TY - JOUR
T1 - Understanding of the high hydrothermal stability of the mesoporous materials prepared by the assembly of triblock copolymer with preformed zeolite precursors in acidic media
AU - Han, Yu
AU - Li, Nan
AU - Zhao, Lan
AU - Li, Defeng
AU - Xu, Xianzhu
AU - Wu, Shuo
AU - Di, Yan
AU - Li, Caijin
AU - Zou, Yongcun
AU - Yu, Yi
AU - Xiao, Feng Shou
N1 - Generated from Scopus record by KAUST IRTS on 2023-09-21
PY - 2003/8/7
Y1 - 2003/8/7
N2 - Mesoporous pure silica (MPS-9) is prepared using an assembly of preformed Silicalite-I nanoclusters with a triblock copolymer surfactant. The results of X-ray diffraction, transmission electron microscopy, and N2 adsorption show that MPS-9 has a mesostructure that is similar to that of other mesoporous materials prepared from preformed zeolite nanoclusters, such as mesoporous aluminum silicates (MAS-7, MAS-9) and titanium silicate (MTS-9). However, MPS-9 shows weaker hydrothermal stability, in comparison to those other mesoporous materials prepared from preformed zeolite nanoclusters. On the other hand, three Al-SBA-15 samples synthesized from various routes are all much more hydrothermally stable than pure silica SBA-15. The previously proposed factors, including thicker pore walls, a disordered structure, the "salt effect", and zeolite-like connectivity, have been proven to be indeed favorable for the improvement of hydrothermal stability in this study. However, the introduction of heteroatoms (Al or Ti) in mesoporous materials is another favorable factor and can enhance the hydrothermal stability to a greater extent.
AB - Mesoporous pure silica (MPS-9) is prepared using an assembly of preformed Silicalite-I nanoclusters with a triblock copolymer surfactant. The results of X-ray diffraction, transmission electron microscopy, and N2 adsorption show that MPS-9 has a mesostructure that is similar to that of other mesoporous materials prepared from preformed zeolite nanoclusters, such as mesoporous aluminum silicates (MAS-7, MAS-9) and titanium silicate (MTS-9). However, MPS-9 shows weaker hydrothermal stability, in comparison to those other mesoporous materials prepared from preformed zeolite nanoclusters. On the other hand, three Al-SBA-15 samples synthesized from various routes are all much more hydrothermally stable than pure silica SBA-15. The previously proposed factors, including thicker pore walls, a disordered structure, the "salt effect", and zeolite-like connectivity, have been proven to be indeed favorable for the improvement of hydrothermal stability in this study. However, the introduction of heteroatoms (Al or Ti) in mesoporous materials is another favorable factor and can enhance the hydrothermal stability to a greater extent.
UR - https://pubs.acs.org/doi/10.1021/jp026899j
UR - http://www.scopus.com/inward/record.url?scp=0042734514&partnerID=8YFLogxK
U2 - 10.1021/jp026899j
DO - 10.1021/jp026899j
M3 - Article
SN - 1520-6106
VL - 107
SP - 7551
EP - 7556
JO - Journal of Physical Chemistry B
JF - Journal of Physical Chemistry B
IS - 31
ER -