Mn、W掺杂菱铁矿催化剂对柴油机尾气SCR脱硝性能的影响

许夏; 归柯庭

doi:10.13205/j.hjgc.201909023

Mn、W掺杂菱铁矿催化剂对柴油机尾气SCR脱硝性能的影响

doi: 10.13205/j.hjgc.201909023

许夏,
归柯庭

东南大学能源与环境学院

基金项目:

国家自然科学基金(51276039)

江苏省环保科研课题(2015008)

详细信息

作者简介:
许夏(1994-),女,硕士,主要研究方向为SCR脱硝催化剂。632536204@qq.com

通讯作者:
归柯庭(1957-),男,博士,教授,主要研究方向为大气污染控制。101000477@seu.edu

中图分类号: X701
计量
- 文章访问数: 29
- HTML全文浏览量: 9
- PDF下载量: 0
- 被引次数: 0
出版历程
- 收稿日期: 2019-01-15
- 网络出版日期: 2023-11-24
- 刊出日期: 2019-09-30

摘要

摘要: 对菱铁矿掺杂Mn、W等过渡金属元素制备催化剂用于柴油机尾气SCR脱硝。500℃煅烧菱铁矿催化剂在30000 h^-1高空速下虽具较高SCR脱硝效率,但活性温度窗口较窄,仅在240~330℃内脱硝效率在90%以上,与柴油机尾气温度(200~400℃)有较大差距,故采用混合搅拌法对菱铁矿催化剂掺杂Mn改性提高其低温活性,掺杂W改性提高其高温活性,从而拓宽活性温度窗口。实验结果表明:单独掺杂3%Mn和3%W时,催化剂温度窗口分别拓宽至180~330℃和240~390℃。同时掺杂Mn和W,掺杂M0. 01W0. 03-菱铁矿催化剂在210~390℃内脱硝效率超过90%,基本符合柴油机尾气排放温度,可适用于柴油机尾气脱硝。运用BET、XRD和NH₃-TPD等方法对催化剂进行表征发现,掺杂后的催化剂比表面积更大、表面结晶更弱、吸附位酸性更强,有利于提高柴油机尾气的SCR脱硝活性。
- SCR脱硝 /
- 菱铁矿 /
- Mn-W共掺杂 /
- 柴油机尾气

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参考文献(23)

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