The application of
bismuth oxide in catalysts mainly has three categories: one is molybdenum-bismuth catalyst, such as bismuth-molybdenum-titanium mixed oxide prepared by sol-gel method, with a specific surface area of 32-67m2/g, which is a kind of oxidation reaction Effective and economical catalytic material, in industrial applications, it can be used as a catalyst for the oxidation of propylene to acrolein, the preparation of acrylonitrile from propylene, the preparation of butadiene by oxidative dehydrogenation of butene, and the oxidation of butadiene to furan; the second category is The yttrium bismuth catalyst, a bismuth oxide material doped with yttrium oxide, is a very attractive catalyst for the oxidative coupling reaction of methane to ethane or ethylene. Such as BY25, bismuth oxide doped with 25% yttrium oxide, bismuth is currently used in methane oxidation coupling reaction better catalyst (such as LiMgO) is 15 times more efficient, and can be recycled as many as 18 times; the third category is the burning rate Catalyst, bismuth oxide is gradually replacing lead oxide as an important catalyst in solid propellants. Because lead oxide is poisonous, it has direct or indirect harm to the staff and the environment. In addition, due to the smoke generated in the engine exhaust, it is not good for guidance, and bismuth oxide is an ecologically safe material with low toxicity and less smoke. The former Soviet Union has successfully applied bismuth oxide instead of lead oxide as a burning rate catalyst. At present, the role of nano-bismuth oxide in improving the burning rate of propellants and reducing the pressure index is being studied.
As an advanced powder material, bismuth oxide is not only used in electronic ceramic powder materials, electrolyte materials, photoelectric materials, high-temperature superconducting materials, catalysts, etc., but also in other aspects, such as nuclear waste absorption materials, picture tube shadow mask coating Layers, non-toxic fireworks and other aspects have good application prospects. With the continuous deepening of research on the application of bismuth oxide and the continuous strengthening of people's awareness of environmental protection, the application of bismuth oxide will be more extensive.
