Synthesis, characterization and formation mechanism of hexagonal prism polycrystalline γ-Al2O3

LIU Dong-mei; MA Bo; YANG Wei-ya; LING Feng-xiang; SHEN Zhi-qi; WANG Shao-jun; SUN Wan-fu; ZHAO Xiao-xue

Volume 41 Issue 10

Oct. 2013

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Article Navigation > Journal of Fuel Chemistry and Technology > 2013 > 41(10): 1262-1267

LIU Dong-mei, MA Bo, YANG Wei-ya, LING Feng-xiang, SHEN Zhi-qi, WANG Shao-jun, SUN Wan-fu, ZHAO Xiao-xue. Synthesis, characterization and formation mechanism of hexagonal prism polycrystalline γ-Al2O3[J]. Journal of Fuel Chemistry and Technology, 2013, 41(10): 1262-1267.

Citation:

LIU Dong-mei, MA Bo, YANG Wei-ya, LING Feng-xiang, SHEN Zhi-qi, WANG Shao-jun, SUN Wan-fu, ZHAO Xiao-xue. Synthesis, characterization and formation mechanism of hexagonal prism polycrystalline γ-Al₂O₃[J]. Journal of Fuel Chemistry and Technology, 2013, 41(10): 1262-1267.

Citation:

LIU Dong-mei, MA Bo, YANG Wei-ya, LING Feng-xiang, SHEN Zhi-qi, WANG Shao-jun, SUN Wan-fu, ZHAO Xiao-xue. Synthesis, characterization and formation mechanism of hexagonal prism polycrystalline γ-Al₂O₃[J]. Journal of Fuel Chemistry and Technology, 2013, 41(10): 1262-1267.

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Synthesis, characterization and formation mechanism of hexagonal prism polycrystalline γ-Al₂O₃

1.
College of Chemistry, Chemical Engineering and Environmental Engineering, Liaoning University of Petroleum & Chemical Technology, Fushun 113001, China;
2.
Fushun Research Institute of Petroleum and Petrochemicals, SINOPEC, Fushun 113001, China;
3.
Research Institute of China Petroleum Fushun Petrochemical Co, Fushun 113004, China

Received Date: 2013-04-11
Rev Recd Date: 2013-06-23
Publish Date: 2013-10-30

Abstract

Abstract

Novel hexagonal prism polycrystalline γ-Al₂O₃ particles were hydrothermally synthesized in ammonia medium by using AlCl₃·6H₂O as aluminum precursor. The γ-Al₂O₃ particles were characterized by means of XRD, SEM, TEM and nitrogen sorption measurements and the formation mechanism of crystal morphology was investigated. The results indicated that after the hydrothermal treatment of aluminum precursor in ammonia medium as well as the later calcination process, γ-Al₂O₃ particles with perfect hexagonal prism shape can be obtained; the border size and length of the hexagonal prism are about 0.3 and 2.5 μm, respectively. TEM images show that the hexagonal prism γ-Al₂O₃ particles are aggregated with fine particles of about 10 nm and then take the polycrystalline gamma phase. Such a γ-Al₂O₃ material exhibits a BET area of 274 cm²/g and pore volume of 0.51 cm³/g with a narrow pore size distribution centered at 5.5 nm. The results also suggest that the formation of the hexagonal prism γ-Al₂O₃ particles is closely related to the arrangement of the steady AlOOH precursors interacted with NH⁺₄ ions.
- alumina,
- hexagonal prism,
- polycrystalline,
- morphology

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