrO2-Bi2O3/SBA-16 catalyst

Metals in Zeolites for Oxidation Catalysis

Copper nanoparticles supported on 2‐methoxy‐1‐phenylethanone‐functionalized MCM‐41: An efficient and recyclable catalyst for one‐pot three‐component C–S coupling reaction of aryl halides with benzyl bromide and thiourea

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Oxidation of 1,4‐Dioxane over Ti‐MWW in the Presence of H2O2

Cited by 22 publications

References 14 publications

Catalytic liquid phase oxidation of 1,4-dioxane over a Pt/CeO2-ZrO2-Bi2O3/SBA-16 catalyst

Catalytic liquid phase oxidation of 1,4-dioxane over a Pt/CeO2-ZrO2-Bi2O3/SBA-16 catalyst

Metals in Zeolites for Oxidation Catalysis

Copper nanoparticles supported on 2‐methoxy‐1‐phenylethanone‐functionalized MCM‐41: An efficient and recyclable catalyst for one‐pot three‐component C–S coupling reaction of aryl halides with benzyl bromide and thiourea

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Oxidation of 1,4‐Dioxane over Ti‐MWW in the Presence of H₂O₂