CHARACTERIZATION OF SYNTHETIC NA-BEIDELLITE

被引：60

作者：

KLOPROGGE, JT ^{[1
]}

JANSEN, JBH ^{[1
]}

GEUS, JW ^{[1
]}

机构：

[1] STATE UNIV UTRECHT,DEPT INORGAN CHEM,ANALYT CHEM LAB,3522 AD UTRECHT,NETHERLANDS

来源：

CLAYS AND CLAY MINERALS | 1990年 / 38卷 / 04期

关键词：

D O I：

10.1346/CCMN.1990.0380410

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Na-beidellite, a member of the smectite group, was grown hydrothermally from a gel of composition 0.35 Na2O.2.35Al2O3.7.3SiO2 in NaOH solutions at a pH between 7.5 and 13.5, a pressure of 1 kbar, and a temperature of 350°C. The synthetic Na-beidellite was characterized by a variety of means. The unit-cell parameters of the orthorhombic cell are: a = 5.18, b = 8.96, and c = 12.54 Å. The cation-exchange capacity was determined to be 70 meq/100 g. A maximum of 40 wt.% water was present and reversibly lost by heating to about 55°C. The loss of water caused a decrease of the basal spacing to 9.98 Å. At temperatures ≥600°C, the Na-beidellite started to dehydroxylate, reaching its maximum in the range 600°-630°C. At 1100°C the remaining solid recrystallized to Al6Si2O13 (mullite) and SiO2 (cristobalite). -from Authors

引用

页码：409 / 414

页数：6

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