On Zeolites
نویسندگان
چکیده
منابع مشابه
Carbocations on Zeolites . Quo Vadis ?
A natureza dos carbocátions adsorvidos na superfície da zeólita é discutida neste artigo, destacando estudos experimentais e teóricos. A adsorção de halogenetos de alquila sobre zeólitas trocadas com metais tem sido usada para estudar o equilíbrio entre alcóxidos, que são espécies covalentes, e carbocátions, que têm natureza iônica. Cálculos teóricos indicam que os carbocátions são mínimos (int...
متن کامل3rd Feza School on Zeolites
Zeolites in the strict sense are highly porous crystalline aluminosilicatesthat comprise tetrahedrally-connected three dimensional frameworks andextra-framework charge balancing cations. The frameworks containpores that are able to take in molecules of up to 1 nm in size (dependingon the structure type) and the pore geometry can include cages and/orchannels, and be one-, two...
متن کاملInteraction between Zeolites and Cluster Compounds Part 2.-Thermal Decomposition of Iron Pentacarbonyl on Zeolites
Thermal decomposition in a thermobalance of Fe(CO), adsorbed on alkali-metal, hydrogen-Y, dealuminated Y, L and omega zeolites proceeds stepwise via slow decarbonylation at low and high temperatures, separated by a fast endothermic reaction. Average CO/Fe ratios have been determined after each step. From i.r. results the former intermediates are assigned to species bearing bridging CO, whereas ...
متن کاملMesostructured zeolites: bridging the gap between zeolites and MCM-41.
Surfactant-templating is one of the most versatile and useful techniques to implement mesoporous systems into solid materials. Various strategies based on various interactions between surfactants and solid precursors have been explored to produce new structures. Zeolites are invaluable as size- and shape-selective solid acid catalysts. Nevertheless, their micropores impose limitations on the ma...
متن کاملZeolites: Large molecules welcome.
Many eff orts to improve the performance of heterogeneous catalysts and adsorbents focus on creating materials that are highly active and selective for their target reactants and products. Th is typically involves the use of porous solids with high surface areas, for instance crystalline or amorphous inorganic compounds, whose diff usional access, adsorption, and reaction properties depend stro...
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ژورنال
عنوان ژورنال: Journal of the Mineralogical Society of Japan
سال: 1964
ISSN: 1883-7018,0454-1146
DOI: 10.2465/gkk1952.7.14