The Synthesis and Characterization of Mesoporous Molecular Sieves MCM-41 with Interconnected Channels
Resource
Studies in Surface Science and Catalysis 129: 15-22
Journal
Nanoporous Materials II Proceedings of the 2nd Conference on Access in Nanoporous Materials(Studies in Surface Science and Catalysis)
Pages
15-22
Date Issued
2000
Date
2000
Author(s)
Lin, Hong-Ping
Wong, She-Tin
Liu, Shang-Bing
Mou, Chung-Yuan
Tang, Chih-Yuan
Abstract
The mesoporous MCM-41 materials with highly connected nanochannels have been obtained from the aluminosilicate-CnTMAX-H2O systems by a delayed neutralization procedure. The N2 adsorption-desorption isotherm of the materials exhibits a large type B hysteresis at p/p0∼ 0.5. The hysteresis effect is dependent on the synthetic condition and the Si/Al ratio. In spite of the chain length of the surfactant, this hysteresis takes place around the same p/p0 value. From the TEM micrographs of the ultrathin section, one can clearly find that these mesoporous materials contain many structure defects, which are irregular shaped and the size distributes between 5.0-30.0 nm. Combining the above two evidences, we interpret the neighboring channels are interconnected through defects in channels walls. The diffusion of molecules inside these highly defective MCM-41 materials becomes more effective. We show that it leads to a better catalyst support material using ethylbenzene dehydrogenation reaction as an illustration. © 2000 Elsevier Science B.V. All rights reserved.
Type
journal article