CHARACTERIZATION OF MICROPOROSITY IN STABLE ORDERED MESOPOROUS ALUMINOSILICATES ASSEMBLED FROM PREFORMED NANOSIZED ZEOLITE PRECURSORS

摘要

Microporosity of stable ordered mesoporous aluminosilicates such as MAS-7 and MAS-9 assemblied from zeolite nanoclusters is characterized by transmission electron microscopy (TEM), N_2 isotherms, and catalytic reactions with various probing molecules. TEM images of MAS-7 and MAS-9 show obvious white dots assigned to micropores except for the ordered mesopores. N_2 isotherms show that MAS-7 and MAS-9 have much larger microporous volume than SBA-15. Catalytic reactions of probing molecules including isopropanol dehydration, cumene and 1,3,5-triisopropylbenzene cracking (TIPB) show that the microporous size of Al-SBA-15, MAS-9, and MAS-7 is at 3.4-5.0, 5.0-7.4, and 7.4-8.7 A, respectively.