Modification of micropore-containing SBA-3 by TEOS liquid phase deposition

SBA-3 with pore sizes of 22-25 angstrom has been successfully prepared by TEOS liquid phase deposition on the pristine SBA-3 with a pore size of ca. 27 angstrom. After the first TEOS modification, the resulting sample (Name: M-1/SBA-3) shows obvious changes in textural properties. As compared to SBA-3, M-1/SBA-3 has negligible micropores, its BET surface area and pore volume decrease by 24% and 40% respectively, its wall thickness increases from 15 angstrom to 22 angstrom and its pore size decreases from 27 angstrom to 23 angstrom. The presence of ethoxysilyl groups on M-1/SBA-3 is supported by FTIR and carbon content measurement, and their loading amount is estimated to be ca. 5.7 wt% by TGA. The second TEOS modification is less efficient to change the textural properties of SBA-3 owing to its lower loading (ca. 1.3 wt%). (c) 2004 Elsevier Inc. All rights reserved.