Síntese e caracterização de peneiras moleculares do tipo SAPO-34 e MeAPSO-34

Abstract

Samples of SAPO-34 and MeAPSO-34 were prepared by two different procedures taken from literature, with small modifications. For MeAPSO-34 synthesis (Me/Al = 0,025 e 0,0075) Ni, Mn, Fe and Co nitrate were used. The NiAPSO-34 were obtained in two different Ni concentration (Ni/Al ratio of 0,025 and 0,0075). The synthesized samples were characterized by X-ray diffraction, infrared spectroscopy, scanning electron microscopy and temperature programmed dessoption of ammonium. From X-ray diffraction, it was confirmed that samples presenting CHA type structure were obtained. These structure type are characteristical of SAPO-34 and MeAPSO-34 samples. From temperature programmed dessorption of ammonium, it was observed that metal incorporation to SAPO structure results in samples presenting higher acid site density. The total acidity was also function of silica concentration of the sample. Strong acid sites were formed for silica rich samples.