Studies on the improved thermal stability for doped ordered mesoporous γ-alumina

Sun, Qianping; Zheng, Ying; Li, Zhaohui; Zheng, Yong; Xiao, Yihong; Cai, Guojun; Wei, Kemei

doi:10.1039/c3cp50190f

Cited by 23 publications

(11 citation statements)

References 47 publications

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“…Lanthanum and cerium are probably the most well-known dopants that are even applied industrially to retain large γ-Al 2 O 3 specific surface areas at elevated temperatures [12,[149][150][151][152][153][154][155][156][157][158][159]. The doping atoms are incorporated into the alumina structure and generate structures with aluminum ions in tetrahedral symmetry, hence stabilizing the γ-Al 2 O 3 spinel structure and shifting its phase transition to higher temperatures [155,160].…”

Section: Dopants Favoring or Inhibiting α-Transitionmentioning

confidence: 99%

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: Dopants Favoring or Inhibiting α-Transitionmentioning

confidence: 99%

Towards Macroporous α-Al2O3—Routes, Possibilities and Limitations

2020

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“…Therefore, it is considered that aniline is an interfacial protective agent for forming mesoporous alumina. [29][30][31] So aniline was chosen as interface protective agent to prepare the mesoporous alumina with large surface area. The synthetic M-g-Al 2 O 3 promise its potential application in the eld of modied electrode.…”

Section: Characterization Of M-g-al 2 Omentioning

confidence: 99%

Highly sensitive determination of lead(ii) and cadmium(ii) by a large surface area mesoporous alumina modified carbon paste electrode

Zheng

Chen

et al. 2018

RSC Adv.

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“…Therefore, alumina-ceria composites are very important from application point of view since the properties of the individual components get modified in each other's presence. As of today, only the synthesis of 2D hexagonal mesoporous alumina-ceria powder has been documented [19,22,23]. The basic advantages of films over powders, and the importance of cubic mesopores led to the current progress in the field of ordered mesoporous materials fabricated as thin films [24][25][26].…”

Section: Introductionmentioning

confidence: 99%