Efficient synergistic catalytic oxidation of NO by nano Co-Ce catalysts and low-temperature plasma
The synergistic catalytic oxidation of NO by nano catalysts and low-temperature plasma(NTP)has received widespread attention in the removal of nitrogen oxides from flue gas.Nano Co-Ce catalysts(Co-CeOx)were synthesized by the hydrothermal method,and their synergistic catalytic efficiency with dielectric barrier discharge(DBD)for NO oxidation was investigated.The sulfur and water resistance properties of the catalysts were also investigated.The results indicate that the synergistic effect of nano Co-CeOx catalysts and DBD can achieve efficient oxidation of NO,with NO2 as the main catalytic product.When the voltage is 19 kV to 23 kV,the conversion rate of NO can reach 100%.When the voltage is above 23 kV,the NO conversion rate decreases as the voltage increases.In addition,with the introduction of SO2(400×10-6,volume fraction),the catalysts exhibit excellent sulfur resistance property.When H2O(5%,volume fraction)is introduced,the water resistance property of the catalysts is relatively weak.The characterization results of the catalyst indicate that there is no significant change in the crystal structure of the catalysts before and after the reaction,indicating that the catalysts have good stability.The synergistic effect between Co and Ce in the catalysts results in a higher surface active oxygen and oxygen migration rate.Finally,based on experimental phenomena and spectral characterization,the reaction pathway of synergistic efficient catalytic oxidation of NO by Co-CeOx catalysts and low-temperature plasma was inferred.
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