Phase transition of mesoporous SiO2 impregnated with an organic templating agent by post-synthetic microwave heating
Tóm tắt
Mesoporous silica SBA-15 samples were subjected to microwave heating for 10–40 min at 393 and 443 K after dry-impregnation with TPAOH (tetrapropylammonium hydroxide) to prepare a mesoporous material with zeolytically ordered pore walls. Physicochemical properties of the materials prepared were characterized by XRD, N2 adsorption at 77 K, SEM, TEM, UV–vis and FT-IR spectroscopies. These investigations revealed that selective transformation of amorphous pore walls of SBA-15 to crystalline zeolytic phase is difficult to be achieved and a mixed phase of mesoporous silica/zeolite composite material was obtained, instead. Microwave heating time, temperature, TPAOH concentration, and hydrothermal stability of the mesoporous host materials tested (MCM-41, HMS, and SBA-15) were important factors to maintain the mesopore structure of the host materials during the post-synthetic microwave heating treatment.
Tài liệu tham khảo
J.S. Beck, J.C. Vartuli, W.J. Roth, M.E. Leonowicz, C.T. Kresge, K.D. Schmitt, C.T-W. Chu, D.H. Olson, E.W. Sheppard, S.B. McCullen, J.B. Higgins, J.L. Schlenker, J. Am. Chem. Soc. 114, 10834 (1992)
U. Ciesla, F. Schuth, Microporous Mesoporous Mater. 27, 131 (1999)
F.S. Xiao, Y. Han, Y. Yu, X. Meng, M. Yang, S. Wu, J. Am. Chem. Soc. 124, 888 (2002)
Y. Liu, W. Zhang, T.J. Pinnavaia, Angew. Chem. Int. Ed. Engl. 40, 1255 (2001)
C.S. Carr, S. Kaskel, D.F. Shantz, Chem. Mater. 16, 3139 (2004)
M.J. Verhoer, P.J. Kooyman, J.C. Van der Waal, M.S. Rigutto, J.A. Peters, H. van Bekkum, Chem. Mater. 13, 683 (2001)
D. Trong On, Ph. Reinert, L. Bonneviot, S. Kaliaguine, Stud. Surf. Sci. Catal. 135, 135 (2001)
K.K. Kang, W.S. Ahn, H.K. Rhee, Stud. Surf. Sci. Catal. 154, 497 (2004)
S. Jun, S.H. Joo, R. Ryoo, M. Kruk, M. Jaroniec, Z. Liu, T. Ohsuna, O. Terasaki, J. Am. Chem. Soc. 122, 10712 (2001)
K.K. Kang, C.B. Byun, W.S. Ahn, Stud. Surf. Sci. Catal. 129, 335 (2000)
N.G. Kim, G.J. Kim, W.S. Ahn, React. Kinet. Catal. Lett. 71, 273 (2000)
W. Zhang, M. Froba, J. Wang, P.T. Tanev, J. Wong, T.J. Pinnavaia, J. Am. Chem. Soc. 118, 9164 (1996)
G. Gabriel, S. Gabriel, E.H. Grant, B.S.J. Halstead, D.M.P. Mingos, Chem. Soc. Rev. 27, 213 (1998)
S.L. Suib, CATTECH 3, 75 (1998)
B.J. Schoeman, K. Higberg, J. Sterte, Nanostruct. Mater. 12, 49 (1999)
M.A. Mantegazza, G. Petrini, G. Spano, R. Bagatin, F. Rivetti, J. Mol. Catal. A 146, 223 (1999)
S. Bordiga, S. Coluccia, C. Lamberti, L. Marchese, A. Zecchina, F. Boscherini, F. Buffa, F. Genoni, G. Leofanti, G. Petrini, G. Vlaic, J. Phys. Chem. 98, 4125 (1994)
J.S. Reddy, A. Dicko, A. Sayari in Synthesis of porous materials: zeolite , clays and nanostructures, ed. by M.L. Occelli, H. Kessler (Marcel Dekker, New York, 1996), p 405
M.G. Clerici, P. Ingallina, J. Catal. 140, 71 (1993)