Studies on Crystallization and Properties of Silicophosphoaluminate Molecular Sieves in Methylaminc System

Abstract

Abstract: The hydrothcnnal crystallization behaviour of CH₃NH₂-SiO₂-P₂O₅-Al₂O₃-H₂O system was investigated at 150℃ under autogenous pressure and a ternary phase diagram with the apices of the triangle representing pure CH₃NH₂, P₂O₅ and Al₂O₃ was obtained, which shows the effect of the composition changes of CH₃NH₂, P₂O₅ and Al₂O₃ on the crystalization phase when in the reaction mixture the molar ratio of SiO₂ : Al₂O₃ : H₂O=0. 4: 1 : 40. Two silicophosphoaluminate molecular sieves,CFS-APO-1 and CFSAPO-2, were found to be formed from the system. The physicochemical properties of CFSAPO-1 samples containing different amout of silicon were studied with XRD, DTA, TG,IR, NH₃-TPD and adsorption methods. It is found that the framework Pand Al were substituted congruent-ly by silicon.

Key words: Molecular sieve, Ternary phase diagram, Framework

TrendMD:

He Heyong, Pan Sizhong, Zhang Ling, Cao Yongwen, Gao Zi. Studies on Crystallization and Properties of Silicophosphoaluminate Molecular Sieves in Methylaminc System[J]. Chem. J. Chinese Universities, 1990, 11(10): 1052.

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Studies on Crystallization and Properties of Silicophosphoaluminate Molecular Sieves in Methylaminc System

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