团絮状双效催化聚苯硫醚滤料反应参数及机理

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中国环境科学 ›› 2019, Vol. 39 ›› Issue (6) : 2344-2353.

大气污染与控制

团絮状双效催化聚苯硫醚滤料反应参数及机理

李银生, 段钰锋, 刘猛, 李娜, 陈聪, 吕剑虹

作者信息 +

Reaction parameters and mechanism of flocculent multifunction polyphenylene sulfide filter

LI Yin-sheng, DUAN Yu-feng, LIU Meng, LI Na, CHEN Cong, LÜ Jian-hong

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文章历史 +

摘要

以N-油酰基多肽表面活化聚苯硫醚滤料，以酸性KMnO₄在60~80℃操作温度下正向滴定，在氧化作用下实现活性组分氧化.实验研究了催化滤料的低温NO还原和Hg⁰氧化性能，并通过SEM、EDX及TPD表征手段对催化滤料物化结构进行分析.分别考察了（0.9）Mn-Ce-Fe-Co-O_x/PPS反应体系温度、气相O₂浓度、初始NO浓度、氨氮比（NSR）、入口SO₂浓度的最佳反应参数.结果表明，有效组分MnO_x、CeO_x、CoO_x、Fe₂O₃以团絮状均匀分散在纤维表面；在反应温度170℃、O₂≥5%、NO≤500×10^-6、氨氮比1.0、SO₂≤100 500×10^-6条件下，催化滤料对NO还原及Hg⁰氧化效率基本达到80%左右；程序升温脱附实验Hg-TPD结果表明SO₂的Hg⁰氧化促进作用机理于SO₃与Hg⁰非均相反应优于SO₂硫酸化反应，而NO-TPD结果则表明NO与O₂在PPS表面相互作用类型以吸附态亚硝酸盐为主，吸附态NO₂次之.

Abstract

The in-situ generation method was proposed to prepare the catalytic functional polyphenylene sulfide (PPS) filter material. PPS would be activated with C₂₁H₄₀NNaO₄S, and then treated in the metallic cations solution to adsorb Mn²⁺, Fe²⁺, Co²⁺, Ce³⁺ rapidly. After positive reaction with KMnO₄, reactive metal oxides were produced in the PPS materials. The (0.9) Mn-Ce-Fe-Co-O_x/PPS composite filter materials were characterized by SEM, EDX and TPD. Catalytic performance in the low -temperature catalytic conversion of NO and Hg⁰ were then explored. The influences of reaction temperature, O₂, NO, ammonia-nitrogen ratio and SO₂ on the catalytic performance of catalytic PPS were investigated systematically. The results showed that MnO_x, CeO_x, CoO_x, Fe₂O₃ were uniformly distributed on the PPS filter material in a flocculent structure; The catalytic PPS materials performed a synergistically NO and Hg⁰ removal efficiency of more than 80% in the conditions of T=170℃,O₂≥5%, NO≤ 500×10^-6, NSR=1.0, SO₂≤100×10^-6; The results of Hg-TPD desorption indicated that the mechanism of Hg⁰ oxidation promotion of SO₂ was that the heterogeneous reaction between SO₃ and Hg⁰ was faster than sulfation reaction of SO₂, and the NO-TPD results also showed that NO mainly acted in the form of nitrite on the surface of PPS, and followed by the form of adsorbed NO₂.

导出引用

李银生, 段钰锋, 刘猛, 李娜, 陈聪, 吕剑虹. 团絮状双效催化聚苯硫醚滤料反应参数及机理[J]. 中国环境科学. 2019, 39(6): 2344-2353

LI Yin-sheng, DUAN Yu-feng, LIU Meng, LI Na, CHEN Cong, LÜ Jian-hong. Reaction parameters and mechanism of flocculent multifunction polyphenylene sulfide filter[J]. China Environmental Science. 2019, 39(6): 2344-2353

中图分类号： X511

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