Influence of hydrolysis method on the sol-gel formation of the yttria-alumina system with use of alcoholates

Grinberg, E. E.; Baranova, G. V.; Strel’nikova, I. E.

doi:10.1134/s1070427213010035

Cited by 1 publication

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“…This synthesis route is inspired by a bimetallic sol-gel synthesis of yttria-alumina [176], which uses an aluminum alkoxide and yttrium salts. We transferred this approach to the synthesis of pure alumina, also employing an aluminum salt along with the alkoxide.…”

Section: Mutual Cross-hydrolysis In Combined Sol-gel Synthesismentioning

confidence: 99%

“…The route employed for the mutual cross-hydrolysis has been briefly reported as a means to synthesize yttria-alumina [176]. While several other publications also report syntheses starting from these two types of precursors, at least one of the two is peptized or hydrolyzed prior to combining both precursors [163,164,[182][183][184][185][186].…”

Section: Mutual Cross-hydrolysis In Combined Sol-gel Synthesismentioning

confidence: 99%

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Towards Macroporous α-Al2O3—Routes, Possibilities and Limitations

2020

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This article combines a systematic literature review on the fabrication of macroporous α-Al2O3 with increased specific surface area with recent results from our group. Publications claiming the fabrication of α-Al2O3 with high specific surface areas (HSSA) are comprehensively assessed and critically reviewed. An account of all major routes towards HSSA α-Al2O3 is given, including hydrothermal methods, pore protection approaches, dopants, anodically oxidized alumina membranes, and sol-gel syntheses. Furthermore, limitations of these routes are disclosed, as thermodynamic calculations suggest that γ-Al2O3 may be the more stable alumina modification for ABET > 175 m2/g. In fact, the highest specific surface area unobjectionably reported to date for α-Al2O3 amounts to 16–24 m2/g and was attained via a sol-gel process. In a second part, we report on some of our own results, including a novel sol-gel synthesis, designated as mutual cross-hydrolysis. Besides, the Mn-assisted α-transition appears to be a promising approach for some alumina materials, whereas pore protection by carbon filling kinetically inhibits the formation of α-Al2O3 seeds. These experimental results are substantiated by attempts to theoretically calculate and predict the specific surface areas of both porous materials and nanopowders.

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Section: Mutual Cross-hydrolysis In Combined Sol-gel Synthesismentioning

confidence: 99%