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Investigation of the Structural Characterization of Mesoporous Molecular Sieves MCM‐41 from Sepiolite
Author(s) -
Jin Shengming,
Qiu Guanzhou,
Xiao Fei,
Chang Yan,
Wan Cuifeng,
Yang Min
Publication year - 2007
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2007.01513.x
Subject(s) - mesoporous material , sepiolite , mcm 41 , high resolution transmission electron microscopy , molecular sieve , fourier transform infrared spectroscopy , materials science , crystallization , chemical engineering , hydrothermal circulation , amorphous solid , mineralogy , transmission electron microscopy , crystallography , chemistry , nanotechnology , organic chemistry , adsorption , raw material , catalysis , engineering
Mesoporous molecular sieves, MCM‐41, were synthesized from sepiolite using acid leaching, followed by hydrothermal reconstruction and then calcinations at 540°C for 5 h. The structures and the porosity of MCM‐41 were investigated by means of small‐angle X‐ray diffraction patterns, Brunaer‐Emmett‐Teller (BET), 29 Si MAS NMR, Fourier transform infrared (FTIR), and high resolution transmission electron microscope (HRTEM) methods. The results showed that the hexagonal MCM‐41 was formed in an alkaline solution of pH 12, when crystallization was carried out at 100°C for 24 h. The specific surface area, pore diameter, and pore volumes of MCM‐41 from sepiolite were 1036 m 2 /g, 2.98 nm, and 1.06 cm 3 /g, respectively. 29 Si MAS NMR results revealed that amorphous silica decomposed into Si–O chains consisting of two layers of Si atoms, with Q 3 configurations resulting in an increase in the fraction of Q 3 configuration during the crystallization of post‐Mg‐extraction sepiolite. The IR results illustrated that the complex of ≡≡SiO − –CTA + was formed during the synthesis of MCM‐41 from post‐Mg‐extraction sepiolite.