Novel synthesis of high surface area MgAl2O4 spinel as catalyst support

Guo, Jianjun; Liu, Hui; Zhao, Hong; Wang, Xiaoge; Zheng, Xiaoming

doi:10.1016/j.matlet.2003.12.013

Cited by 130 publications

(43 citation statements)

References 12 publications

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“…2a, are typical of the spinel structure of magnesium aluminate 3,16,19,24,27,28 . In a recent work, Erukhimovitch et al 24 detected four main vibrations modes (γ 2 , γ 1 , γ 5 and γ 6 ) at about 523, 692, 828 and 910 cm -1 in the FTIR spectrum of stoichiometric magnesium aluminate spinel.…”

Section: Resultsmentioning

confidence: 99%

“…There are several processes to prepare nanocrystalline magnesium aluminate, such as sol-gel [13][14][15][16] , co-precipitation 17 , complexation 1,18 , mechanical milling 3 , mechanical-chemical process 19 , hydrothermal 20 , micro emulsion 21 , combustion method 15,[22][23][24][25][26] and fast pyrolysis 27 . However, many of those are complex, expensive, have several steps, require long time for synthesis, require high temperatures and produce nonhomogeneous and generally low surface area solids 28 .…”

Section: Introductionmentioning

confidence: 99%

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Effect of Urea Excess on the Properties of the MgAl2O4 Obtained by Microwave-Assisted Combustion

et al. 2017

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In this paper, magnesium aluminate spinels were prepared by microwave-assisted combustion, using urea as fuel. In order to evaluate the effect of the urea excess used in the synthesis, its mass was added in a range of 1.0 to 2.5 times the stoichiometric amount required. The materials produced were characterized by TGA, FTIR, XRF, XRD, BET, SEM and TEM. The results demonstrated that magnesium aluminate spinel was formed in all solids, but the crystallinity degree and the specific surface area increased according to the amount of urea that was used in the synthesis. The use of excess fuel in the preparation was therefore advantageous, since it eliminated the need of the calcination step, at high temperatures, in order to stabilize the spinel phase and improve the crystallinity of the solid. The heat generated in the combustion process was sufficient to develop the formation of a nanocrystalline structure and produce high purity materials, with a save of 99.4% in energy.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Urea Excess on the Properties of the MgAl2O4 Obtained by Microwave-Assisted Combustion

et al. 2017

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“…In general, there are several preparation methods of ZnAl 2 O 4 spinels, for example solid state-reaction or ceramic method [3,[6][7][8][9][10][11][12][13] or wet chemical routes such as precipitation or coprecipitation [3,6,7,[13][14][15][16][17], sol-gel [3,6,7,[18][19][20][21] and other methodologies like hydrothermal methods [5,[22][23][24][25], combustion in aqueous solution [26], molten salts synthesis [27], etc.…”

Section: Introductionmentioning

confidence: 99%

Characterization of ZnAl2O4 Obtained by Different Methods and Used as Catalytic Support of Pt

et al. 2009

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In this work the synthesis of a ZnAl 2 O 4 spinel to be used as a support of metals and its characterization were studied. The methods used for the ZnAl 2 O 4 preparation were: ceramic method (CM), mechanochemical synthesis in humid medium (HMS) and coprecipitation (COPR). ZnAl 2 O 4 CM and ZnAl 2 O 4 HMS showed negligible acidity, but the ZnAl 2 O 4 COPR displayed a low acidity. The spinels obtained by COPR and HMS showed higher specific surface area and pore volumes than that prepared by the ceramic method. In addition the catalytic performance of Pt supported on the prepared spinel was evaluated in the n-butane dehydrogenation reaction. The Pt catalysts prepared with ZnAl 2 O 4 COPR presented better activity and selectivity to olefins than the ones prepared with ZnAl 2 O 4 HMS and ZnAl 2 O 4 CM, which could be correlated with a higher metallic dispersion and lower particle sizes, detected by TEM. The acidity of ZnAl 2 O 4 COPR, observed by isopropanol dehydration and TPD of pyridine, and the sequence of specific surface areas of the different spinels (ZnAl 2 O 4 COPR [ ZnAl 2 O 4 HMS [ ZnAl 2 O 4 CM) are other important factors to define the final dispersion of the catalysts.

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“…Absorption bands centered at 1380 cm -1 are assigned to the presence of nitrate groups. Besides, broad band presented at the range of 900 cm -1~5 00 cm -1 are related to the inorganic network, and may be identified to be the existence of Al-O stretching frequency in the AlO 6 octahedral and AlO 4 tetrahedral units 20,21 . Among these, the two high-frequency bands, appeared at around 525 cm -1 and 691 cm -1 may be related to the Al-O stretching vibration in the AlO 6 octahedra, indicateing the formation of MgAl 2 O 4 spinel in all the calcined powders synthesized by using different surfactants and emulsifiers 21,22 .…”

Section: +mentioning

confidence: 95%

Thermal stability and microstructure characterization of MgAl2O4 nanoparticles synthesized by reverse microemulsion method

Lü

Lei

et al. 2013

Mat. Res.

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Magnesium aluminate (MgAl 2 O 4 ) spinel nanoparticles were synthesized by reverse microemulsion process in cyclohexane by using two kinds of surfactants, n-amyl alcohol as cosurfactant and mixture of aluminic/magnesic salt aqueous solution as basic reagents. The effects of surfactant types and titration methods on the morphologies and sizes of the MgAl 2 O 4 nanoparticles were characterized by TEM, TGA-DTA, XRD, HR-TEM and FT-IR. TEM images show that the particles prepared by forwardtitration method with SPAN-80/Triton X-100 compound emulsifier have uniform spherical shape and good monodispersity with an average size of 9.5 nm. However, the average size of the particles prepared by reverse-titration method was about 10 nm and some particles have irregular platelike appearance. The products prepared with NP-40 surfactant and forward-titration method were agglomerated with an average size of 13 nm. TGA and XRD results show that the reverse microemulsion method has dramatically lowered the calcination temperature of MgAl 2 O 4 with a degree of 700 °C, and the precursor can transform to single spinel phase at 900 °C.

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Novel synthesis of high surface area MgAl2O4 spinel as catalyst support

Cited by 130 publications

References 12 publications

Effect of Urea Excess on the Properties of the MgAl2O4 Obtained by Microwave-Assisted Combustion

Effect of Urea Excess on the Properties of the MgAl2O4 Obtained by Microwave-Assisted Combustion

Characterization of ZnAl2O4 Obtained by Different Methods and Used as Catalytic Support of Pt

Thermal stability and microstructure characterization of MgAl2O4 nanoparticles synthesized by reverse microemulsion method

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