Effect of precipitating agent on the performance of Co3O4-catalyzed decomposition of N2O
The Co3O4 composite metal oxides were prepared by the hydrothermal method using cobalt acetate as the cobalt source.The physicochemical properties of the catalysts were characterized by XRD,FTIR,TEM,SEM,BET,H2-TPR,O2-TPD and XPS.The catalyst catalytic decomposition activity of N2O was evaluated in a fixed-bed microreactor,and the effect of precipitants(NaOH、Na2CO3、NaHCO3、H2NCONH2、CH8N2O3、NH3·H2O)on the catalytic decomposition performance of N2O was investigated.The results showed that the Co3O4 catalysts prepared by the hydrothermal method were all of spinel structure,and different precipitating agents affected the catalyst morphology,redox performance and catalytic decomposition N2O activity.The activity of the catalysts prepared with sodium precipitant was higher than that of other catalysts because it promoted the reduction process of Co3+to Co2+,influenced the chemical environment of cobalt ions,improved the electron donating capability,weakened the Co—O bond in the catalyst,and accelerated the regeneration of oxygen vacancies during the catalytic reaction.The Co3O4-NaOH catalyst,which contained a small amount of Na ions,had a strong redox ability,a large Oads/Olatt ratio,resulting in a large amount of oxygen adsorbed on the surface,and a low N2O decomposition temperature.Under the conditions of the reaction gas composition of 0.88％O2,0.65％N2O,and N2 as equilibrium gas(flow rate of 80mL/min),T10 and T95 were 330℃ and 470℃,respectively.
国家科技期刊平台
NSTL
万方数据
