By Tadashi Hattori
This quantity includes the lawsuits of the foreign Symposium on Zeolites and Microporous Crystals (ZMPC '93). At this assembly growth within the following components was once mentioned: crystal chemistry; synthesis; ion alternate and amendment; adsorption and diffusion; intercalation and crosslinking; hostguest interplay; catalysis; applications
summary: This quantity contains the court cases of the foreign Symposium on Zeolites and Microporous Crystals (ZMPC '93). At this assembly development within the following parts was once mentioned: crystal chemistry; synthesis; ion alternate and amendment; adsorption and diffusion; intercalation and crosslinking; hostguest interplay; catalysis; functions
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Extra info for Zeolites and Microporous Crystals, Proceedings of the International Symposium on Zeolites and Microporous Crystals
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L. 0 Young ACKNOWLEDGEMENTS We acknowledge Texaco Inc. and Department of Energy, Office of Basic Energy Science, Division of Chemical Sciences for support of this research. REFERENCES 1. -L. O’Young, in M. L. Occelli and H. E. Robson (Ed), Synthesis of Microporous Materials, Vol. 333. 2. R. N. -F. Shen, E. J. Neth, S . L. -L. O’Young, S . Levine, and J. M. Newsarn, to be published. 3. R. Giovanili and B. Balmer, Chimia, 35 (1981) 53. 4. -F. Shen, R. P. Zeger, S . L. Suib, L. McCurdy, D. I. -L.
Characterization Methods The XRD powder patterns of OMS-2, pyrolusite, and nsutite are distinct enough to identify their tunnel structures. The XRD powder patterns of OMS-1 are similar to those of layered precursors, birnessite and buserite, they all have a d-spacing around 10 A. TEM and adsorption of OMS-1 were studied to further confirm the (3x3) structure. TGA, BET, and ESR were used to study the thermal stability of OMS. RESULTS AND DISCUSSION A. Classification of Molecular Sieves (MS) Based on the basic structural unit, molecular sieves can be classified as tetrahedral molecular sieves (TMS), octahedral molecular sieves, and mixed molecular sieves (Figure 2).
The second mechanism involves layered manganese oxides, birnessite and buserite, at high pH’s as the intermediates. OMS-1 and OMS-2 are then formed by controlling temperature and counter ion. Scheme 1. Two Proposed Synthetic Mechanisms of OMS Mechanism I Mn(2+) Solution + 1- Mn04(-) Solution or Other Oxidsnti 1 Low pH ’ Amorphous Mmterlair Mechanism I1 HipH , Layered MItedmls T. T h e Template ’ OMS-2. Pyroluslte (1x1). & NIUtltO T. Tlme Template OMS-1 & OMS-2 It is interesting that there are many similarities between the syntheses of OMS and zeolites.