Evidence for the synthesis of La-hexaaluminate from aluminum-containing saline slag wastes: Correction of structural defects and phase purification at low temperature

Torrez-Herrera, J.J.; Fuentes-Ordóñez, E.G.; Korili, S.A.; Gil, A.

doi:10.1016/j.powtec.2020.08.087

Cited by 16 publications

(7 citation statements)

References 55 publications

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“…Regarding the stoichiometry of the lanthanum hexa-aluminate phase, quantified areas from the STEM-EDS elemental maps showed that the indexed elongated phase contained 2.7 at% La, 35.2 at% Al, 60.1 at% O (1.2 at% Ce and 0.8 at% Zr). Although lanthanum hexa-aluminate phase is widely noted as LaAl11O18 [33,35,49,50], an ideal stoichiometric LaAl11O18 phase generally cannot be formed while nonstoichiometric compositions with an Al/La ratio in the range of 11-14 have been reported for hexaaluminate structures [51][52][53]. Our result agrees with this expected ratio.…”

Section: Microstructuresupporting

confidence: 88%

Alumina toughened zirconia reinforced with equiaxed and elongated lanthanum hexa-aluminate precipitates

Meerbeek

Tunca

et al. 2021

Journal of the European Ceramic Society

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Section: Microstructuresupporting

confidence: 88%

Alumina toughened zirconia reinforced with equiaxed and elongated lanthanum hexa-aluminate precipitates

Meerbeek

Tunca

et al. 2021

Journal of the European Ceramic Society

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“…Also, hydrothermal treatment is used with advantage as the synthesis method or as part of the synthesis method for HA precursors. 363,415,426,427 In summary, the search for a facile, reproducible and scalable synthesis method that produces HAs with small particle sizes and adequate surface areas is an ongoing task. The ultimate goal is to optimize and expand the applicability of HAs, not the least in the field of catalysis.…”

Section: Synthesis Methods Formentioning

confidence: 99%

“…Optionally, the alumina gel is first aged in the organic solvent used for the reaction. Also, hydrothermal treatment is used with advantage as the synthesis method or as part of the synthesis method for HA precursors. ,,, …”

Section: Lanthanum Hexaaluminate (Lha)mentioning

confidence: 99%

La-Doped Alumina, Lanthanum Aluminate, Lanthanum Hexaaluminate, and Related Compounds: A Review Covering Synthesis, Structure, and Practical Importance

Heveling

2023

Ind. Eng. Chem. Res.

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Advanced materials based on lanthanum–aluminum oxides are useful for many practical applications, not the least in catalysis, energy conversion and energy storage systems designed for a sustainable world economy. The three main La–Al–O (LAO) combinations of commercial interest are La-doped aluminas (LDA), lanthanum monoaluminate (LMA, a perovskite), and lanthanum hexaaluminate (LHA). Usually, the literature treats doped aluminas, perovskites, and hexaaluminates separately. The current review tries to identify common trends and features with respect to structure, synthesis, and applications of LAOs, which should lead to a more holistic understanding of their chemistry. This, in turn, should trigger innovative ideas with respect to new or improved applications. Apart from a variety of uses at low temperatures, the main advantages of LDA, LMA, LHA, and related compounds are their high-temperature stability and the extended applicability that comes with it.

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“…In conclusion, there are still several interesting areas to be explored as regards the application of hexaaluminates as thermal barriers and oxidation resistant coatings, especially given the fact that the particular structure of hexaaluminates means that they can be designed, controlled and adapted to desired applications. The synthesis of hexaaluminates from industrial metal wastes [153] may be of relevant interest because close the cycle of new concepts in circular enconomy. The authors compares the results obtained with a commercial Rh/α-Al2O3 showing that hexaaluminate catalysts were less stable, active and selective than the commercial catalyst.…”

Section: Future Perspectives and Conclusionmentioning

confidence: 99%

Progress in the synthesis and applications of hexaaluminate-based catalysts

2020

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The development of materials that can exhibit thermal resistance at very high temperatures, thus allowing them to be applied as catalysts and thermal insulators, amongst other possible uses, is a research subject of great interest. This is the case for hexaaluminates, a class of hexagonal aluminate compounds with a unique structure that are stable at very high temperatures up to 1600 o C and exhibit exceptional resistance to sintering and thermal shock, thus making them attractive catalysts for high-temperature applications. In this review, the structure of hexaaluminates is presented first. The most recent advances in synthetic methods (sol-gel, reverse microemulsion, hydrothermal synthesis, carbontemplating, solution combustion synthesis and freeze drying methods) are discussed subsequently, with the aim of maximizing textural properties and including in their structure metals known to be active in catalytic applications, such as combustion of CH4, partial oxidation and dry reforming of CH4 to produce synthetic gas, and the decomposition of N2O.Finally, other applications, such as their function as a thermal barrier, are also addressed.

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Evidence for the synthesis of La-hexaaluminate from aluminum-containing saline slag wastes: Correction of structural defects and phase purification at low temperature

Cited by 16 publications

References 55 publications

Alumina toughened zirconia reinforced with equiaxed and elongated lanthanum hexa-aluminate precipitates

Alumina toughened zirconia reinforced with equiaxed and elongated lanthanum hexa-aluminate precipitates

La-Doped Alumina, Lanthanum Aluminate, Lanthanum Hexaaluminate, and Related Compounds: A Review Covering Synthesis, Structure, and Practical Importance

Progress in the synthesis and applications of hexaaluminate-based catalysts

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