Influence of arsenic in flue gas on the performance of V2O5-WO3/TiO2 catalyst in selective catalytic reduction of NOx
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摘要: 通过将商业V2O5-WO3/TiO2脱硝催化剂暴露于含As2O3烟气中,制备了砷中毒催化剂,并运用X射线衍射(XRD)、比表面积(BET)、NH3化学吸附、傅里叶变换红外光谱(FT-IR)、X射线光电子能谱等技术表征分析了砷对催化剂性能的影响,并提出了催化剂砷中毒机理。结果表明,砷对催化剂具有严重的毒害作用,As2O3会吸附在催化剂表面,并被催化剂氧化形成As2O5覆盖层,减小催化剂比表面积,减少催化剂V活性位,阻止催化剂对NH3的吸附,造成催化剂失活。
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关键词:
- 砷中毒 /
- V2O5-WO3/TiO2催化剂 /
- As2O3 /
- 失活
Abstract: The effect of arsenic on the performance of commercial V2O5-WO3/TiO2 catalyst for selective catalytic reduction (SCR) of NOx was investigated with the assistance of XRD, N2 sorption, NH3 chemisorption, FT-IR and XPS; an arsenic poisoning mechanism was proposed. The results illustrated that As2O3 in flue gas is a serious toxicant to the V2O5-WO3/TiO2 catalyst. As2O3 adsorbed on the catalyst are mostly oxidized to As2O5, which covers the catalyst surface and results in a decrease of surface area and active V sites; as a result, the adsorption of NH3 is then inhibited, which leads to the deactivation of the V2O5-WO3/TiO2 catalyst for SCR.-
Key words:
- arsenic poisoning /
- V2O5-WO3/TiO2 catalyst /
- As2O3 /
- denitration
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图 2 不同温度下砷对催化剂脱硝效率的影响
Figure 2 Effect of arsenic on the activity of V2O5-WO3/TiO2 catalyst under different temperatures
图 3 砷中毒前后催化剂的XRD谱图
Figure 3 XRD patterns of the V2O5-WO3/TiO2 catalysts before and after arsenic poisoning for 1000 and 3000h
图 4 砷中毒前后催化剂的孔径分布
Figure 4 Pore size distribution of the V2O5-WO3/TiO2 catalysts before and after arsenic poisoning for 1000 and 3000h
图 5 砷中毒前后催化剂的NH3化学吸附谱图
Figure 5 NH3 chemisorption profiles of the V2O5-WO3/TiO2 catalysts before and after arsenic poisoning for 1000 and 3000h
图 6 砷中毒前后催化剂的傅里叶变换红外光谱谱图
Figure 6 FT-IR profiles of the V2O5-WO3/TiO2 catalysts before and after arsenic poisoning for 1000 and 3000h
图 7 砷中毒前后催化剂X射线光电子能谱谱图
Figure 7 XPS survey spectra of the V2O5-WO3/TiO2 catalysts before and after arsenic poisoning for 1000 and 3000h
图 8 催化剂中As 3d的X射线光电子能谱图
Figure 8 As 3d XPS spectra of the V2O5-WO3/TiO2 catalysts after arsenic poisoning for 1000 and 3000h
图 9 催化剂中V 2p 的X射线光电子能谱谱图
Figure 9 V 2p XPS spectra of the V2O5-WO3/TiO2 catalysts before and after arsenic poisoning for 1000 and 3000h
图 10 SCR催化剂砷中毒机理
Figure 10 Proposed arsenic poisoning mechanism of the V2O5-WO3/TiO2 catalyst for SCR
表 1 砷中毒前后催化剂比表面积、总孔容、平均孔径
Table 1 Textural properties of the V2O5-WO3/TiO2 catalysts before and after arsenic poisoning
Sample BET surface area A/(m2·g-1) Total pore volume v/(cm3·g-1) Average pore diameter d/nm fresh 53.3 0.218 16.36 As 1000h 46.9 0.225 19.19 As 3000h 48.1 0.204 16.97 
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