Protonated pentatitanate: preparation, characterizations and cation intercalation

Sasaki, Takayoshi; Komatsu, Yu; Fujiki, Yoshinori

doi:10.1021/cm00022a027

Cited by 90 publications

(79 citation statements)

References 7 publications

(8 reference statements)

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“…Calcination of residue is accompanied by desorption of intercalated water, which causes diminishing the interlayer distance in titanates as compared to TiO 2 TC model (Table 1). This result conforms to information of works [17,26]. However, there is desorption of mainly physically adsorbable water at the chosen temperature of calcination (300 °С) [26].…”

Section: Discussionsupporting

confidence: 91%

“…Second, doping atoms can occupy interstitial positions [14]. Third, atoms of metal and/or non-metal can take their place between the layers of TiO 2 (intercalation) [17,18] or take place on the internal and external surfaces of nanotubes. From a great number of doping TiO 2 cations, we have used Fe, Ni, Zn, Cd, Mn cations because titania Fe/TiO 2 [13], Mn/TiO 2 [13], Ni/TiO 2 [19], Zn/TiO 2 [20], Cd/TiO 2 [21] have high photocatalytic activity.…”

Section: Introductionmentioning

confidence: 99%

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Hydrothermal synthesis and properties of titania nanotubes doped with Fe, Ni, Zn, Cd, Mn

Kulish¹

2011

Semicond. Phys. Quantum Electron. Optoelectron.

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Abstract. Fe/TiO 2 , Mn/TiO 2 , Zn/TiO 2 , Cd/TiO 2 , Ni/TiO 2 titania nanotubes were synthesized by the method of direct hydrothermal synthesis. Their properties have been investigated using X-ray phase analysis and X-ray fluorescent analysis, high-resolution transmission electron microscopy, luminescent spectroscopy and Raman scattering. It has been ascertained that the Fe/TiO 2 , Mn/TiO 2 , Zn/TiO 2 , TiO 2 titania nanotubes possess the structure of Na 2 Ti 2 O 4 (OH) 2 . The structure of Cd/TiO 2 titania, probably, is mixture of anatase and rutile phases. We have found that Fe, Mn, Zn, Cd, Ni does not form solid solution with TiO 2 , and these metals are located in interlayer space. The mechanism of nanotube formation has been briefly discussed.

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Section: Discussionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Hydrothermal synthesis and properties of titania nanotubes doped with Fe, Ni, Zn, Cd, Mn

Kulish¹

2011

Semicond. Phys. Quantum Electron. Optoelectron.

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“…The band at 900 cm À1 is attributed to the four coordinated Ti-O stretching modes that stuck out into the interlayer spaces [18]. Notably, the as-synthesized K 2 Ti 6 O 13 is also recognized as K 2 O-6TiO 2 , a type of compounds with potassium inserting the layer of TiO 2 [19].…”

Section: Catalyst Characterizationmentioning

confidence: 98%

NO selective reduction by hydrogen on potassium titanate supported palladium catalyst

Zhang

Guan

et al. 2008

Catalysis Communications

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a b s t r a c tPotassium titanate (K 2 O-6TiO 2 ) nanowires were successfully prepared by alkali treatment of TiO 2 (79% anatase, 21% rutile) under autogenous pressure in a Teflon-lined autoclave at 200°C. After further modification with 1 wt.% Pd by wet impregnation, the calcined and pre-reduced Pd/K 2 O-6TiO 2 catalyst was applied for selective reduction of NO x by H 2 (H 2 -SCR) under lean conditions, together with Pd/Al 2 O 3 and Pd/TiO 2 as reference. The reference catalysts exhibited maximum NO conversion of about 50-60% at 100-130°C, but with low N 2 selectivity. The N 2 selectivity on Pd/K 2 O-6TiO 2 was considerably high, reaching 80% at maximum, with only 11% conversion of the admixed hydrogen reductant. In situ DRIFT spectroscopy revealed surface-fixed nitrates and Pd-bound NO, but no NH x ad-species. It is concluded, that the beneficial effect of the K 2 O-6TiO 2 support is due mainly to a stabilization of high Pd dispersion with enhanced concentration of Pd 0 -NO intermediates, and due to support alkalinity, that enhances nitrate fixation.

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“…[43][44][45][46][47][48] Regarding hydrated titania nanosheets, Sasaki and coworkers report the synthesis of nanosheets through exfoliation and delamination of hydrated titania flakes obtained through ion exchange.…”

Section: Formation Of Sheetlike and Ramiform Precipitatesmentioning

confidence: 99%

External-Field Hot-Water Treatments of Sol-Gel Derived SiO2-TiO2 Coatings for Surface Nanostructure Control-A Review-

Matsuda

Sakai

Kogure

et al. 2006

J. Ceram. Soc. Japan

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This review paper is focused on the area of titania nanocoatings prepared from sol-gel derived films by hot-water treatment under external reaction fields to design their functionality through the control of their surface morphology and crystallinity at low processing temperatures. First, the formation of titania nanocrystalline coatings at low temperatures by wet chemical procedures is briefly reviewed. Second, a concept of material design based on an external-field hot-water treatment for sol-gel derived films and the effects of the external fields on the formation of titania nanocrystals from the sol-gel derived films are discussed. Finally, promising characteristics of the resultant titania nanocrystal-dispersed coatings with unique morphology are described. External fileds of vibrations and electric voltages affect the nanostructure of titania crystallites formed on SiO 2 -TiO 2 gel coatings during hot-water treatment. Without the external fields granular anatase nanocrystals of 30-50 nm in size are formed on the coatings during the hot-water treatment, whereas the shape of the precipitates becomes sheetlike by applying a vibration to the substrate during hot-water treatment. Similar changes in shape of the precipitates on the coatings are also observed, and ramiform branchlike crystallites are formed at the negative electrode by applying an electric field between the substrates. The sheetlike and ramiform crystallites are mainly composed of a hydrated titania, mTiO 2 ऄnH 2 O, with the lepidocrocite-like layered structure with a d-spacing of 0.6-0.8 nm. Titania nanosheets are characterized by a large surface-to-volume ratio, which gives rise to the excellent wettability for water and antifogging properties. Processing temperatures for the preparation of the coatings are lower than 100c C under atmospheric pressure, so that the coatings have a great potential for applications to various substrates including organic polymers with poor heat resistance.

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Protonated pentatitanate: preparation, characterizations and cation intercalation

Cited by 90 publications

References 7 publications

Hydrothermal synthesis and properties of titania nanotubes doped with Fe, Ni, Zn, Cd, Mn

Hydrothermal synthesis and properties of titania nanotubes doped with Fe, Ni, Zn, Cd, Mn

NO selective reduction by hydrogen on potassium titanate supported palladium catalyst

External-Field Hot-Water Treatments of Sol-Gel Derived SiO2-TiO2 Coatings for Surface Nanostructure Control-A Review-

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