文章摘要
CO2对氧化铁NH3-SCR脱硝性能的影响研究:吸附行为
Effect of CO2 on NH3-SCR Performance of Fe2O3: Adsorption Behavior
投稿时间:2022-05-09  修订日期:2022-05-25
DOI:
中文关键词: NH3-SCR  吸附行为  CO2  Fe2O3
英文关键词: NH3-SCR  adsorption behavior  CO2  Fe2O3
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目),
作者单位邮编
乔玉洁 大连理工大学环境学院 116024
龚蕾 大连理工大学环境学院 
董世城 大连理工大学环境学院 
王辉 大连理工大学环境学院 116024
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中文摘要:
      考虑到CO2是固定源和移动源废气中的主要组分,Fe2O3是铁基催化剂中的重要活性物质,本文研究了CO2对Fe2O3催化剂的NH3-SCR(NH3 Selective Catalytic Reduction)脱硝性能的影响.NH3-SCR结果表明,CO2的加入在300 ℃以下明显抑制了催化剂的NH3-SCR性能.这主要是因为CO2的存在改变了催化剂表面NH3/NOx的吸附行为,从而影响了SCR反应.原位红外和程序升温脱附实验结果表明,CO2可以被吸附活化成碳酸盐物质;这种碳酸盐物质可以作为新的酸性位点吸附NH3物种,促进催化剂对NH3的吸附;但同时CO2和NOx之间存在竞争吸附,这会导致催化剂表面的关键NO2物种和硝酸盐物种的产生减少,从而抑制SCR反应.
英文摘要:
      Considering that CO2 is the main component in exhaust gases which come from stationary and mobile source and Fe2O3 acting as an essential active substance exists in iron-based catalysts, the effect of CO2 on NH3-SCR (NH3 Selective Catalytic Reduction) performance of Fe2O3 catalyst has been investigated in this paper. NH3-SCR results show that the addition of CO2 significantly impedes the NH3-SCR performance below 300 ℃. This is mainly because the presence of CO2 changes the adsorption behavior of NH3/NOx on the catalyst surface, which further affects the SCR reaction. The results of in situ DRIFTS and TPD experiments show that CO2 could be adsorbed and activated to form carbonate species, which may act as new acidic sites to adsorb NH3 species and therefore promote ad-NH3 species on the catalyst. However, the competitive adsorption between CO2 and NOx leads to a reduction in the production of key NO2 species and nitrate species and thus the SCR reaction is inhibited.
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