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- W2023376477 abstract "ZSM-5 zeolites with SiAl ratios of 23, 72 and >400 were synthesized in the laboratory as Na+ and cation (H+, Co2+, Cu2+, Fe2+ and Zn2+)-exchanged forms and were examined by nitrogen and argon porosimetry. Na-ZSM-5 of any SiAl ratio and high-alumina ZSM-5 (SiAl=23) zeolites of any exchanged cation display single transition adsorption isotherms (type I isotherm) for both nitrogen and argon. However, other cation-exchanged ZSM-5 zeolites of lower alumina contents display step-like isotherms, i.e. two transitions in adsorption, and the second transition occurs between a relative pressure (PPo) of 0.15 and 0.2 for nitrogen and between 1·10−3 and 2·10−3 for argon. Calculated micropore size distributions based on argon adsorption show that the Na+ form or high-alumina ZSM-5 samples have a single pore of 0.55 nm as expected, while the other ZSM-5 samples which have a second transition of adsorption display the excepted pore size of 0.55 nm but also an apparent larger pore at 0.77 nm, a non-physical result. The calculated pore size of 0.55 nm for all the ZSM-5 represents its true micropore structure. Variations in the SiAl ratio and exchanged cations have no effect on this calculated value." @default.
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- W2023376477 date "1995-01-01" @default.
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- W2023376477 title "High-resolution nitrogen and argon adsorption on ZSM-5 zeolites: effects of cation exchange and ratio" @default.
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- W2023376477 doi "https://doi.org/10.1016/0927-6513(94)00064-3" @default.
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