Thermal and Hydrothermal Stability of Al-Pillared Rectorites

Abstract:

Al-pillared rectorites (Al-REC) were synthesized from naturally occurring rectorite through exchange of interlamellar ions with hydroxyalumina polycations. Furthermore, Powder X-ray diffraction (XRD), Nitrogen adsorption-desorption isotherms, and Transmitting electronic microscopy (TEM) were applied in order to study the themal stability and hydrothermal stability of pillared materials. The Al-REC are thermally stable up to 800 °C. X-ray diffractograms of Al-REC calcined at 800 °C show a sharp and intense d001 peak, corresponding to a basal spacing of 2.75nm. In a 100% steam flow under atmospheric pressure at 800 °C for 20h, the characteristic d001 spacing of Al-REC decreases from 2.74 to 2.52nm, the sharp and intense d001 peak is still observed. And micropore area, mesopore volume and micropore volume retain 62, 33 and 67%, respectively, which affirms that this pillared clay has exceptional hydrothermal stability.

• Periodical: Advanced Materials Research (Volume 178)
• Pages: 314-317
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.178.314
• Online since: December 2010
• Authors: Hong Yan Xu, Xing Tong Chen, Ai Hong Guo
• Keywords: Rectorite, Thermal Stability, X-Ray Diffraction (XRD)

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