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- W2353018169 abstract "The zeolite L synthesised on Kaolin microspheres was modified to reduce its K2O content and to improve its Si/Al ratio.The optimizing experiments were employed by changing the quantity of ammonium sulfate,the reaction time and temperature in ion-exchange.The influence of the different calcination methods on Si/Al ratio and crystallinity of zeolite L was investigated,at the same time, tests were carried on to increase the Si/Al ratio of zeolite L by means of ionexchange,citric acid treatment combined with hydrothermal calcination.The optimum conditions in ion-exchange reaction were obtained as follows: reactant ratio:1g zeolite-L:10 mL water:1g ammonium sulfate;reaction temperature: 80℃;reaction time: 2h.The Si/Al ratio could be elevated effectively by calcination after ion-exchange reaction,but the crystallinity was decreased,meanwhile,temperature programmed calcination was of no effect for the crystallinity.The Si/Al ratio of zeolite L was dramatically enhanced and reached 13.6 by combined use of ion-exchange,critric acid treatment and hydrothermal treatment while the good crystallinity was held at 82%,when the concentration of citric acid was 0.10 mol/L and the zeolite was treated three times by ion exchange,citric acid dealuminzation,and hydrothermal calcination with EDTA." @default.
- W2353018169 created "2016-06-24" @default.
- W2353018169 creator A5036083161 @default.
- W2353018169 date "2009-01-01" @default.
- W2353018169 modified "2023-09-26" @default.
- W2353018169 title "Modification of Zeolite L in Situ-synthesis on kaolin Microspheres" @default.
- W2353018169 hasPublicationYear "2009" @default.
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