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Pt涂層蜂窩金屬和Ce改性Fe2O3催化CO的性能對比

Analysis of CO catalytic oxidation by Pt-loading catalyst and Ce-doped Fe2O3

  • 摘要: 鐵礦石燒結煙氣中含有較高濃度的CO(體積分數0.5%~2%),因此對其進行CO脫除意義重大。為了探究不同類型催化劑的催化效果,采用浸漬法制備了Pt涂層蜂窩金屬催化劑和鐵鈰氧化物催化劑,并通過X射線熒光光譜分析(XRF)對其組分含量進行了分析。二者在模擬燒結煙氣中進行CO脫除性能的對比實驗,活性測試表明,不同CO初始體積分數、煙氣溫度以及水汽含量對CO催化氧化的脫除效率影響較大。當模擬煙氣中不含水汽的時候,二者在180 ℃及更高溫度下對CO的脫除效率均能達到60%以上。反應溫度為180 ℃,水汽體積分數為11.7%時,Pt負載型催化劑中的CO轉化率為63.9%,而該條件下Ce改性Fe2O3催化劑的CO轉化率僅為34.9%。當溫度在180~300 ℃范圍內,Pt負載型催化劑具有較好的抗水性,且繼續升高溫度,水汽體積分數增加對催化劑效率的負面影響更顯著。如水汽體積分數從0增加到27.1%時,與180 ℃時的催化效率相比,Pt負載型催化劑在240 ℃時的催化效率由73.9%降至62.3%,降幅遠遠增大。另外,對這兩種催化劑進行了抗硫性測試。當水汽體積分數為0時,Ce改性Fe2O3催化劑抗硫性更佳,但當SO2和水汽同時存在的情況下,Pt負載型催化劑具有更好的抗硫性。因此,在實際燒結中建議采取高效的脫硫措施并布置脫水層以減少其對于催化劑的負面影響。

     

    Abstract: The iron ore sintering flue gas contains a relatively high CO concentration (volume fraction of 0.5%?2%); therefore, it is of great significance to remove CO. To study the catalytic effect of different catalysts, typical Pt-supported catalyst and Ce-doped Fe2O3 catalyst were prepared by impregnation, and their components were analyzed by X-ray fluorescence. The activity results show that different initial CO concentrations, flue gas temperature, and water vapor volume fraction have a great influence on the removal efficiency of CO catalytic oxidation. When there is no water vapor in the flue gas, the CO removal efficiency of the two catalysts is over 60%. When the reaction temperature is 180 ℃ and the water vapor volume fraction is 11.7%, the CO conversion efficiency of the Pt-supported catalyst is 63.9%, but the CO conversion efficiency of the Ce-doped Fe2O3 catalyst is only about 34.9%. Furthermore, the results show that the Pt-supported catalyst has a better water resistance in the range of 180?300 ℃. If the reaction temperature is higher, the increase in water vapor volume will have a more negative impact on the catalytic efficiency of both catalysts. For example, when the volume fraction of water vapor increases from 0 to 27.1%, the catalytic efficiency of the Pt-supported catalyst drops from 73.9% to 62.3%, which decreases much more compared to the case of 180 ℃. In addition, the sulfur resistance of the two catalysts was also tested. The Ce-doped Fe2O3 catalyst is more resistant to SO2, when there is no water vapor. However, when SO2 and water vapor exist at the same time, the Pt-supported catalyst has better sulfur resistance. Therefore, during the actual sintering process, it is recommended to adopt efficient desulfurization measures and arrange the water absorption layer in order to reduce the negative impacts on catalysts.

     

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