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THERMAL STABILITY OF [B] ZSM-5 MOLECULAR SIEVE
Korean Journal of Chemical Engineering, January 1991, 8(1),
10.1007/BF02697690
10.1007/BF02697690
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Abstract
The thermal stability of [B]ZSM-5 (boronsilicate) 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(=750℃). However, Na-free amorphous borosilicate was not converted to α-cristobalite at 750℃. Therefore, the presence of Na+ ions in [B]ZSM-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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Taramasso M, Perego G, Notari B, "Proceedings of the 5th International Zeolite Conference," L.V.C. Rees, ed., Heyden, London, p. 40 (1980)
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