FT-IR study of formation and decomposition of ammonium bisulfates on surface of SCR catalyst for nitrogen removal

SHU Hang; ZHANG Yuhua; FAN Hongmei; ZHANG Yaping; YANG Linjun

doi:10.11949/j.issn.0438-1157.20150450

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FT-IR study of formation and decomposition of ammonium bisulfates on surface of SCR catalyst for nitrogen removal

更新时间：2025-12-10

- FT-IR study of formation and decomposition of ammonium bisulfates on surface of SCR catalyst for nitrogen removal
- CIESC Journal Issue 11, Pages: 4460-4468(2015)
- 作者机构：
  
  东南大学能源与环境学院, 能源热转换及其过程测控教育部重点实验室,江苏,南京,210096
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20150450
  CLC： 511
- Online First：05 November 2015，
  
  Published：05 November 2015
- 稿件说明：
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SHU Hang, ZHANG Yuhua, FAN Hongmei, et al. FT-IR study of formation and decomposition of ammonium bisulfates on surface of SCR catalyst for nitrogen removal[J]. CIESC Journal, 2015, (11): 4460-4468.
DOI：

SHU Hang, ZHANG Yuhua, FAN Hongmei, et al. FT-IR study of formation and decomposition of ammonium bisulfates on surface of SCR catalyst for nitrogen removal[J]. CIESC Journal, 2015, (11): 4460-4468. DOI： 10.11949/j.issn.0438-1157.20150450.

摘要

采用工业用V2O5-WO3/TiO2催化剂

基于傅里叶原位红外光谱(in situ FT-IR)技术考察了SCR脱硝过程中催化剂表面NH4HSO4的生成与分解特性。结果表明:在V2O5-WO3/TiO2催化剂表面ABS的生成可由催化剂V═O基团上Lewis酸上配位吸附活化态的NH3在O2环境中与SO2反应生成

也可由SO2与催化剂表面反应生成的吸附态金属硫酸盐中间物VOSO4与气态NH3直接反应生成;NO能通过与NH4HSO4中的NH4+直接反应来降低NH4HSO4降解的温度窗口

促进其在催化剂表面的分解行为

NO的脱除与NH4HSO4的生成是相互抑制关系;NH4HSO4本身的负载量影响其分解与挥发行为。

Abstract

The mechanism of ammonium bisulfate formation and decomposition over a commercial V2O5-WO3/TiO2 catalyst was explored using FT-IR. The results suggest that the formation of ammonium bisulfates mainly occurs in two ways: reaction between activated NH3 adsorbed coordinatedly on Lewis acid sites of catalyst V═O groups and SO2 under atmosphere containing O2;and reaction between absorbed intermediate of metal sulfates VOSO4 and gaseous NH3. NO could react directly with NH4+ in NH4HSO4

which could lower its decomposition temperature

promoting the catalytic decomposition of adsorbed bisulfates (ABS) on catalyst surface. So

there is mutual inhibition between NO removal and ABS formation. Loading of ABS deposited on catalyst surface also affects its decomposition and volatilization.

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