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• W203302852 abstract "Abstract The intracrystalline pore-cavity system in zeolites, often called the zeolitic surface, is surrounded by the zeolite crystal lattice and it is consequently strongly influenced by the zeolite crystal field. This crystal field which pervades the intracrystalline porecavity system renders zeolites solid electrolites. Depending on the ionic character of the crystal which is mainly controlled by the alumina content, zeolites show properties of weak to very strong electrolites. The adsorption properties of zeolites demonstrate strong electrostatic interaction between zeolites and occluded polar molecules. The redox chemistry of zeolites testifies that this interaction between zeolites and adsorbed species often goes beyond physical inter action, even to the extent of ionization of adsorbed atoms or molecules. Several of these ionization reactions readily proceed in zeolites at low temperatures, aided by the zeolite electrolyte. Significantly, most of these redox reactions are endothermic by one to several eV/mol when they occur in the gas phase outside the zeolite crystal. Several examples show that the electrolitic character of zeolites is displayed by both alkalication zeolites as well as by H-zeolites. Mechanistic studies of n-hexane cracking over alkali cation-zeolites show the absence of ionization of hexane or its cracked fragments. The absence of skeletal isomerization and the product composition shows that the cracking of hydrocarbons proceeds by a radical type mechanism. Thus, in spite of abundant ionization phenomena in the chemistry of alkali zeolites, they do not ionize hydrocarbons. It is worth noting that the ionization energy of hexanes and their radical fragments is > = 170 kcal/mole, significantly higher than the free energy change of several redox reactions observed in zeolites (NO + NO 2 NO + + NO 2 − , Na 0 + NaY Na 4 3+ Y, etc.). Even in the absence of ionization phenomena the cracking of hexanes over alkali zeolites shows major differences in product distribution from the non-catalysed, thermal cracking process. These differences can be explained, and the different product composition can be fully accounted for, on the asis that zeolites concentrate hydrocarbon reactants within the zeolite crystal, resulting in substantially higher reactant concentrations within the zeolite crystal relative to the surrounding gas phase. The high reactant concentration within zeolite crystals results in a strong enhancement in the rate of bimolecular reaction steps (5 to 10 fold) over uni olecular reaction steps. Specifically, in the cracking of hydrocarbons the alkali zeolite “catalyst” emphasizes the bimolecular H-transfer reactions over the unimolecular C-C bond split." @default.
• W203302852 created "2016-06-24" @default.
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• W203302852 date "1980-01-01" @default.
• W203302852 modified "2023-09-27" @default.
• W203302852 title "The Role of Electrolytic Properties of Zeolites in Catalysis" @default.
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• W203302852 doi "https://doi.org/10.1016/s0167-2991(08)64896-x" @default.
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