Nghiên cứu ảnh hưởng của nhiệt độ nung, tỷ lệ mol Ce-Ti-Si đến sự hình thành pha oxit hỗn hợp CeO2-TiO2-SiO2 được tổng hợp bằng phương pháp đốt cháy gel polyvinyl ancol

Abstract

The nanosized CeO₂-TiO₂-SiO₂ mixed oxide  powder has been synthesized by the gel combustion method using polyvinyl alcohol (PVA) as polymer basic and mixture of cerium (IV) nitrate, titanium (III) chloride and silane. Effects of preparative parameters on the phase formation of CeO₂-TiO₂-SiO₂ such as Ce-Ti-Si molar ratio, calcination temperature have been investigated and discussed. The results showed that, for the optimized procedure with pH = 1, temperature of gel formation of 80 ^oC, molar ratio of metal over polyvinyl alcohol of 1/3, molar ratio of Ce-Ti-Si of     1-1-8. The CeO₂-TiO₂-SiO₂ mixed oxides were obtained with the averge grain size of nanopowders up to 97 nm after calcined at 850 ^oC for 2 hours.

Keywords: CeO₂-TiO₂-SiO₂ mixed oxides, cerium(IV) nitrate, titanium (III) chloride, silane, polyvinyl alcohol, combustion method.