Book: Zeolites: Science and Technology December 16th, 2009
PREFACE
Zeolites have been the focus of intensive activity and growth in applications over the past 25 years in ion exchange, in adsorption and in catalytic process technology. Beginning with the synthetic zeolites A,X and Y, continuing into the emerging ZSM series, and including selected natural zeolites, applications span the range from large-scale purification and separation to such major petroleum and petrochemical processes as catalytic cracking and aromatics alkylation. more…
Zeolite: The Versatile Mineral September 8th, 2009
Zeolite is a naturally occurring mineral group consisting of over 50 different minerals. Made of a special crystalline structure that is porous but remains rigid in the presence of water, zeolites can be adapted for a variety of uses.
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Database of Zeolite Structures August 13th, 2009
The database of the Structure Commission of the International Zeolite Association provides structural information on all zeolite structure types. This includes crystallographic data and drawings for all zeolite framework types, simulated powder patterns for representative materials and relevant references.
-Descriptions and drawings of each framework type
-User-controlled animated displays of each framework type
-Crystallographic data and simulated powder diffraction patterns for representative materials
-Relevant references
-Detailed instructions for building models
-Descriptions of some families of disordered zeolite structures
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Zeolites August 13th, 2009
Natural zeolites form where volcanic rocks and ash layers react with alkaline groundwater. Zeolites also crystallized in post-depositional environments over periods ranging from thousands to millions of years in shallow marine basins. Naturally occurring zeolites are rarely pure and are contaminated to varying degrees by other minerals, metals, quartz or other zeolites. For this reason, naturally occurring zeolites are excluded from many important commercial applications where uniformity and purity are essential.
Natural zeolites form where volcanic rocks and ash layers react with alkaline groundwater. Zeolites also crystallize in post-depositional environments over periods ranging from thousands to millions of years in shallow marine basins. Naturally occurring zeolites are rarely pure and are contaminated to varying degrees by other minerals, metals, quartz, or other zeolites. For this reason, naturally occurring zeolites are excluded from many important commercial applications where uniformity and purity are essential.
Study: Zeolites in Ethylene Removal August 13th, 2009
Zeolite impregnated films, paper liners, and packing foam blocks are being sold or are in commercial development to market to the horticulture industry. Among the benefits promoted is the removal of ethylene from the airspace surrounding and external to packed commodities. We have evaluated several zeolite-based products or prototypes being targeted to the floriculture industry for the protection of ethylene-sensitive potted plants and cutflowers during short-term storage, transportation and distribution.
Conclusion: Potassium permanganate-based product, Ethylene Control, could be shown to remove ethylene from the enclosed air space.
