NH3-SCR脱硝催化剂现状及中毒失活现象研究进展

doi:10.19964/j.issn.1006-4990.2021-0735

Abstract

Abstract:

With the promotion of national energy deep peak shaving and the reduction of boiler load operation，it is found that the flue gas temperature at the outlet of the boiler is difficult to drive the selective catalytic reduction denitration reaction.By summarizing the research progress of NH₃-SCR denitration catalyst at home and abroad，it was concluded that the single noble metal catalyst had the factors affecting its catalytic activity，such as narrow temperature window，easy poisoning characteristics and small specific surface area，while the composite metal oxide catalyst，the new biochar catalysts and zeolite catalysts had the advantages of porosity and good stability.The denitration mechanism of the catalyst could be simply expressed as that the acidic sites on its surface adsorbed gaseous NH₃ and O₂ and react with them.The poisoning causes of the catalyst could be summarized as that its internal voids were blocked by alkali metals，metal oxides were preempted by SO₂ and the acidic sites were covered by hydroxyl groups.Specifically，the activity of the catalyst was decreased and the efficiency of NH₃ adsorption was decreased.By comparing the denitration performance of commercial catalysts and emerging catalysts，it was concluded that the future research direction was to develop low-temperature and high-efficiency denitration catalysts with sulfur resistance，water resistance and alkali resistance.

Key words: SCR catalyst, denitration, low temperature, poisoning

CLC Number:

O643.6

LI Kejun,LI Fangqin,REN Jianxing,LIU Xin,CHEN Linfeng,CAI Jianming. Current situation of NH₃-SCR denitration catalyst and research progress on poisoning and deactivation[J]. Inorganic Chemicals Industry, 2022, 54(11): 18-24.

Figures/Tables 5

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Table 1

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催化剂	反应条件	NO _x 最佳转化率
V-W-Ti商品催化剂^[53]	n（NH₃）∶n（NO）=1，5% O₂，24 000 h^-1	93.4%（380 ℃）
1% V₂O₅-10% WO₃/ TiO₂^[54]	1×10^-3 NH₃，1×10^-3 NO，5% O₂，24 000 h^-1	86.98%（370 ℃）
MnO₂-CeO₂纳米球^[17]	5×10^-4 NH₃，5×10^-4 NO，5% O₂，1×10^-4 SO₂，60 000 mL/（g·h）	＞97%（120~250 ℃）
MnO₂-PVP（200）^[18]	5×10^-4 NH₃，5×10^-4 NO，5% O₂，50 000 h^-1	98%（160 ℃）
Ce/Ti-Si（3∶1）^[30]	5×10^-4 NH₃，5×10^-4 NO，3% O₂，28 000 h^-1	90%（250~450 ℃）
MnO _x /TiO₂^[32]	5×10^-4 NH₃，5×10^-4 NO，5% O₂，24 000 h^-1	98%（200 ℃）
CuNd/SAPO-34^[39]	2×10^-4 NH₃，2×10^-4 NO，10% O₂，5% H₂O，40 000 h^-1	86%（200 ℃）
6%V₂O₅-9%WO₃/TiO₂^[49]	7×10^-4 NH₃，7×10^-4 NO，5% O₂，1×10^-3 SO₂，129 670 h^-1	95%~97%（220~300 ℃）
（Cu _x Mn_3-_x ）_1-_δ O₄^[52]	5×10^-4 NH₃，5×10^-4 NO，3% O₂，5% H₂O，5×10^-4 SO₂，100 000 h^-1	80%~90%（150~200 ℃）

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Current situation of NH₃-SCR denitration catalyst and research progress on poisoning and deactivation

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Current situation of NH3-SCR denitration catalyst and research progress on poisoning and deactivation