Synthesis and characterization of sintering resistant aerogel complex oxide powders

Lowe, D. M.; Gusman, Michael I.; McCarty, J.G.

doi:10.1016/s0167-2991(06)81781-7

Cited by 5 publications

(10 citation statements)

References 8 publications

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“…As a result, LA-CP2 and LA-SG had nearly the same surface areas after aging at 1300 and 1400 °C. The observed surface areas for LA-SG at different temperatures agree well with literature data (Lowe et al, 1995). The surface area of LA-CP1 (20 m 2 /g) at 1200 °C is similar to the value reported by Kato et al (Kato et al, 1988) (23.6 m 2 /g) for a material with a La:Al ratio of about 1:10, prepared by a similar coprecipitation method.…”

Section: Resultssupporting

confidence: 90%

“…This observation agrees with literature data. Lowe et al (1995) observed both LaAlO 3 and LaAl 11 O 18 phases in the case of a lanthanum-rich mixed complex oxide (Al/ La < 11), whereas LaAl 11 O 18 and R-Al 2 O 3 were observed for the aluminum-rich complex oxide, both prepared by sol-gel synthesis. Similar observations were made by Kato et al for a coprecipitated lanthanum aluminate (Kato et al, 1988).…”

Section: Resultsmentioning

confidence: 91%

“…Groppi et al (1993) recently achieved similar performance when preparing the manganese-substituted barium hexaaluminate using coprecipitation. Lowe et al (1995) prepared various complex oxide gel powders, of which lanthanum hexaaluminate (LaAl 11 O 18 ) showed the highest thermal stability. Alumina-containing spinels with Zn (Marion et al, 1991) and Mg, Ni, and Co (Marti et al, 1994) were also reported to be interesting.…”

Section: Introductionmentioning

confidence: 99%

“…Alumina-containing spinels with Zn (Marion et al, 1991) and Mg, Ni, and Co (Marti et al, 1994) were also reported to be interesting. Another class of thermostable materials are perovskites, e.g., LaAlO 3 (Lowe et al, 1995;Johansson et al, 1996;Marti et al, 1995) and SrZrO 3 (Lowe et al, 1995). Pyrochlores (A 2 B 2 O 7 ) exhibit high chemical stability at high temperatures (Ashcroft et al, 1989), and their use as combustion catalysts was recently suggested (Ramesh et al, 1994).…”

Section: Introductionmentioning

confidence: 99%

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Thermal Stability of Complex Oxide Combustion Catalyst Supports

Zwinkels

Druesne

Menon

et al. 1998

Ind. Eng. Chem. Res.

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As part of a search for more thermostable supports for combustion catalysts for gas turbine applications, a series of complex oxide materials were prepared by sol−gel synthesis and two different coprecipitation routes. The materials were chosen on the basis of literature studies; two hexaaluminates (LaAl11O18 and BaMnAl11O19 - α), a perovskite (SrZrO3), a spinel (MgAl2O4), and a pyrochlore (La2Zr2O7). After synthesis, the materials were aged for 16 h in a flow of humid air at temperatures between 1100 and 1400 °C, simulating the actual conditions in a catalytic combustor. The aged samples were characterized by X-ray diffraction, nitrogen adsorption for determination of BET surface area, and scanning electron microscopy. The sol−gel materials generally exhibited higher thermal stability than their coprecipitated counterparts. One exception was LaAl11O18, which had the highest surface area of all materials, 8 m2/g, after aging at 1400 °C, both for the sol−gel synthesized and one coprecipitated material. The reaction paths for the high-temperature solid-state reactions depended on preparation procedure and stoichiometry of the product.

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Thermal Stability of Complex Oxide Combustion Catalyst Supports

Zwinkels

Druesne

Menon

et al. 1998

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…Various heat-resistant materials have been tested as catalysts or catalyst supports in the high-temperature catalytic process, such as spinel [19], perovskites [20], and hexaaluminate [21,22] et al McCarty and co-workers [16,20] have investigated the sintering of a number of high-temperature supporting oxide powders and revealed that hexaaluminate powders have sintering resistance superior to all other oxide supports investigated, such as MgAl 2 O 4 spinel, LaAlO 3 , SrZrO 3 , and LaTiO 3 perovskites. Hexaaluminate materials exhibit stable phase composition up to 1600 • C and remarkable resistance to sintering and thermal shock.…”

Section: Introductionmentioning

confidence: 99%