Synthesis of mesoporous alumina with tunable structural properties

Wu, Wei; Wan, Zhijian; Chen, Wan; Zhu, Mingming; Zhang, Dongke

doi:10.1016/j.micromeso.2015.06.002

Cited by 66 publications

(38 citation statements)

References 24 publications

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“…according to the IUPAC classification [29], indicating their uniform mesopore structures. The wellformed H1 hysteresis loop is regarded as associating with the capillary condensation in large pore channels with probable channel adjustment [21,30]. At same time, we also detect a very obvious shift of the capillary condensation steps towards smaller relative pressures except MA-0, indicating a substantial reduce in the pore size of MA.…”

Section: Adsorbent Characterizationsupporting

confidence: 58%

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Controllable synthesis of mesoporous alumina with large surface area for high and fast fluoride removal

Liu

Dong

et al. 2016

Ceramics International

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Section: Adsorbent Characterizationsupporting

confidence: 58%

“…For example, Wu et al [21]. synthesized the MA with tunable structural properties via hydrolysis of aluminium isopropoxide associated with non-ionic block copolymer P123 as the structure-directing template.…”

Section: Introductionmentioning

confidence: 99%

Controllable synthesis of mesoporous alumina with large surface area for high and fast fluoride removal

Liu

Dong

et al. 2016

Ceramics International

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“…The TG‐DTA curve of the non‐treated or original aluminium glycerate nanospheres (s‐Al 0 ) shows three weight loss steps, as evident in Figure a. The first weight loss step in the temperature range of 0–200 °C is due to the evaporation of both physisorbed and chemisorbed water . The second weight loss step in the temperature range of 200–400 °C is attributed to the degradation of organic compounds.…”

Section: Resultsmentioning

confidence: 99%

Template‐Free Fabrication of Mesoporous Alumina Nanospheres Using Post‐Synthesis Water‐Ethanol Treatment of Monodispersed Aluminium Glycerate Nanospheres for Molybdenum Adsorption

Saptiama

Kaneti

Suzuki

et al. 2018

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This work reports the template-free fabrication of mesoporous Al O nanospheres with greatly enhanced textural characteristics through a newly developed post-synthesis "water-ethanol" treatment of aluminium glycerate nanospheres followed by high temperature calcination. The proposed "water-ethanol" treatment is highly advantageous as the resulting mesoporous Al O nanospheres exhibit 2-4 times higher surface area (up to 251 m g ), narrower pore size distribution, and significantly lower crystallization temperature than those obtained without any post-synthesis treatment. To demonstrate the generality of the proposed strategy, a nearly identical post-synthesis "water treatment" method is successfully used to prepare mesoporous monometallic (e.g., manganese oxide (MnO )) and bimetallic oxide (e.g., CuCo O and MnCo O ) nanospheres assembled of nanosheets or nanoplates with highly enhanced textural characteristics from the corresponding monometallic and bimetallic glycerate nanospheres, respectively. When evaluated as molybdenum (Mo) adsorbents for potential use in molybdenum-99/technetium-99m ( Mo/ Tc) generators, the treated mesoporous Al O nanospheres display higher molybdenum adsorption performance than non-treated Al O nanospheres and commercial Al O , thereby suggesting the effectiveness of the proposed strategy for improving the functional performance of oxide materials. It is expected that the proposed method can be utilized to prepare other mesoporous metal oxides with enhanced textural characteristics and functional performance.

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“…However, there is no unique method to accomplish sol‐gel process and to do so, different approaches have been introduced in literatures. In a typical method of synthesis, an aluminum salt, usually aluminum nitrate, would be used as precursor to improve the overall acidity, surface area, and porosity, and an alkaline such as ammonia would also be included as the precipitating agents. In another method, structure directing agents (i. e. the templates with which the morphology of materials would be engineered) would be embedded to form desired structure and be subsequently removed through solvent exchange or calcination processes ,,,,,.…”

Section: Introductionmentioning

confidence: 99%

“…[14] In this process, due to the presence of poisoning chemicals such as sulfur and heavy metals, ranging from a few to hundreds of nanometers in size, [15] catalyst supports of mesoporous and macroporous structures would be required to promote and carry out the hydrotreating reactions efficiently. Depending on its application, γ-alumina has been investigated in terms of surface area, [16][17][18] porous structure, [19][20][21] or both, [9,[22][23][24][25][26] and different mechanisms and processes have been introduced to manipulate such morphological properties. [27] It has been shown that the morphology of the meso/macroporous γalumina (MGA) strongly depends on the procedures used to be synthesized.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Meso/Macroporous γ‐Alumina via Aluminum Pellet with Controllable Porosity: Ammonium Bicarbonate Influences through Drying and Calcination Steps

et al. 2019

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Mesoporous and macroporous γ‐alumina have been synthesized using the economic source of aluminum pellets. To manipulate the porosity and overall porous characteristics, ammonium bicarbonate was incorporated into the gel and studied to determine its influence on the porous structure of the obtained γ‐alumina. The nanostructure of the synthesized γ‐alumina, characterized by the N2 sorption isotherms and FESEM analysis, indicated that the γ‐alumina of desired pore size distribution could be achieved using such economical source of aluminum when ammonium bicarbonate was considered to tailor its porous structure. The formation of macropores in synthesized γ‐alumina was confirmed by the FESEM images and the crystalline structure of the γ‐alumina of optimal porous structure was revealed via X‐ray diffraction pattern. Before and after being calcinated at 500 °C, TG‐DTA and FT‐IR analyses were also conducted to better assess the impact that thermal processes could have on ultimate γ‐alumina porous characteristics. Considering the embedded ammonium bicarbonate expander, a two‐step mechanism was finally proposed to explain the observed porosity developed through heating stages. Different porosity patterns developed through drying and calcination steps were then contributed to the reactions taking place at each, and N2 sorption isotherms, as well as the FESEM images, were used to evaluate the introduced pore forming mechanisms.

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Synthesis of mesoporous alumina with tunable structural properties

Cited by 66 publications

References 24 publications

Controllable synthesis of mesoporous alumina with large surface area for high and fast fluoride removal

Controllable synthesis of mesoporous alumina with large surface area for high and fast fluoride removal

Template‐Free Fabrication of Mesoporous Alumina Nanospheres Using Post‐Synthesis Water‐Ethanol Treatment of Monodispersed Aluminium Glycerate Nanospheres for Molybdenum Adsorption

Synthesis of Meso/Macroporous γ‐Alumina via Aluminum Pellet with Controllable Porosity: Ammonium Bicarbonate Influences through Drying and Calcination Steps

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