2004
DOI: 10.1016/j.jnoncrysol.2004.06.051
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Platinum supported on doped alumina catalysts for propulsion applications. Xerogels versus aerogels

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Cited by 36 publications
(11 citation statements)
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“…Balakrishnan and Gonzalez prepared aerogel and xerogel catalysts of platinum-alumina systems, and concluded that the aerogels were inferior in comparison to the corresponding xerogels as far as the surface area and metallic dispersion were concerned [7]. The comparison of aerogel and xerogel catalysts were also done by Courtheoux et al [8] and Popa et al [9]; for the catalytic propellant decomposition the aerogels showed lower activities, although they had superior properties compared with xerogels. Sault et al developed a platinum-alumina aerogel catalyst via a combination of inverse micelle technology with sol-gel processing [10]; although the aerogel exhibited higher turnover frequency for propane dehydrogenation than the xerogel, the Pt diameter and the BET surface area were much larger and smaller, respectively, for the aerogels.…”
Section: Introductionmentioning
confidence: 96%
“…Balakrishnan and Gonzalez prepared aerogel and xerogel catalysts of platinum-alumina systems, and concluded that the aerogels were inferior in comparison to the corresponding xerogels as far as the surface area and metallic dispersion were concerned [7]. The comparison of aerogel and xerogel catalysts were also done by Courtheoux et al [8] and Popa et al [9]; for the catalytic propellant decomposition the aerogels showed lower activities, although they had superior properties compared with xerogels. Sault et al developed a platinum-alumina aerogel catalyst via a combination of inverse micelle technology with sol-gel processing [10]; although the aerogel exhibited higher turnover frequency for propane dehydrogenation than the xerogel, the Pt diameter and the BET surface area were much larger and smaller, respectively, for the aerogels.…”
Section: Introductionmentioning
confidence: 96%
“…Alumina preparation through a sol-gel process was performed [185], and the addition of doping elements and its consequences on the thermal stability of transition alumina were discussed [186]. The impact on thermal stability and 79 wt.% HAN-21 wt.% H 2 O decomposition catalytic activity of both drying procedures and active phase introduction (impregnation against one-step addition before sol formation) [188], xerogels and aerogels of alumina were compared. The consequences on homogeneity and thermal stability of the support were followed once heated up to 1200 • C for 5 h, leading to an alumina phase transition from γ -to θ-alumina [187].…”
Section: Catalytic Decomposition Of Han and And Hnfmentioning
confidence: 99%
“…Therefore, it is of vital importance to improve the thermal stability of alumina support for the catalytic decomposition of N 2 O propellant. Addition of promoters to alumina is an effective method for suppressing the surface area loss and avoiding transition to a-Al 2 O 3 induced by high-temperature reactions [5][6][7][8][9][10][11][12][13]. Beguin et al [9] reported that numerous cations, such as La 3?…”
Section: Introductionmentioning
confidence: 99%
“…, were extremely effective for retarding the sintering and phase transformation of alumina at high temperatures. Courthéoux et al [10] prepared silica-doped alumina aerogels by a sol-gel method and demonstrated a marked increase in the thermal stability after calcination at 1200°C, owing to silicon atoms stabilizing the alumina defect structure. Osaki et al [13] also found that silicadoped alumina cryogels exhibited a high thermal stability by virtue of the synergetic effects of the very low bulk density and the dopant.…”
Section: Introductionmentioning
confidence: 99%