Hong, S.B. Uh, Y.S. Woo, S.I. Lee, J.K. 2024-01-22T00:09:55Z 2024-01-22T00:09:55Z 2022-01-10 1991-01 0256-1115 https://pubs.kist.re.kr/handle/201004/146995 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. ？ 1991 Korean Institute of Chemical Engineering. English Springer-Verlag Thermal stability of [B]ZSM-5 molecular sieve Article 10.1007/BF02697690 1 Korean Journal of Chemical Engineering, v.8, no.1, pp.1 - 5 Korean Journal of Chemical Engineering 8 1 1 5 N scopus 2-s2.0-51249175106 Article