Structure and synthesis of octahedral molecular sieves

Conference · Fri Dec 01 04:00:00 EST 1995

OSTI ID:126787

Shen, Yan-Fei; Suib, S L ^[1]; O`Young, C L ^[2]

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1. Univ. of Connecticut, Storrs, CT (United States)
2. Texaco Inc., Beacon, NY (United States)

Octahedral molecular sieves (OMS) represent another family of molecular sieves; they use octahedra as the basic structural unit to form three-dimensional frameworks. Unlike tetrahedral molecular sieves (TMS), e.g. zeolites, the number of known and hypothetic OMS structures are quite limited because the bond angle is rigid. A series of manganese oxide OMS with different tunnel sizes, ranging from 2.3 to 6.9 {Angstrom}, have been synthesized. Different metal ions also can be incorporated into the sieve structures by tunnel and framework substitutions. Various synthetic mechanisms are proposed based on the intermediates. There are many similarities between the syntheses of OMS and TMS; template, temperature, solvent, and pH are important synthetic parameters that control the tunnel structure of OMS. The structure and synthesis of OMS are discussed and compared with those of TMS.

• OSTI ID: 126787
• Report Number(s): CONF-950402--
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BOND ANGLE
COMPARATIVE EVALUATIONS
MANGANESE OXIDES
MOLECULAR SIEVES
MOLECULAR STRUCTURE
PH VALUE
SYNTHESIS
ZEOLITES