{"title":"What is the solubility of zeolite A?","authors":"J. Šefc̆ík, A.V. McCormick","doi":"10.1016/S0927-6513(97)00007-2","DOIUrl":null,"url":null,"abstract":"<div><p>A meaningful solubility product of a zeolite should remain constant as composition of zeolite mother liquors varies at a given temperature. We identify a solubility product of zeolite A, <em>∏</em><sub>s</sub>=[Si(OH)<sub>4</sub>][Al(OH<sup>−</sup><sub>4</sub>][Na<sup>+</sup>]=1.2×10<sup>−8</sup>M<sup>3</sup>. from experimental data in highly alkaline aqueous solutions under conditions typical for zeolite A synthesis (1 M ≤ [Na] ≤ 4 M, 353 K ≤ <em>T</em> ≤ 363 K). To accomplish this we develop a thermodynamic model of dilute sodium aluminosilicate solutions representing mother liquors in equilibrium with zeolite A. Proper modeling of the liquid phase adjacent to a growing zeolite is necessary to obtain meaningful supersaturation values and solubility products. Further quantitative modeling of solution mediated zeolite growth and dissolution should include a physically relevant model of aluminosilicate speciation in the liquid phase.</p></div>","PeriodicalId":100926,"journal":{"name":"Microporous Materials","volume":"10 4","pages":"Pages 173-179"},"PeriodicalIF":0.0000,"publicationDate":"1997-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0927-6513(97)00007-2","citationCount":"13","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Microporous Materials","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0927651397000072","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 13
Abstract
A meaningful solubility product of a zeolite should remain constant as composition of zeolite mother liquors varies at a given temperature. We identify a solubility product of zeolite A, ∏s=[Si(OH)4][Al(OH−4][Na+]=1.2×10−8M3. from experimental data in highly alkaline aqueous solutions under conditions typical for zeolite A synthesis (1 M ≤ [Na] ≤ 4 M, 353 K ≤ T ≤ 363 K). To accomplish this we develop a thermodynamic model of dilute sodium aluminosilicate solutions representing mother liquors in equilibrium with zeolite A. Proper modeling of the liquid phase adjacent to a growing zeolite is necessary to obtain meaningful supersaturation values and solubility products. Further quantitative modeling of solution mediated zeolite growth and dissolution should include a physically relevant model of aluminosilicate speciation in the liquid phase.
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