Preparation And Performances Of High-temperature Desulfurization Sorbents Of CeO_n-MnO_x/ZrO₂

In this paper, CeO_n-MnO_x / ZrO₂ sorbents for high temperature coal gas desulfurization which can be used for direct carbon solid oxide fuel cell were synthesized, characterized and tested. The CeO_n-MnO_x / ZrO₂ sorbents were prepared by precipitation method combined with sol-gel method and phase inversion mothod-impregnation method. The physical properties of the sorbents were analyzed by means of XRD, SEM and BET et.al. The comprehensive evalution of high temperature desulfurization sorbents were carried on the fixed bed reactor. The results are shown below:For different CeO_n doped CeO_n-MnO_x desulfurization sorbents, contrast experiments show that, the desulfurization accuracy and breakthrough time can be effectively improved by moderate CeO_n-doping. When Mn : Ce equals to 10 : 3?by mol?, the sorbent removed H2 S to 4.2 ppm from 1000 ppm concentration, its desulfurization breakthrough time can reach as high as 120 min, and it shows that the sulfur capacity can reach to 25.8 mg of S/100 g of sorbent.Based on the composition?Mn:Ce equals to 10:3?, desulfurization sorbents of CeO_n-MnO_x/ ZrO₂ were prepared by precipitation method combined with sol-gel method. The sorbent?MCZ2? with Zr : Mn mole ratio of 10 : 2 can remove H2 S from 1000 ppm reach to 1.49 ppm. After 5 desulfurization-regeneration cycles, its desulfurization performance did not decay obviously. The desulfurization breakthrough time can stabilize in 660 min, and the breakthrough sulfur capacity can maintain at 140 mg of S/100 g of sorbent.Sorbent?MC3/ZrO₂? with the mole ratio of Mn : Ce equals to 10 : 3 was also prepared by phase inversion method-impregnation method, After 5 desulfurization-regeneration cycles, its desulfurization performance does not decay obviously. The average desulfurization accuracy in cycles of MC3/ZrO₂ desulfurization sorbent can maintain at 2 ppm, its desulfurization breakthrough time can stabilize at as high as 900 min, and it showed that the breakthrough sulfur capacity can maintain at 128.4 mg of S/100 g of sorbent.