Influência das razões molares SiO2/Al2O3 e Me/Al2O3 sobre as propriedades de peneiras moleculares tipo SAPO-34 e MeAPSO-34

Abstract

The molecular SAPO-34 was synthesized by hydrothermal crystallization method using 4 different values for the molar ratio SiO2/Al2O3 at 3 different reaction times (24h, 48h and 120). The molecular MeAPSO-34 was synthesized by hydrothermal crystallization method using two different metals, niquel and cobalt, using 5 molar ratio Me/Al2O3 different (0.0; 0.01; 0.02; 0.03 and 0.04 ). All samples of SAPO-34 and MeAPSO-34 obtained were characterized by X-ray diffraction, nitrogen adsorption, ammonia temperature programmed desorption and scanning electron microscopy. The analysis of X-ray diffraction confirmed the achievement of the CHA structure type in all cases. By nitrogen adsorption specific area were obtained, and values of specific micropore volume compatible with the expected structure (CHA). It was also observed that the acidity of the samples strongly depends on its chemical composition.