Improvement of hydrothermal stability of mesoporous silica using salts: reinvestigation for time-dependent effects

Research was conducted to reexamine the salt effect to solve the problem of poor reproducibility. The synthesis of mesoporous silica molecular sieves was obtained in the presence of salts under different experimental conditions. A hydrothermal stability test in boiling water, X-ray diffraction, infrared spectroscopy and scanning electron microscopy were used to analyze the hydrothermal stability and structure of the silica materials. It was found that the time dependence was a very important factor for the improvement of the hydrothermal stability.