THERMAL STABILITY OF [B] ZSM-5 MOLECULAR SIEVE

HONG SB; UH YS; WOO SI; LEE JK

Korean Journal of Chemical Engineering, Vol.8, No.1, 1-5, January, 1991

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.

[References]

Chu CTW, Kuehl GH, Lago RM, Chang CD, J. Catal., 93, 451 (1985)
Gabelica Z, Nagy JB, Bodart P, Debras G, Chem. Lett., 1059 (1984)
Scholle KFMGJ, Veeman WS, Zeolites, 5, 118 (1985)
Brunner E, Freude D, Hunger M, Pfeifer H, Reschetilowski W, Unger B, Chem. Phys. Lett., 148, 226 (1988)
Meyers BL, Ely SR, Kutz NA, Kaduk JA, Bossche EVD, J. Catal., 91, 352 (1985)
Taramasso M, Perego G, Notari B, "Proceedings of the 5th International Zeolite Conference," L.V.C. Rees, ed., Heyden, London, p. 40 (1980)
Howden MG, Zeolites, 5, 334 (1985)
Woo SI, Lee JK, Hong SB, Park YK, Uh YS, Stud. Surf. Sci. Catal., 49, 1095 (1989)
Argauer RJ, Landolt GR, U.S. Patent, 3,702,886, Assigned to Mobil Oil Corporation (1972)
Beyer HK, Borbely G, "Proceedings of the 7th International Zeolite Conference," Y. Murakami, A. Iijima and J.W. Ward, eds., Elsevier, New York, 867 (1986)
Powder Diffraction File No. 11-695, compiled by JCPOS, U.S.A. (1983)
Scherer GW, Sc. D. Thesis, MIT (1974)
Powder Diffraction File No. 6-297, 634, 24-160 and 31-210, compiled by JCPOS, U.S.A. (1983)
Deil WJ, Bray PJ, Xiao SZ, J. Non-Cryst. Solids, references cited therein, 58, 1 (1983)
Wagner CD, Riggs WM, Davis LE, Moulder JF, Muilenberg GE, "Handbook of X-ray Photoelectron Spectroscopy," Perkin-Elmer Corp., New York, 36 (1979)

[Referenced By]

[1] Chu CTW, Kuehl GH, Lago RM, Chang CD, J. Catal., 93, 451 (1985)

[2] Gabelica Z, Nagy JB, Bodart P, Debras G, Chem. Lett., 1059 (1984)

[3] Scholle KFMGJ, Veeman WS, Zeolites, 5, 118 (1985)

[4] Brunner E, Freude D, Hunger M, Pfeifer H, Reschetilowski W, Unger B, Chem. Phys. Lett., 148, 226 (1988)

[5] Meyers BL, Ely SR, Kutz NA, Kaduk JA, Bossche EVD, J. Catal., 91, 352 (1985)

[6] Taramasso M, Perego G, Notari B, "Proceedings of the 5th International Zeolite Conference," L.V.C. Rees, ed., Heyden, London, p. 40 (1980)

[7] Howden MG, Zeolites, 5, 334 (1985)

[8] Woo SI, Lee JK, Hong SB, Park YK, Uh YS, Stud. Surf. Sci. Catal., 49, 1095 (1989)

[9] Argauer RJ, Landolt GR, U.S. Patent, 3,702,886, Assigned to Mobil Oil Corporation (1972)

[10] Beyer HK, Borbely G, "Proceedings of the 7th International Zeolite Conference," Y. Murakami, A. Iijima and J.W. Ward, eds., Elsevier, New York, 867 (1986)

[11] Powder Diffraction File No. 11-695, compiled by JCPOS, U.S.A. (1983)

[12] Scherer GW, Sc. D. Thesis, MIT (1974)

[13] Powder Diffraction File No. 6-297, 634, 24-160 and 31-210, compiled by JCPOS, U.S.A. (1983)

[14] Deil WJ, Bray PJ, Xiao SZ, J. Non-Cryst. Solids, references cited therein, 58, 1 (1983)

[15] Wagner CD, Riggs WM, Davis LE, Moulder JF, Muilenberg GE, "Handbook of X-ray Photoelectron Spectroscopy," Perkin-Elmer Corp., New York, 36 (1979)