Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 293, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.micromeso.2019.109675
Keywords
Pure Si-Beta zeolite; Steam-assisted conversion; Micro-zone synchronous crystallization; Hierarchically
Categories
Funding
- Natural Science Foundation of China [21571036]
- National Engineering Research Center of Chemical Fertilizer Catalyst
Ask authors/readers for more resources
A hierarchical nanosized pure Si-Beta zeolite was firstly prepared via a micro-zone synchronous crystallization method by steam-assisted conversion taking inorganic silicon sources as raw material. Neither zeolite seeds nor fluoride mineralizing agent was required, only a bit of organic template agent (TEAOH/SiO2 = 0.05) was sufficient for constructing a self-sustaining plate-like nanosized aggregation with high surface area (631.09 m(2)/g) and pore volume (0.7 cm(3)/g) after 24 h period, much less than reported (TEAOH/SiO2 >= 0.54, 7-21 d). The pure Si-Beta zeolite also had a superior hydrophobicity than that of hydrothermal synthesis due to the advantage of micro-zone mass transfer. All the properties of resulting samples were investigated by comprehensive characterizations, including X-ray diffraction, scanning and transmission electron microscopy, nitrogen adsorption-desorption, water adsorption, Flourier transform infrared and solid state Si-29 nuclear magnetic resonance. Importantly, a micro-zone synchronous crystallization mechanism was proposed to explain the formation of mesoporous structure and intrinsic micropores, so as to providing the theoretical guidance for one-step synthesis of hierarchical Beta and other zeolites.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available