Preparation and Analysis of Transition Metal Chromium-Doped Mesoporous Silica

Abstract

Abstract Cr-doped mesoporous silicas with a two-dimensional hexagonal mesopore structure as well as with a cubic mesoporous framework have been synthesized by using 1-hexadecyl-3-methylimidazolium chloride as structure directing agent template and tetraethylorthosilicate (TEOS) and Cr (NO3)3·9H2O as precursors via hydrothermal synthesis method under alkaline conditions. The effects of the concentration of chromate on hexagonal mesophase and the reaction time on cubic mesophase were discussed in detail. The samples were characterized by X-ray diffraction andthermogravimetry (TG) techniques. The results show that the template has been completely removed when the sample is calcined at 550°C; the ordered long-range mesostructure with hexagonal and cubic phases can be obtained by adding appropriate amount of chromium salt.