摘要
采用水热法制备了以硫酸锰为前驱体的MnO_(2)催化剂,以氯苯作为二英的分子模拟物,对比了不同水热合成温度下制备的催化剂同时脱硝脱氯苯的催化性能,并进行了表征。结果表明:90℃合成的催化剂呈现α-MnO_(2)晶相,表现出较好的同时脱硝脱氯苯活性,并且具有良好的催化稳定性,连续反应16 h后仍保持较高的活性,这与其较大的比表面积、较高的表面Mn^(3+)比例以及丰富的表面活性氧物种有关;180℃合成的催化剂呈现出γ-MnO_(2)晶相,虽然也具有较好的催化活性,但稳定性较差;150℃合成的催化剂呈现出β-MnO_(2)晶相,催化活性较差。
The MnO_(2) catalyst was prepared by hydrothermal method using manganese sulfate as precursor.With chlorobenzene as molecular mimic of dioxins,the catalytic activities of the catalysts prepared at different hydrothermal synthesis temperatures on simultaneous denitration and chlorobenzene removal were compared.The results show that:The catalyst synthesized at 90℃presents α-MnO_(2) crystal phase,exhibits good activity on simultaneous denitration and chlorobenzene removal,and has good catalytic stability and maintains higher activity after 16 h of continuous reaction,which are associated with its larger specific surface area,higher surface Mn^(3+) ratio and abundant surface active oxygen species;The catalyst synthesized at 180℃presents aγ-MnO_(2) crystal phase,has good catalytic activity but poor stability;The catalyst synthesized at 150℃presentsβ-MnO_(2) crystal phase and has poor catalytic activity.
作者
梅蓉
宋静
梅超强
李雪
金奇杰
徐海涛
MEI Rong;SONG Jing;MEI Chaoqiang;LI Xue;JIN Qijie;XU Haitao(School of Environmental Science and Engineering,Nanjing Tech University,Nanjing 211816,China;Nanjing Gekof Institute of Environmental Protection Technology&Equipment Co.Ltd.,Nanjing 211106,China)
出处
《化工环保》
CAS
CSCD
北大核心
2022年第3期285-292,共8页
Environmental Protection of Chemical Industry
基金
江苏省重点研发计划项目(BE2018074)
南京市科技顶尖专家集聚计划项目
江苏省国际合作项目(BZ2021018)
苏州市科技计划项目(SGC2020092)。
关键词
水热合成温度
氮氧化物
氯苯
催化脱除
hydrothermal synthesis temperature
nitrogen oxides
chlorobenzene
catalytic removal
