煅烧温度对铈改性赤泥催化剂脱硝性能的影响  

Effect of Calcination Temperature on Selective Catalytic Reduction of Ce-modified Red Mud Catalyst

作　　者：陈邱谆 丁凯 路春美[1,2] 巩志强[1,2] 吕泽康 CHEN Qiu-zhun;DING Kai;LU Chun-mei;GONG Zhi-qiang;LV Ze-kang(School of Energy and Power Engineering,Shandong University,Shandong Jinan 250061;National Engineering Laboratory for Coal-burning Pollutants Emission Reduction,Shandong University,Shandong Jinan 250061,China)

机构地区：[1]山东大学能源与动力工程学院,山东济南250061 [2]山东大学燃煤污染物减排国家工程实验室,山东济南250061

出　　处：《广州化工》2020年第21期46-49,共4页GuangZhou Chemical Industry

基　　金：国家自然科学基金(No:51576117);山东省重点研发计划(No:2018GSF117034)。

摘　　要：采用沉积-沉淀法制备铈改性赤泥催化剂,考察了煅烧温度对催化剂脱硝性能的影响。结果表明,煅烧温度500℃时制备的赤泥催化剂(Ce-ARM-500)具有最佳的脱硝性能,在248~408℃的温度区间内均能保持90%以上的NOx转化率。与Ce-ARM-450、Ce-ARM-550和Ce-ARM-600相比,Ce-ARM-500具有更合理的堆积孔结构,能提供更多的活性吸附位点。NH3-TPD结果表明Ce-ARM-500具有较多的酸性位,有利于NH3吸附。煅烧温度过高会抑制催化剂表面还原性和对NH3的吸附,这归因于催化剂表面酸性位(尤其是Lewis酸性位)减少。Ce-modified red mud catalyst was prepared by deposition-precipitation method and the effect of calcination temperature on the denitrification performance of the catalyst was investigated.The results indicated that the red mud catalyst(Ce-ARM-500)prepared at 500℃exhibited the best NH 3-SCR performance and kept more than 90%NO x conversion in the range of 248~408℃.Compared with Ce-ARM-450,Ce-ARM-550 and Ce-ARM-600,Ce-ARM-500 had more reasonable accumulated pore structure and could provide more adsorption active sites.NH 3-TPD experiments showed that Ce-ARM-500 had more acid sites,which benefited NH 3 adsorption.Excessive calcination temperature inhibited reducibility and NH 3 adsorption,which was mainly attributed the decrease of the acid sites(especially the Lewis acid sites).

关 键 词：选择性催化还原 催化剂 赤泥 煅烧温度 

分 类 号：X756[环境科学与工程—环境工程]