High-temperature catalyst supports and ceramic membranes: Metastability and particle packing

Nair, Padmakumar; Mizukami, Fujio; Okubo, Tatsuya; Nair, Jalajakumari; Keizer, Klaas; Burggraaf, A.J.

doi:10.1002/aic.690431316

Cited by 30 publications

(20 citation statements)

References 12 publications

(9 reference statements)

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“…Moreover, there are no substantial spaces for the TiO 2 grains to coarsen. In this case, the surface energies of TiO 2 grains increase significantly to be favorable for the formation of anatase [26]. It should be stated that in-depth understanding of the crystallization behaviors of TiO 2 films prepared by oxidation of sputtered and evaporated Ti films needs more elaborate investigations.…”

Section: Resultsmentioning

confidence: 96%

Crystallization behaviors of TiO2 films derived from thermal oxidation of evaporated and sputtered titanium films

Zhang

Chen

et al. 2009

Journal of Alloys and Compounds

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Section: Resultsmentioning

confidence: 96%

Crystallization behaviors of TiO2 films derived from thermal oxidation of evaporated and sputtered titanium films

Zhang

Chen

et al. 2009

Journal of Alloys and Compounds

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“…12 Commercially rutile and anatase are used, e.g., in pigment manufacturing, enamels, and electroceramics. 1 With increasing importance are the uses such as a catalyst support and a ceramic membrane at elevated temperatures, 13 as a gas sensor material following its atmosphere sensitive electrical response, 14 and in waste water purification wherein photocatalytic activity of the ceramic is utilized to turn harmful chemical species into other species. 15 Commercial titania is produced mainly by the gas-phase oxidation of titanium tetrachloride (TiCl 4 ) and by the sulfate process via liquid route.…”

Section: Introductionmentioning

confidence: 99%

Preparation of nanocrystalline titania powder via aerosol pyrolysis of titanium tetrabutoxide

et al. 1999

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Nanocrystalline titanium dioxide was prepared via aerosol pyrolysis of titanium alkoxide precursor at 200-580°C in air and in nitrogen atmospheres. Powders were characterized by x-ray diffraction, thermogravimetric analysis, Brunauer-EmmettTeller analysis, scanning electron microscopy, transmission electron microscopy, energy dispersive spectroscopy, x-ray fluorescence, Raman and infrared spectroscopy, and Berner-type low-pressure impactor. The anatase phase transition was initiated at 500°C in nitrogen and at 580°C in air. Under other conditions amorphous powders were observed and transformed to nanocrystalline TiO 2 via thermal postannealing. In air, smooth and spherical particles with 2-4-m diameter were formed with an as-expected tendency to convert to rutile in the thermal postannealings. In nitrogen, a fraction of the titanium tetrabutoxide precursor evaporated and formed ultrafine particles via the gas-to-particle conversion. At 500°C thermally stable anatase phase was formed in nitrogen. A specific surface area as high as 280 m 2 g −1 was observed for an as-prepared powder.

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“…Titania powders are typically used as pigments but can be used as a raw material in electronic and structural ceramics, or as a material for sensors, ceramic membranes [1 ± 3], adsorbents [4,5] and catalyst supports [6,7 ]. On a commercial scale, they are typically made in the liquid or gas phase by the sulfate and chloride processes, respectively.…”

Section: Introductionmentioning

confidence: 99%

Sol-Gel Synthesis and Spray Granulation of Porous Titania Powder

et al. 2001

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Bimodally porous titania powders with controlled phase composition and porosity made by wet chemical processes have been extensively investigated in our laboratory. This paper reviews experimental parameters affecting the phase and pore structure of these powders. Also, the effect of solution peptization on packing and coordination of particles is discussed. The unpeptized slurry and peptized sol were spray dried to make granules with controlled porosity and morphology. The properties of the product granules were dependent on the feed solution properties. In particular, granules from unpeptized slurry showed bimodal pore size distribution with rough surface attributed to hard aggregates. Granules from the peptized sol showed monomodal pore size distribution with smooth surface of well‐packed microstructures. Potential applications of these granules include adsorbents, catalyst carriers and packing for chromatographic columns.

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High-temperature catalyst supports and ceramic membranes: Metastability and particle packing

Cited by 30 publications

References 12 publications

Crystallization behaviors of TiO2 films derived from thermal oxidation of evaporated and sputtered titanium films

Crystallization behaviors of TiO2 films derived from thermal oxidation of evaporated and sputtered titanium films

Preparation of nanocrystalline titania powder via aerosol pyrolysis of titanium tetrabutoxide

Sol-Gel Synthesis and Spray Granulation of Porous Titania Powder

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