Preparation and characterization of high surface area Al[sub 2]O[sub 3]-MgAl[sub 2]O[sub 4]

Journal Article · Fri Jul 01 00:00:00 EDT 1994 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1006/jcat.1994.1223· OSTI ID:6764872

Otero Arean, C; Mas Carbonell, C; Turner Palomino, G ^[1]; Parra Soto, J B ^[2]

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1. Universidad de las Islas Baleares, Palma de Mallorca (Spain)
2. Instituto Nacional del Carbon, Oviedo (Spain)

Mixed metal oxides with spinel-type structure are often used as model systems for catalytic studies, and some of them find current industrial usage. Magnesium aluminate, MgAl[sub 2]O[sub 4], acts as an efficient transfer catalyst for reducing sulfur dioxide emissions, and it can also be used as a convenient support for metal carbonyls and other catalyst precursor materials. For these applications, high surface area and accessible porosity are desirable properties. The classical method to prepare MgAl[sub 2]O[sub 4] involves high-temperature solid state reaction between MgO and Al[sub 2]O[sub 3], but severe sintering leads to very low surface areas. Suitable precursors have been sought to obtain a high surface area spinel. They include coprecipitated hydroxides or oxalates and [gamma]-alumina impregnated with a magnesium nitrate solution. Reported surface areas of MgAl[sub 2]O[sub 4] samples obtained from these precursors, after mild calcination at about 800 K, are in the 50-120 m[sup 2]g[sup [minus]1] range. The authors describe here the preparation and characterization of MgAl[sub 2]O[sub 4], and also Al[sub 2]O[sub 3]-MgAl[sub 2]O[sub 4] solid solutions, with surface areas of 250-300 m[sup 2]g[sup [minus]1]. Interest in the solid solutions stems from the fact that gradual changes of chemical composition provide a means to modulate surface acidity. 17 refs., 3 figs., 1 tab.

• OSTI ID: 6764872
• Journal Information: Journal of Catalysis; (United States), Vol. 148:1; ISSN 0021-9517
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINATES
SPECIFIC SURFACE AREA
ALUMINIUM OXIDES
MAGNESIUM COMPOUNDS
CATALYSTS
CHEMICAL PREPARATION
SOLID SOLUTIONS
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
CHALCOGENIDES
DISPERSIONS
MIXTURES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SOLUTIONS
SYNTHESIS
360606* - Other Materials- Physical Properties- (1992-)