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Ion Exchange in Molten Salts. II: The Occlusion of Lithium, Sodium, Potassium and Silver Nitrates in the Respective Forms of Zeolite A.
Author(s) -
Liquornik M.,
Marcus Y.
Publication year - 1968
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1002/ijch.196800017
Subject(s) - chemistry , anhydrous , lithium nitrate , zeolite , potassium , lithium (medication) , sodium , inorganic chemistry , potassium nitrate , ion , silver nitrate , nuclear chemistry , ionic bonding , organic chemistry , catalysis , medicine , endocrinology
The occlusion of lithium, sodium, potassium and silver nitrates from the anhydrous melts in the respective zeolites has been studied by measuring the gain in weight and by direct analysis. The results in moles of occluded nitrate per formula weight of zeolite M 12 I [(AlO 2 ) 12 (SiO 2 ) 12 ] are 11.7 for LiNO 3 , 10 for NaNO 3 and 10 for AgNO 3 and essentially zero for KNO 3 . A model is proposed for the structure of the occlusion compound Na 22 [(AlO 2 ) 12 (SiO 2 ) 12 (NO 3 ) 10 ], in terms of four Na I + ions and four [Na I ‐ NO 3 ‐ Na] + groups at the apexes of the cubic unit cell and four [Na II ‐ NO 3 ‐ Na] +1/3 groups coordinated with two [NaNO 3 ] −2/3 groups at the faces, to explain the properties of the occluded zeolites.