Comparison study of Na poisoning effect on copper-based chabazite micropore catalysts for NH<sub>3</sub>-SCR reaction

WANG Chen; CHEN Zexiang; WANG Jianqiang; SHEN Meiqing; WANG Jun

doi:10.11949/0438-1157.20200408

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Comparison study of Na poisoning effect on copper-based chabazite micropore catalysts for NH₃-SCR reaction

Catalysis\, kinetics and reactors | 更新时间：2026-07-24

- Comparison study of Na poisoning effect on copper-based chabazite micropore catalysts for NH₃-SCR reaction
- CIESC Journal Vol. 71, Issue 12, Pages: 5551-5560(2020)
- 作者机构：
  
  1.天津大学化工学院，天津 300350
  2.中北大学环境与安全工程学院，山西太原 030051
  3.天津大学内燃机国家重点实验室，天津 300072
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20200408
  CLC： TQ 028.8
- Received：17 April 2020，
  
  Revised：2020-07-12，
  
  Online First：17 December 2020，
  
  Published：05 December 2020
- 稿件说明：
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王晨, 陈泽翔, 王建强, 沈美庆, 王军. 基于NH₃-SCR反应铜基小孔分子筛催化剂Na中毒对比研究[J]. 化工学报, 2020, 71(12): 5551-5560 DOI: 10.11949/0438-1157.20200408.

WANG Chen, CHEN Zexiang, WANG Jianqiang, SHEN Meiqing, WANG Jun. Comparison study of Na poisoning effect on copper-based chabazite micropore catalysts for NH₃-SCR reaction[J]. CIESC Journal, 2020, 71(12): 5551-5560 DOI: 10.11949/0438-1157.20200408.
王晨, 陈泽翔, 王建强, 沈美庆, 王军. 基于NH₃-SCR反应铜基小孔分子筛催化剂Na中毒对比研究[J]. 化工学报, 2020, 71(12): 5551-5560 DOI: 10.11949/0438-1157.20200408. DOI：

WANG Chen, CHEN Zexiang, WANG Jianqiang, SHEN Meiqing, WANG Jun. Comparison study of Na poisoning effect on copper-based chabazite micropore catalysts for NH₃-SCR reaction[J]. CIESC Journal, 2020, 71(12): 5551-5560 DOI: 10.11949/0438-1157.20200408. DOI：

摘要

以浸渍法模拟碱金属中毒NH

-SCR催化剂过程，制备不同Na含量（质量分数）的铜基小孔分子筛Cu/SSZ-13和Cu/SAPO-34，对比研究了二者的碱金属中毒机理。结果表明，外引Na离子均可严重影响两种催化剂的NH

-SCR催化活性，造成催化剂的晶相结构坍塌，酸性量减少，活性物种减少。不同的是，Na引入量较低（

1.82%）时，Cu/SAPO-34比Cu/SSZ-13具有更强的Na离子耐受性，而当Na含量高于3.48%时，Cu/SAPO-34几乎完全丧失NH

-SCR催化活性。通过催化剂的结构表征（BET、XRD和SEM）和酸性位表征（DRIFTS、NH

-TPD和H

-TPR），研究表明随着Na中毒程度的加深，Cu/SSZ-13的结构破坏是渐变式的，而Cu/SAPO-34的结构破坏是突变式的；Na中毒的机理研究表明，酸性位的减少是Cu/SSZ-13的SCR活性下降的主导原因，结构坍塌是Cu/SAPO-34的SCR活性下降的主导原因。

Abstract

Using wet impregnation method to mimic alkali metal poison of ammonia-selective catalytic reduction (NH

-SCR) catalysts

Cu-based micropore zeolites Cu/SSZ-13 and Cu/SAPO-34 with different Na contents(mass fraction) were prepared

and the Na poisoning mechanism on them was studied. The results show that the externally introduced Na ions can severely affect the NH

-SCR catalytic activity of the two catalysts

resulting in the collapse of the crystal structure of the catalyst

the decrease of acidity and the reduction of active species. In detail

when Na content was less than 1.82%

Cu/SAPO-34 has higher resistance of Na ions than Cu/SZZ-13; while when Na

3.48%

Cu/SAPO-34 catalysts almost deactivated thoroughly. By structural characterization (BET

XRD and SEM) and acidity characterization (DRIFTS

-TPD and H

-TPR)

it was found that with Na poisoning deeper and deeper

Cu/SSZ-13 took a gradual style of the structural destruction

but Cu/SAPO-34 adopted a sudden way. Studies on the mechanism of Na poisoning show that the decrease of acid sites is the main reason for the decrease of SCR activity of Cu/SSZ-13

and th

e structural collapse is the main reason for the decrease of SCR activity of Cu/SAPO-34.

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⁰

Comparison study of Na poisoning effect on copper-based chabazite micropore catalysts for NH3-SCR reaction

DOI：10.11949/0438-1157.20200408

摘要

Abstract

关键词

Keywords

references

Comparison study of Na poisoning effect on copper-based chabazite micropore catalysts for NH₃-SCR reaction