The Effect of TO4 Tetrahedral Electric Charge in Molecular Sieves

Abstract

Abstract: Based on the results of the gas-solid reactions between AlCl₃(PCl₃) and APO-5 molecular sieve, we have investigated the electric and energetic factors in the isomorphous substitution reactions of the aluminosilicate zeolites and aluminophosphate molecular sieves. By comparison of the applications of Loewenstein's rule and Pauling's electrostatic valence rule to molecular sieves, we can conclude that the nature of Loewenstein's rule is electrostatic and limited, however, might it restated as linkages of two TO₄ tetrahedra with the same kind of charge (positive or negative) in molecular sieve framework are not present. The quantum chemical calculation verifies the validity of the above conclusion.

Key words: APO-5, Molecular sieve, Loewenstein's rule, Quantum-chemical calculation

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Hou Jun, Guo Chunxiao, Xu Ruren . The Effect of TO₄ Tetrahedral Electric Charge in Molecular Sieves[J]. Chem. J. Chinese Universities, 1988, 9(12): 1257.

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The Effect of TO₄ Tetrahedral Electric Charge in Molecular Sieves

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