载体改性提高船舶尾气锰铬催化剂的脱硝性能

材料导报

2022, Vol. 36

Issue (Z1): 21080248-6

无机非金属及其复合材料

载体改性提高船舶尾气锰铬催化剂的脱硝性能

赵颖平¹, 陶平¹, 李文华¹, 闵秀博², 余忆玄², 孙天军^1,2

1 大连海事大学环境科学与工程学院,辽宁大连 116023
2 大连海事大学轮机工程学院,辽宁大连 116023

Support Modification Improves the Denitrification Performance of Ship Exhaust Manganese-Chromium Catalyst

ZHAO Yingping¹, TAO Ping¹, LI Wenhua¹, MIN Xiubo², YU Yixuan², SUN Tianjun^1,2

1 Environmental Science and Engineering College, Dalian Maritime University, Dalian 116023, Liaoning, China
2 Maritime Engineering College, Dalian Maritime University, Dalian 116023, Liaoning, China

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摘要通过共沉淀法制备了ZrO₂、Al₂O₃、CeO₂、CeO₂-ZrO₂和CeO₂-Al₂O₃不同载体改性的Mn-Cr脱硝催化剂,通过BET、XRD、SEM、H₂-TPR、NH₃-TPD以及XPS等表征手段对制备的脱硝催化剂的微观结构进行了研究,并考察其低温船舶尾气选择催化还原(SCR)脱硝性能。结果表明,载体可以显著改善锰铬催化剂的比表面积,提高催化剂酸性位点数量和强度,进而提升低温脱硝性能;除ZrO₂载体外,所得催化剂在175~275 ℃、空速100 000 h^-1模拟船舶尾气条件下的NO转化率大于90%;其中,CeO₂和CeO₂-Al₂O₃载体的Mn-Cr催化剂在225 ℃、150×10^-6 SO₂条件下的NO转化率大于80%,低温脱硝性能优良。高价态金属元素可以促进SCR 反应,提高催化剂的低温活性和耐硫性。

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关键词: 船舶尾气低温脱硝金属氧化物选择催化还原

Abstract: The manganese-chromium denitration catalysts with different supports of ZrO₂, Al₂O₃, CeO₂, CeO₂-ZrO₂ and CeO₂-Al₂O₃ were prepared by the co-precipitation method. The microstructure characterizations of the as-synthesized catalysts were measured by BET, XRD, SEM, H₂-TPR, NH₃-TPD andXPS analyses, and the SCR denitrification performances of the catalysts for ship exhaust gas at low-temperature were investigated. The results show that the supports dramatically improve the specific surface area of the manganese-chromium catalyst, increase the number and strength of the acidic sites on catalysts, and improve the denitrification performance at low-temperature. Except for ZrO₂ support, the NO conversions of all catalysts exceed 90% under a simulative exhaust gas treatment condition with a temperature of 175—275 ℃ and a space velocity of 100 000 h^-1. In addition, the NO conversion rates of CeO₂ and CeO₂-Al₂O₃ support catalysts were more than 80% at 225 ℃ accompanied by SO₂ at 150×10^-6, preserving excellent denitration performance at low-temperature. High-valencce metal elements can promote the SCR reaction and improve the low-temperature activity and sulfur resistance.

Key words: ship exhaust gas low-temperature denitration metal oxide selective catalytic reduction

出版日期: 2022-06-05 发布日期: 2022-06-08

ZTFLH:

X511

基金资助: 国家自然科学基金(21776266)

通讯作者: suntianjun@dlmu.edu.cn

作者简介: 赵颖平,2018年6月于大连交通大学获得工学学士学位,现为大连海事大学环境科学与工程学院硕士研究生,在孙天军教授的指导下进行研究。目前主要从事船舶尾气脱硝催化剂方面的研究。
孙天军,大连海事大学轮机工程学院教授、博士研究生导师。2007年于大连理工大学化学工艺专业博士毕业,2008年到中国科学院大连化学物理研究所工作,2011年聘为副研究员,2017年聘为研究员,2019年到大连海事大学轮机工程学院工作至今。主要从事船舶与海洋环保节能领域的应用研究,发表论文70多篇,包括JMCA, Chem.Comm., Chem.Eng.J, Sep.Purif.Tech, Chemosphere, I&EC等。

引用本文:

赵颖平, 陶平, 李文华, 闵秀博, 余忆玄, 孙天军. 载体改性提高船舶尾气锰铬催化剂的脱硝性能[J]. 材料导报, 2022, 36(Z1): 21080248-6.
ZHAO Yingping, TAO Ping, LI Wenhua, MIN Xiubo, YU Yixuan, SUN Tianjun. Support Modification Improves the Denitrification Performance of Ship Exhaust Manganese-Chromium Catalyst. Materials Reports, 2022, 36(Z1): 21080248-6.

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http://www.mater-rep.com/CN/ 或 http://www.mater-rep.com/CN/Y2022/V36/IZ1/21080248

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