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Thermogravimetric Study of Template Remotion of Niobium Aluminophosphate

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Abstract

Niobium-aluminophosphate materials with AEL structure (NbALPO-11) were synthesized by the hydrothermal method at 170°C for a period of 72 h. The chemical composition of the gel was: DIPA:Al2O3:(1–x)P2O5:xNb2O5:80H2O, where x=0.025, 0.050 and 0.100(DIPA=di-isopropylamine template). The obtained materials were characterized by X-ray fluorescence, X-ray diffraction, infrared spectroscopy, scanning electron microscopy and thermogravimetry. From TG, was observed that the remotion of the template occluded in the porous of the NbALPO-11 materials, occurred in two steps, the first in the temperature range from 180 to 260°C, due to physically adsorbed DIPA molecules, and the second step, from300 to 410°C, attributed to the DIPA decomposition to propene and ammonia.

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Authors and Affiliations

  1. Department of Chemistry, Federal University of Rio Grande do Norte, CP 1662, 59078-970, Natal-RN, Brazil

    A. O. S. Silva, V. J. Fernandes Jr. & A. S. Araujo

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  1. A. O. S. Silva
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  2. V. J. Fernandes Jr.
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  3. A. S. Araujo
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Silva, A.O.S., Fernandes, V.J. & Araujo, A.S. Thermogravimetric Study of Template Remotion of Niobium Aluminophosphate. Journal of Thermal Analysis and Calorimetry 64, 1147–1152 (2001). https://doi.org/10.1023/A:1011588812387

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