γ-Al2O3负载多金属复合催化剂选择性催化还原烟气脱硝

以γ-Al₂O₃作为载体，先后负载CeO₂，MnC₂O₄，Fe（NO₃）₃，CrO₃，Ni（NO₃）₂，NH₄VO₃等多种金属组分制备γ-Al₂O₃负载多金属复合催化剂，并用于模拟烟气的选择性催化还原脱硝。通过SEM和XRD技术对催化剂进行了表征。表征结果显示：Fe，Mn，Cr的添加能增加催化剂的低温催化活性、提高催化剂的N₂选择性;γ-Al₂O₃对活性金属氧化物的负载效果良好。实验结果表明：各金属化合物的最佳加入量为 w（MnC₂O₄·2H₂O）=20%，w（Fe（NO₃）₃·9H₂O）=15%，w（CrO₃）=10%，w（Ni（NO₃）₂·6H₂O）=5%，w（NH₄VO₃）=10%，w（CeO₂）=5%，w（γ-Al₂O₃）=35%;以在最佳正交实验条件下制得的γ-Al₂O₃负载多金属复合物为催化剂，在脱硝反应温度为205 ℃的条件下，NO转化率为96.7%;γ-Al₂O₃负载多金属复合催化剂经5次重复使用，NO转化率仍可稳定在94%左右。

γ-Al2O3 Supported Multi-Metal Composite Catalyst for SCR Denitrification of Flue Gas

The γ-Al₂O₃ supported multi-metal composite catalyst was prepared by loading CeO₂,MnC₂O₄,Fe（NO₃）₃,CrO₃,Ni（NO₃）₂ and NH₄VO₃ on γ-Al₂O₃,and was used for SCR denitrification of the simulated flue gas. The catalyst was characterized by SEM and XRD. The characterization results show that：The low-temperature catalytic activity and N₂ selectivity of the catalyst can be improved with the addition of Fe,Mn and Cr;γ-Al₂O₃ supports the active metal oxides well. The optimum dosages of metal compound are as follows：w（MnC₂O₄·2H₂O）=20%,w（Fe（NO₃）₃·9H₂O）=15%,w（CrO₃）=10%,w（Ni（NO₃）₂·6H₂O）=5%,w（NH₄VO₃）=10%,w（CeO₂）=5%,w（γ-Al₂O₃）=35%. When the γ-Al2O3 supported multi-metal complex prepared under the optimum conditions is used as catalyst and the reaction temperature for denitrification is 205 ℃，the NO conversion rate is 96.7%. After theγ-Al2O3 supported multi-metal composite catalyst has used for 5 times，the NO conversion rate can still remain about 94%.