Recent advances and new horizons in zeolite science and by H. Chon

By H. Chon

This quantity experiences and analyzes new findings among 1986 and 1996 at the synthesis, characterization and functions of zeolite fabrics, in addition to predicting new learn and layout instructions for the following decade.

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However, other workers found that the N 2 adsorptiondesorption isotherm of Ti-HMS is reversible [143,147]. The pore distribution was broader for HMS as compared to MCM-41 materials. The Ti-MSU-1 material also exhibited only the 100 diffraction peak due to the occurrence of disordered, hexagonal-like packing channels [72]. These samples displayed reversible N 2 adsorption-desorption isotherms with no hysteresis. Several authors used diffuse reflectance UV-Visible spectroscopy to probe the local environment of Ti sites [136-138,140,141,143,147].

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X phases. As in the case of lamellar MCM-50 [ 198], the authors prepared a stable salt-gel by reacting the surfactant niobotungstate salt with TEOS. During this treatment Nb-O-Si linkages were formed. Removal of the cationic surfactant by acidextraction resulted in porous structures with surface areas up to 265 mE/g. , Antonelli and Ying [ 199] prepared the first stable mesoporous transition metal oxide, TiO 2, using a modified sol-gel method. They showed that the key step to obtain a desired phase is to control the hydrolysis rate of the organometallic precursor, titanium tris-isopropoxide.

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