Synthesis and stability of CoMCM-41 mesoporous molecular sieve using cetyltrimethyl ammonium bromide as a template by two-step hydrothermal method

摘要

CoMCM-41 mesoporous molecular sieves were synthesized by two-step hydrothermal method using sodium silicate and cobalt chloride as raw materials and cetyltrimethyl ammonium bromide as a template. The as synthesized samples were characterized by means of X-ray diffraction (XRD), transmission electron microscopy (TEM), specific surface area analysis, Fourier transform-infrared spectroscopy (FT-IR) and N, physical adsorption. The experimental results show that the as synthesized CoMCM-41 mesoporous molecular sieve has a specific surface area over 700 m(2)/g and an average pore size in a range of 3.4-4.5 nm. After the template was effectively removed by calcination at 550 degrees C, the pore structure was not damaged. On the other hand, specific surface area, pore size and pore volume of the as synthesized CoMCM-41 mesoporous molecular sieves were not markedly changed after hydrothermal treatment at 100 degrees C for 5 days or thermal treatment at 650 degrees C for 3 h. The synthesized CoMCM-41 mesoporous molecular sieve has good thermal and hydrothermal stability. The stability of the as synthesized CoMCM-41 mesoporous molecular sieve is related to the different sequence of adding raw material. (C) 2007 Elsevier B.V. All rights reserved.