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

Journal Article · Fri Jul 01 04:00:00 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), Journal Name: Journal of Catalysis; (United States) Vol. 148:1; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

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