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化工学报  2015 

SCR脱硝中催化剂表面NH4HSO4生成及分解的原位红外研究

DOI: 10.11949/j.issn.0438-1157.20150450, PP. 4460-4468

Keywords: 原位红外光谱,选择催化还原,催化剂,脱硝,NH4HSO4,化学反应

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Abstract:

采用工业用V2O5-WO3/TiO2催化剂,基于傅里叶原位红外光谱(insituFT-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。

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