Effect of Mg{sup 2+} ions on the formation of todorokite type manganese oxide octahedral molecular sieves

Journal Article · Thu May 01 04:00:00 EDT 1997 · Chemistry of Materials

DOI:https://doi.org/10.1021/cm960478v· OSTI ID:569163

Tian, Zheng-Rong; Yin, Yuan-Gen; Suib, S L ^[1]

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1. Univ. of Connecticut, Storrs, CT (United States); and others

The readily available permanganate, KMnO{sub 4}, was successfully utilized in the synthesis of manganese oxide octahedral molecular sieve (OMS-1) with the todorokite type structure. The magnesium concentration in the starting materials was systematically varied to study the synthetic chemistry of Mg-OMS-1. The techniques such as powder XRD, ICP, TGA, TPD, and redox titrations were all applied to characterize the as-synthesized Mg-OMS-1 samples. The correlation between the amount of magnesium in the starting materials and the properties of Mg-OMS-1 results in differences in (1) colors, (2) crystalline purity, and (3) thermal stabilities. Magnesium(II) ions are believed to be doped into the framework of the OMS-1 structure, but the major amount of Mg{sup 2+} mainly behaves as a template and is located in the tunnels of OMS-1. Two interesting Mg{sup 2+} concentration windows have been observed, one for the starting materials and another for the Mg{sup 2+} ions in the framework of Mg-OMS-1 which cover the magnesium concentration range where good quality Mg-OMS-1 can be formed. 26 refs., 6 figs.

• OSTI ID: 569163
• Journal Information: Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 5 Vol. 9; ISSN 0897-4756; ISSN CMATEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
40 CHEMISTRY
CHEMICAL PROPERTIES
CRYSTAL DOPING
CRYSTAL STRUCTURE
DOPED MATERIALS
IMPURITIES
ION IMPLANTATION
MAGNESIUM IONS
MANGANESE OXIDES
MOLECULAR SIEVES
MOLECULAR STRUCTURE
PORE STRUCTURE
POROUS MATERIALS
STABILITY
STRUCTURAL CHEMICAL ANALYSIS
SURFACE AREA
SURFACE PROPERTIES
SYNTHESIS
VALENCE
X-RAY DIFFRACTION