Polyethylene Glycol-Assisted Synthesis of High Specific Surface Area and Pore Volume γ-Al2O3 Using Sol-Gel Method

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KAZEMI HOSSEIN; SHAHHOSSEINI SHAHROKH; BAZYARI AMIN

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Journal: Nashrieh Shimi va Mohandesi Shimi Iran Year:2020 | Volume:39 | Issue:2 (96) Page(s): 89-97

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Title

Polyethylene Glycol-Assisted Synthesis of High Specific Surface Area and Pore Volume γ-Al2O3 Using Sol-Gel Method

Author(s)

KAZEMI HOSSEIN | SHAHHOSSEINI SHAHROKH | BAZYARI AMIN | Issue Writer Certificate

Keywords

Sol-gelQ1

γ-aluminaQ1

Polyethylene glycolQ1

Specific surface areaQ2

Pore volumeQ1

Abstract

In this study, the effects of Polyethylene glycol on the structural properties of gamma-alumina (γ-Al2O3) synthesized via a modified Sol-gel process was investigated. To this end, Polyethylene glycol (PEG) and aluminum isopropoxide (Al(OPri)) were used as the structure-directing agent and aluminum precursor, respectively. Nitrogen adsorption-desorption analysis was performed to obtain the Specific surface area, pore-volume, and pore size distributions of the γ-Al2O3 samples synthesized with different mole ratios of PEG/Al(OPri). The maximum Specific surface area (344 m2/g) and the Pore volume (2. 2 cm3/g) was obtained for the γ-Al2O3 prepared with a PEG/Al(OPri) mole ratio of 0. 05. These surface area and Pore volumes were about 40 and 340% higher than the sample synthesized in the absence of PEG. It was also observed that increasing the mole ratio of PEG/Al(OPri) to more than 0. 05 had no significant effect on the structure of γ-Al2O3. The best sample was further studied by Scanning Electron Microscopy (SEM) and X-Ray Diffraction (XRD) analyses and the results were compared with the commercial γ-Al2O3 prepared from Merck Company with a Specific surface area and Pore volume of 174 m2/g and 0. 5 cm3/g, respectively. XRD analysis showed that the crystallite sizes of the best-synthesized sample and Merck product were 7 and 13 nm, respectively. Unlike previous γ-Al2O3 synthesis methods, in which synthetic samples with a high Specific surface area typically had a small Pore volume, the use of PEG in the Sol-gel process could significantly increase both the Specific surface area and the Pore volume. Furthermore, PEG-assisted synthesis of γ-Al2O3 was less complex than the other methods.

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APA: Copy

KAZEMI, HOSSEIN, SHAHHOSSEINI, SHAHROKH, & BAZYARI, AMIN. (2020). Polyethylene Glycol-Assisted Synthesis of High Specific Surface Area and Pore Volume γ-Al2O3 Using Sol-Gel Method. NASHRIEH SHIMI VA MOHANDESI SHIMI IRAN (PERSIAN), 39(2 (96) ), 89-97. SID. https://sid.ir/paper/410780/en

Vancouver: Copy

KAZEMI HOSSEIN, SHAHHOSSEINI SHAHROKH, BAZYARI AMIN. Polyethylene Glycol-Assisted Synthesis of High Specific Surface Area and Pore Volume γ-Al2O3 Using Sol-Gel Method. NASHRIEH SHIMI VA MOHANDESI SHIMI IRAN (PERSIAN)[Internet]. 2020;39(2 (96) ):89-97. Available from: https://sid.ir/paper/410780/en

IEEE: Copy

HOSSEIN KAZEMI, SHAHROKH SHAHHOSSEINI, and AMIN BAZYARI, “Polyethylene Glycol-Assisted Synthesis of High Specific Surface Area and Pore Volume γ-Al2O3 Using Sol-Gel Method,” NASHRIEH SHIMI VA MOHANDESI SHIMI IRAN (PERSIAN), vol. 39, no. 2 (96) , pp. 89–97, 2020, [Online]. Available: https://sid.ir/paper/410780/en

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