Thermostable yttria-doped inorganic oxide catalyst supports for high temperature reactions

摘要

Temperature resistant oxide supports for catalytic active phases are necessary for the catalytic combustion of hydrocarbon pollutants in the field of environment as well for energy production through hydrocarbon clean combustion. Four commonly used pure support oxides in catalysis: silica, alumina, titania, and zirconia were synthesised by the sol-gel and aerogel methods and, in parallel, the same oxides were doped with yttria. Pure yttria aerogel was also made and characterised. Heat treatments were performed from ambient up to 1200℃ and BET surface areas and XRD patterns were recorded after heat treatments at 300, 600, 900 and 1200℃ for pure and doped oxides, respectively. Doped aerogel oxides, compared to yttria-free, exhibit increased thermal resistance in terms of specific surface areas. Most frequently the low temperature amorphous structures were preserved up to 900℃.