Abstract
The thermal stability of [BJZSM-5 (boronsilicalite) has been examined by IR, XRD,11B MAS NMR and XPS techniques. [B]ZSM-5 and amorphous borosilicate were converted to α-cristobalite at high temperatures (=750C). However, Na-free amorphous borosilicate was not converted to a-cristobalite at 750C. Therefore, the presence of Na ions in [BJZSM-5 would determine whether this transition occurred or not. When the phase transition to α-cristobalite occurred, most of B atoms tetrahedrally coordinated were released from the ZSM-5 structure and migrated to the exterior surface as a boron compound having trigonal BO3 units and oxidation states of 3.
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Hong, S.B., Uh, Y.S., Woo, S.I. et al. Thermal stability of [B]ZSM-5 molecular sieve. Korean J. Chem. Eng. 8, 1–5 (1991). https://doi.org/10.1007/BF02697690
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DOI: https://doi.org/10.1007/BF02697690