Sol-Gel Method on the Preparation of Boron-doped Activated Alumina

In this paper, the crystal phase, pore structure, and surface properties of boron doping γ-alumina were investigated systematically, by the sol-gel method. The influence of the chemical environment and the modification mechanism of aluminium was explored in boron doping alumina. The samples were characterized by using XRD, N 2 adsorption at low temperature, NH 3 -TPD, TEM, and NMR. The X-ray diffraction peaks of boria-alumina have no obvious change with the increasing content of boron, which still gives priority to the characteristic diffraction peaks of γ-Al 2 O 3 . Both the specific surface area of boria-alumina and pore volume diameter increase. The result of NMR indicates that boron alters the chemical environment of aluminium, then causes the difference in physical and chemical properties on the surface.