Preparation Of Co3O₄ Nanocatalyst And Its Application In Low Temperature Oxidation Of CO

With the development of society,environmental problems have become more and more prominent.As one of the main pollutants in the atmosphere,how to effectively eliminate CO has received widespread attention.Catalytic oxidation is considered to be an efficient method for eliminating CO.How to develop a highly efficient catalyst for CO oxidation is particularly important.Co3O4 has a high catalytic CO oxidation performance and is considered to be the most promising catalyst for replacing precious metals.The specific work of this paper is as follows:In the first part,the Co3O4 nanorod catalyst was synthesized by co-precipitation method.After the introduction of Sn O2 in situ,the stability and activity of the catalyst were greatly improved.Among them,the 5Sn Co catalyst shows the best activity,and its catalytic activity is much higher than some literature values.In the low temperature reaction,the 5Sn Co catalyst can achieve complete conversion of CO at-100 °C,which provides a low temperature for CO oxidation elimination.By pre-treatment before the reaction,the catalyst can be completely converted within 800 min at room temperature of 30°C,while the pure Co3O4 can only be maintained for 140 min,which indicates that the introduction of Sn greatly improves the reactive oxygen species on its surface.By continuously introducing active oxygen species during the reaction process,complete conversion of CO at room temperature can reach more than 100 h,which provides a good solution for eliminating CO at industrial room temperature.The second part of the work is to synthesize six different morphologies of catalysts.From the kinetic point of view,it is proposed that the six morphologies of Co3O4 catalysts are basically consistent when catalyzing CO oxidation.It is for the first time find that Co3O4 nanowire has better catalytic activity than other morphologies and is more active than supported precious metals.This has more practical applications for eliminating automobile exhaust and purifying air pollution.The third part of the work is to design the Co3O4 nanowire @dopamine nanocatalyst to impove catalyst stability in moisture atmosphere.The relationship between catalytic activity and stability can be concluded that the Co3O4 catalyst has a certain decrease in catalytic activity due to mass transfer after coating with dopamine.Due to the hydrophobic action of polymer layer dopamine,Co3O4 can reach more than 100 h stability in a 5% water vapor atmosphere.