One-step synthesis of phenol by O– and OH– emission material

Dong, Ting; Li, Jiang; Huang, Fan; Wang, Lian; Tu, Jian; Torimoto, Youshifumi; Sadakata, Masayoshi; Li, Quanxin

doi:10.1039/b419206k

Cited by 70 publications

(60 citation statements)

References 23 publications

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“…Dong et al reported that a direct oxidation of benzene using C12A7O ¹ yields phenol. 9) Wang et al also reported a production of hydrogen by catalytic steam reforming of bio-oil using C12A7O ¹ . 10) Yang et al reported partial oxidation of methane using C12A7O ¹ .…”

Section: )8)mentioning

confidence: 99%

Fabrication of 12CaO 7Al2O3 powders with high specific surface area by sol-gel and ball-milling method

Ozawa

Sakamoto

Wakiya

et al. 2011

J. Ceram. Soc. Japan

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4+ cages in which oxide anions are entrapped. Recent studies have revealed that the outstanding characteristics appear by exchanging the free oxide anions in the cages by various other anion species. In the present report, in order to enhance the oxidative catalytic activity of C12A7 by the encaged oxygen radicals, we synthesized C12A7 fine powders with high-specific surface area by solgel method and subsequent ball-milling. Aluminum secbutoxide, calcium nitrate tetrahydrate, absolute ethanol, 1 M hydrochloric acid, and ethyl 3-oxobutanate were used as raw materials. The obtained precursor solution was dried at 100°C for 24 h, and the product obtained was annealed at 900°C in O 2 atmosphere. Planetary ball milling was subsequently applied to the C12A7 powders. The XRD measurements revealed that the synthesized sample was a single phase C12A7. The BET specific surface area of the ground samples was 48.9 m 2 /g (24 h ground) and 17.3 m 2 /g (36 h ground) for those prepared by solgel method and by solid state reaction, respectively. The possibility was thus demonstrated on the synthesis of C12A7 fine powders with higher specific surface area by solgel method and subsequent planetary ball-milling.

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Section: )8)mentioning

confidence: 99%

Fabrication of 12CaO 7Al2O3 powders with high specific surface area by sol-gel and ball-milling method

Ozawa

Sakamoto

Wakiya

et al. 2011

J. Ceram. Soc. Japan

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“…The C12A7-O -sample was prepared by a solid-state reaction at 1623 K for 16 h. The more detailed process for preparation can be found elsewhere [22,23,38,39]. The C12A7-O -pellet was powdered and mechanically mixed with various content of K 2 CO 3 .…”

Section: Catalyst Preparationmentioning

confidence: 99%

“…For example, C12A7 has been used as a catalyst mainly in the pyrolysis of n-hexane [31], n-heptane [32][33][34], methylcyclohexane [35] and partial oxidation of methane [36,37]. More recently, we found the C12A7-O -catalyst was active in hydroxylation of benzene [38] and steam reforming of bio-oil [39].…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Production by Steam Reforming of Ethanol on Potassium-Doped 12CaO · 7Al2O3 Catalyst

et al. 2007

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The performance of hydrogen production from steam reforming of ethanol were investigated by using the K-doped 12CaO Á 7Al 2 O 3 catalyst (defined as C12A7-O -/ x%K). The conversion of ethanol and hydrogen yield over C12A7-O -/x%K catalyst mainly depended on the temperature, K-doping amount, steam-to-carbon ratios (S/C) and contact time (W/F). In order to identify the catalyst's characteristic and active species on the catalyst's surface, Brunauer-Emmett-Teller (BET) surface area, CO 2 temperature programmed desorption (CO 2 TPD), X-ray diffraction (XRD), Fourier transform infrared (FT-IR) and X-ray photoelectron spectroscopy (XPS) were carried out. Based on the characterization, it was found that active oxygen species and doped potassium play important roles in steam reforming of ethanol over C12A7-O -/27.3%K catalyst.

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“…Many 176 Liquid-phase oxidation reactions of benzene with molecular oxygen have been reported on an iron-heteropolyacid catalyst and a CuO/Al 2 O 3 catalyst with ascorbic acid as a reducing reagent. 148,149 A Cu/ ZSHM-5 catalyst showed a maximum phenol selectivity of 60% with a phenol yield of 1.2% at 673 K. 150 However, the selective oxidation of benzene using O 2 was nominated as one of the ten most difficult challenges in catalysis 177179 and indeed there have been no reports on direct remarkable catalysts for phenol synthesis with performance greater than 5% benzene conversion and 50% phenol selectivity over the last 50 years.…”

Section: Tadamentioning

confidence: 99%

Surface-Mediated Design and Catalytic Properties of Active Metal Complexes for Advanced Catalysis Creation

Tada¹

2010

Bulletin of the Chemical Society of Japan

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Molecular-scale design of catalytically active structures at oxide surfaces is highlighted, focusing on our recent challenges for selective heterogeneous catalysis. We found novel structural transformations of supported metal complexes on oxide surfaces and achieved unique selective catalysis for various chemical syntheses. In this account, the advanced design of supported metal-complex catalysts on oxide surfaces and the in situ characterization of their structural kinetics, which means kinetics of structural changes of catalysts themselves, under catalyst-working conditions are reviewed. Surface-Mediated Design of Catalytically ActiveStructures for Selective Catalysis 1.1 Introduction: Metal-Complex Attaching on Oxide Surfaces. Heterogeneous solid catalysts have been widely utilized for the industrial production of many synthetic chemicals. The advantages of heterogeneous catalysts are not only the separation of catalysts and products from reaction media but also their high durability and catalytic activities resulting from the unique structures of catalytically active sites at solid surfaces. Relationships among the metal structures, organized environment, and the catalytic properties of surface species tell us the nature of catalysis and new strategy for rational design of heterogeneous catalysts.Metal-complex attachment to oxide surfaces is a practical way to produce molecularly regulated structures of active metal species on oxide surfaces, and subsequent structural transformation in a controllable manner often provides unique regulated metal structures active for selective catalytic reactions. 116 There are several types of metal-complex attachment techniques: coordination of metal-complex precursors to immobilized ligands on organic polymers, 1721 coordination of metal-complex precursors to functional ligands bound to oxide surfaces, 2,4,2225 intercalation into clay materials, 26 ion exchange into porous materials such as zeolite and mesoporous silica, 27 and direct attachment of metal-complex precursor onto oxide surfaces. 3,6,11,28,29 The interfacial attachment between a metal complex and an oxide surface can produce unique metal coordination different from the original metal-complex precursor. For example, SiOH is reacted with a M(CH 3 ) complex and a M(OSi) complex is produced, releasing CH 4 . A chemical bond between a metal-complex precursor and a support surface modifies the reactivity of the supported metal complex, resulting in novel catalytic activity the precursor complex does not exhibit. 3,6,11,28,29 Traditional ion-exchange on zeolites and intercalation to clay materials are also typical ways to introduce metal species onto solid supports although the valences and types of metal precursors are restricted. 4 Direct reactions of metal-complex precursors and hydroxy groups on oxide surfaces create novel metal-coordination structures, and many important factors for selective catalysis can be controlled at the interface, such as electronic properties and coordination sphere of the attached metal...

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One-step synthesis of phenol by O– and OH– emission material

Cited by 70 publications

References 23 publications

Fabrication of 12CaO 7Al2O3 powders with high specific surface area by sol-gel and ball-milling method

Fabrication of 12CaO 7Al2O3 powders with high specific surface area by sol-gel and ball-milling method

Hydrogen Production by Steam Reforming of Ethanol on Potassium-Doped 12CaO · 7Al2O3 Catalyst

Surface-Mediated Design and Catalytic Properties of Active Metal Complexes for Advanced Catalysis Creation

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