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- W2078487059 abstract "Some decationized forms of type A zeolite have been studied. The stability of these solids has been measured in terms of the type of thermal pretreatment (under vacuum or in hydrolyzing conditions). Water washing of the NaA forms leads to some decationization and to the appearance of nonacidic OH groups associated with ir bands at 3710 cm−1. These forms are stable up to 800 °C. By thermal treatment under vacuum between 220 and 350 °C, NH4A zeolite undergoes structural modifications associated with the appearance of ir bands at 3710, 3670 and 3620 cm−1. The acidic character of the band at 3620 cm−1 has been demonstrated by ammonia adsorption. These extensively decationized samples are reactive in catalyzing the isomerization of 1-butene into cis- and trans-2-butene, when they are pretreated below 500 °C. Beyond 500 °C gradual breakdown of the lattice diminishes these properties. The NH4A forms prepared under hydrolyzing conditions do not acquire ultrastability although ir bands are observed at 3600 and 3700 cm−1." @default.
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- W2078487059 date "1975-07-01" @default.
- W2078487059 modified "2023-10-14" @default.
- W2078487059 title "Study of the decationization of type A zeolite" @default.
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- W2078487059 doi "https://doi.org/10.1016/0021-9517(75)90275-4" @default.
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