The properties of nickel aluminate nanoparticles prepared by sol–gel and impregnation methods

Nickel aluminates were prepared by sol–gel and impregnation methods and calcined at 1100 °C. The sol–gel made samples were prepared with different amounts of nickel (Ni/Al molar ratio equal to 0, 0.25, 0.5, and 0.75) and aging times (24 and 48 h). The samples were characterized by X-ray diffraction,...

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Bibliographic Details
Published in:Research on chemical intermediates 2016-12, Vol.42 (12), p.7909-7921
Main Authors: Komeili, Samane, Taeb, Abbas, Takht Ravanchi, Maryam, Rahimi Fard, Maryam
Format: Article
Language:English
Subjects:
Aluminates
Ammonia
Catalysis
Chemistry
Chemistry and Materials Science
Inorganic Chemistry
Nanoparticles
Nickel
Physical Chemistry
Sol-gel processes
Specific surface
Surface area
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Summary:Nickel aluminates were prepared by sol–gel and impregnation methods and calcined at 1100 °C. The sol–gel made samples were prepared with different amounts of nickel (Ni/Al molar ratio equal to 0, 0.25, 0.5, and 0.75) and aging times (24 and 48 h). The samples were characterized by X-ray diffraction, induced couple plasma, nitrogen physisorption, transmission and scanning electron microscopy, and ammonia temperature programmed desorption (NH 3 -TPD). In the sol–gel made samples, only the NiAl 2 O 4 structure of nickel aluminate was defined, while for impregnation, NiAl 10 O 16 was formed as well. The sol–gel made samples had low specific surface areas (7.7–12.4 m 2 /g), but a sample prepared by impregnation method had higher specific surface area (67.2 m 2 /g). The surface acidity density decreased by increasing the amount of nickel and was the lowest for impregnation method.
ISSN:0922-6168
1568-5675
DOI:10.1007/s11164-016-2568-x