商用SCR脱硝催化剂K2O中毒后再生:(NH4)2SO4溶液

商雪松; 陈进生; 胡恭任; 何炽; 李建荣; 喻小伟

商用SCR脱硝催化剂K₂O中毒后再生:(NH₄)₂SO₄溶液

1.
中国科学院城市环境研究所, 福建厦门 361021;
2.
华侨大学化工学院, 福建厦门 361021

基金项目: 宁波市科技创新团队项目(201182001); 福建省自然科学基金面上项目(2011J01060)。

详细信息

通讯作者:
陈进生, Tel: 0592-6190765, E-mail: jschen@iue.ac.cn。

中图分类号: O643.36⁺2
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- 文章访问数: 1670
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- PDF下载量: 977
- 被引次数: 0
出版历程
- 收稿日期: 2011-09-23
- 修回日期: 2011-11-02
- 刊出日期: 2012-06-30

Regeneration of commercial de-NO_x SCR catalysts poisoned by K₂O with (NH₄)₂SO₄ solution

1.
Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China;
2.
School of Chemical Engineering, Huaqiao University, Xiamen 361021, China

摘要

摘要: 利用(NH₄)₂SO₄溶液对K₂O中毒后烟气SCR (selective catalytic reduction)脱硝商用催化剂活性进行再生。采用湿法浸渍法使催化剂表面负载不同质量K₂O,前驱体为KNO₃溶液。经过再生工艺处理后,在不同模拟烟气空速及氧浓度条件下均具有良好的活性。进一步利用离子色谱(IC)、N₂吸附脱附分析(BET)、扫描电镜及其元素能谱分析(SEM-Maps, EDX)、红外光谱分析(FT-IR)等技术对再生前后催化剂进行表征。结果表明,再生工艺对K₂O去除效果明显,有效地恢复了催化剂表面活性位V=O。此外,再生过程没有导致催化剂表面物质的流失及机械强度的降低。
- 选择性催化还原 /
- 催化剂 /
- K₂O /
- 中毒 /
- 再生 /
- (NH₄)₂SO₄溶液
Abstract: A commercial de-NO_x catalyst for selective catalytic reaction (SCR) poisoned by K₂O was regenerated with (NH₄)₂SO₄ solution. The poisoning was simulated by loading different concentrations of K₂O in the de-NO_x catalysts through wet impregnation with KNO₃ solution as the K₂O precursor. After regeneration with (NH₄)₂SO₄ solution, the poisoned catalysts exhibit effective activity under the simulated conditions of different space velocities and oxygen concentrations. The catalysts before and after regeneration were characterized by ion chromatogram (IC), nitrogen physical sorption, scanning electron microscope and energy dispersive atomic X-ray spectroscopy (SEM-Maps/EDX), and infrared spectroscopy (FT-IR). The results indicated that the regeneration process is effective to remove K₂O from the poisoned catalysts and to restore the active sites of V=O, while the surface substances and mechanical properties of the regenerated catalysts are not significantly influenced by the regeneration.
- selective catalytic reduction (SCR) /
- catalyst /
- K₂O /
- poisoning /
- regeneration /
- (NH₄)₂SO₄ solution

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参考文献(28)

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商用SCR脱硝催化剂K₂O中毒后再生:(NH₄)₂SO₄溶液

通讯作者:
陈进生, Tel: 0592-6190765, E-mail: jschen@iue.ac.cn。

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Regeneration of commercial de-NO_x SCR catalysts poisoned by K₂O with (NH₄)₂SO₄ solution

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