| 一种新型高比表面积 TiO2载体在 NH3选择性催化还原反应中对 V2O5分散性的促进作用 |
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| 引用本文： | 刘欣,李俊华,李想,彭悦,王虎,江晓明,王兰武.一种新型高比表面积 TiO2载体在 NH3选择性催化还原反应中对 V2O5分散性的促进作用[J].催化学报,2016(6):878-887. |
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| 作者姓名： | 刘欣 李俊华 李想 彭悦 王虎 江晓明 王兰武 |
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| 作者单位： | 1. 清华大学环境学院环境模拟与污染控制国家重点联合实验室,北京,100084;2. 大唐南京环保科技有限责任公司,江苏南京,211111;3. 四川华铁钒钛科技股份有限公司,四川攀枝花,617200 |
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| 基金项目： | 21221004)，the National High Technology Research and Development Program of China(863 Program)，the State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Com-plex.@@@@基金来源:国家自然科学基金(21325731;21221004)，国家高技术研究发展计划(863计划;2013AA065304)，国家环境保护大气复合污染来源与控制重点实验室 |
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| 摘 要： | A titania support with a large surface area was developed, which has a BET surface area of 380.5 m2/g, four times that of a traditional titania support. The support was ultrasonically impregnated with 5 wt%vanadia. A special heat treatment was used in the calcination to maintain the large sur‐face area and high dispersion of vanadium species. This catalyst was compared to a common V2O5‐TiO2 catalyst with the same vanadia loading prepared by a traditional method. The new cata‐lyst has a surface area of 117.7 m2/g, which was 38%higher than the traditional V2O5‐TiO2 catalyst. The selective catalytic reduction (SCR) performance demonstrated that the new catalyst had a wid‐er temperature window and better N2 selectivity compared to the traditional one. The NO conver‐sion was>80%from 200 to 450 °C. The temperature window was 100 °C wider than the traditional catalyst. Raman spectra indicated that the vanadium species formed more V‐O‐V linkages on the catalyst prepared by the traditional method. The amount of V‐O‐Ti and V=O was larger for the new catalyst. Temperature programmed desorption of NH3, temperature programmed reduction by H2 and X‐ray photoelectron spectroscopy results showed that its redox ability and total acidity were enhanced. The results are helpful for developing a more efficient SCR catalyst for the removal of NOx in flue gases.
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| 关 键 词： | 钒钛体系催化剂 脱硝 二氧化钛 比表面积 分散性 |
NH3 selective catalytic reduction of NO:A large surface TiO2 support and its promotion of V2O5 dispersion on the prepared catalyst |
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| Xin Liu,Junhua Li,Xiang Li,Yue Peng,Hu Wang,Xiaoming Jiang,Lanwu Wang.NH3 selective catalytic reduction of NO:A large surface TiO2 support and its promotion of V2O5 dispersion on the prepared catalyst[J].Chinese Journal of Catalysis,2016(6):878-887. |
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| Authors: | Xin Liu Junhua Li Xiang Li Yue Peng Hu Wang Xiaoming Jiang Lanwu Wang |
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| Abstract: | A titania support with a large surface area was developed, which has a BET surface area of 380.5 m2/g, four times that of a traditional titania support. The support was ultrasonically impregnated with 5 wt%vanadia. A special heat treatment was used in the calcination to maintain the large sur‐face area and high dispersion of vanadium species. This catalyst was compared to a common V2O5‐TiO2 catalyst with the same vanadia loading prepared by a traditional method. The new cata‐lyst has a surface area of 117.7 m2/g, which was 38%higher than the traditional V2O5‐TiO2 catalyst. The selective catalytic reduction (SCR) performance demonstrated that the new catalyst had a wid‐er temperature window and better N2 selectivity compared to the traditional one. The NO conver‐sion was>80%from 200 to 450 °C. The temperature window was 100 °C wider than the traditional catalyst. Raman spectra indicated that the vanadium species formed more V‐O‐V linkages on the catalyst prepared by the traditional method. The amount of V‐O‐Ti and V=O was larger for the new catalyst. Temperature programmed desorption of NH3, temperature programmed reduction by H2 and X‐ray photoelectron spectroscopy results showed that its redox ability and total acidity were enhanced. The results are helpful for developing a more efficient SCR catalyst for the removal of NOx in flue gases. |
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| Keywords: | V2O5-TiO2 catalyst Denitrification Titania Surface area Dispersibility |
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