Abstract
Solvothermal treatment is a promising process for producing well-dispersed nanocomposites, especially in metal and oxide system. Ag/gamma-alumina is a novel catalyst for decomposition of nitrogen oxide in the lean burn condition with the oxygen rich environment for diesel engine. In the present study, Ag/gamma-alumina nanocomposite was prepared by solvothermal treatment of gamma-alumina in an ethanol-water mixed medium with silver nitrate and the influence of the ratio of ethanol to water on the phase evolution of solvothermal products was investigated by using XRD, TEM, TG-DTA, XPS and BET methods. It is found that with increasing ratio of water to ethanol, more and more fiberous gamma-alumina phase changes into rhombic gamma-AlOOH, which results in the distinct influence in character of the microstructure such as BET specific surface area, pore distribution etc.
