陆强1,
韩健1,
杨江毅1,2,
李文艳2,
杨勇平1
1.华北电力大学生物质发电成套设备国家工程实验室，北京 102206
2.华北电力大学能源动力与机械工程学院，北京 102206
基金项目: 国家重点基础研究发展计划（973）项目（2015CB251501）
北京科技新星计划项目（Z171100001117064）
Effect of preparation technology on De-NOx performance of V2O5/TiO2 SCR catalysts
LI Hui1,2,LU Qiang1,
HAN Jian1,
YANG Jiangyi1,2,
LI Wenyan2,
YANG Yongping1
1.National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, Beijing 102206, China
2.School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China
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摘要:围绕SCR脱硝催化剂制备工艺中活性组分负载顺序和钒助溶剂2个关键因素，分别制备了钒钨体系和钒钼体系催化剂，比较了不同条件下制备的催化剂的脱硝活性，并利用X射线光电子能谱分析（XPS）、程序升温还原（H2-TPR）和程序升温脱附（NH3-TPD）等手段进行表征。结果表明，活性组分与助剂同时负载制备的催化剂，其低价钒和化学吸附氧的比例最高，钒的还原温度最低，酸性位数量最多，表现出最好的脱硝活性；相较于常规助溶剂单乙醇胺，以草酸为助溶剂制备的催化剂，其低价钒和化学吸附氧比例更高，氧化还原性能和表面酸性更强，脱硝活性更好。
关键词: SCR催化剂/
烟气脱硝/
负载顺序/
助溶剂/
催化活性
Abstract:V-W and V-Mo catalysts were prepared focusing on the two key points during the preparation process of SCR denitrification catalyst, i.e., the active components loading sequences and the cosolvents of vanadium. The denitrification activities of the catalysts prepared with different methods were compared, and the catalysts were also characterized by X-ray photoelectron spectroscopy (XPS), temperature-programmed reduction (H2-TPR) and temperature programmed desorption (NH3-TPD). The results showed that the catalysts prepared via simultaneous loading of the active component and promoter exhibited the highest proportions of low valence vanadium and chemisorbed oxygen, the lowest reduction temperature of vanadium, largest amount of acid sites, and thus, possessing the best denitrification activity. In addition, compared to conventional cosolvent monoethanolamine, the catalysts prepared with oxalic acid showed higher proportions of low valence vanadium and chemisorbed oxygen, better oxidation-reduction performance as well as stronger surface acidity, resulting in better denitrification activity.
Key words:SCR catalyst/
flue gas denitrification/
loading sequence/
cosolvent/
catalytic activity.
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制备工艺对V2O5/TiO2 SCR催化剂脱硝性能的影响
李慧1,2,陆强1,
韩健1,
杨江毅1,2,
李文艳2,
杨勇平1
1.华北电力大学生物质发电成套设备国家工程实验室，北京 102206
2.华北电力大学能源动力与机械工程学院，北京 102206
基金项目: 国家重点基础研究发展计划（973）项目（2015CB251501） 北京科技新星计划项目（Z171100001117064）
关键词: SCR催化剂/
烟气脱硝/
负载顺序/
助溶剂/
催化活性
摘要:围绕SCR脱硝催化剂制备工艺中活性组分负载顺序和钒助溶剂2个关键因素，分别制备了钒钨体系和钒钼体系催化剂，比较了不同条件下制备的催化剂的脱硝活性，并利用X射线光电子能谱分析（XPS）、程序升温还原（H2-TPR）和程序升温脱附（NH3-TPD）等手段进行表征。结果表明，活性组分与助剂同时负载制备的催化剂，其低价钒和化学吸附氧的比例最高，钒的还原温度最低，酸性位数量最多，表现出最好的脱硝活性；相较于常规助溶剂单乙醇胺，以草酸为助溶剂制备的催化剂，其低价钒和化学吸附氧比例更高，氧化还原性能和表面酸性更强，脱硝活性更好。
English Abstract
Effect of preparation technology on De-NOx performance of V2O5/TiO2 SCR catalysts
LI Hui1,2,LU Qiang1,
HAN Jian1,
YANG Jiangyi1,2,
LI Wenyan2,
YANG Yongping1
1.National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, Beijing 102206, China
2.School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China
Keywords: SCR catalyst/
flue gas denitrification/
loading sequence/
cosolvent/
catalytic activity
Abstract:V-W and V-Mo catalysts were prepared focusing on the two key points during the preparation process of SCR denitrification catalyst, i.e., the active components loading sequences and the cosolvents of vanadium. The denitrification activities of the catalysts prepared with different methods were compared, and the catalysts were also characterized by X-ray photoelectron spectroscopy (XPS), temperature-programmed reduction (H2-TPR) and temperature programmed desorption (NH3-TPD). The results showed that the catalysts prepared via simultaneous loading of the active component and promoter exhibited the highest proportions of low valence vanadium and chemisorbed oxygen, the lowest reduction temperature of vanadium, largest amount of acid sites, and thus, possessing the best denitrification activity. In addition, compared to conventional cosolvent monoethanolamine, the catalysts prepared with oxalic acid showed higher proportions of low valence vanadium and chemisorbed oxygen, better oxidation-reduction performance as well as stronger surface acidity, resulting in better denitrification activity.
