Synthesis and characterization of nanocrystallite MgAl<inf>2</inf>O<inf>4</inf> spinels as catalysts support

J. Salmones, J. A. Galicia, J. A. Wang, M. A. Valenzuela, G. Aguilar-Rios

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Abstract

MgAl2O4 spinels for use as Pt-Sn catalysts support for propane dehydrogenation were prepared by traditional coprecipitation techniques with nitrate salts as precursors and ammonia or ammonium carbonate as precipitating agent. Increasing pH from 10-12 decreases pore diameters but increases the surface areas of the samples when ammonium carbonate is the coprecipitation agent. A more basic media results in compositions close to that of stoichiometric spinel. In the coprecipitating samples, the crystalline size of the cubic crystals is uniformly distributed in the range from 7 to 14 nm. With wet mixing, however, both needle-shape and cubic crystals 10 to 100 nm appeared, indicating that it is necessary to produce spinels at higher calcination temperature.
Original languageAmerican English
Pages (from-to)1033-1037
Number of pages929
JournalJournal of Materials Science Letters
DOIs
StatePublished - 1 Jan 2000
Externally publishedYes

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