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摘要: 利用凝胶溶胶法和浸渍法制备了Ce-Fe/Al2O3/cordierite催化剂，实验研究了其催化丙烷选择性还原NO的特性。结果表明，当铈的负载量从1%增加至5%时，Ce-Fe/Al2O3/cordierite的C3H8-SCR性能先增强后减弱，3.5Ce-Fe/Al2O3/cordierite具有最佳的脱硝性能，在有氧条件下，600℃时可实现96.5%的脱硝效率。Ce的加入能够提升Fe/Al2O3/cordierite催化剂的抗硫性能。烟气中通入0.02%的SO2后，3.5Ce-Fe/Al2O3/cordierite催化丙烷还原NO的转化率始终维持在93%，而没有经过Ce修饰的Fe/Al2O3/cordierite的NO转化率从88%下降为80%左右。利用XRD、N2吸附-脱附、SEM、H2-TPR、吡啶吸附红外光谱等手段研究了催化剂的物理化学性质。结果表明，加入助剂铈能与Fe形成了固溶体，增加催化剂表面Lewis酸浓度和氧化还原能力，从而提高了催化丙烷还原NO的性能。过多的铈引入会减少Fe2O3结晶体的形成，不利于在C3H8-SCR反应中形成NO2/NO3-物种，从而导致NO还原效率下降。
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关键词:
- 选择性催化还原 /
- NO /
- Fe/Al2O3/cordierite催化剂 /
- 铈 /
- 丙烷
Abstract: A series of monolithic cordierite-based Ce-Fe/Al2O3 catalysts were prepared by sol-gel and impregnation method. The selective catalytic reduction of NO with C3H8 over the catalysts were experimentally studied. Results indicated that when the addition of cerium increased from 1% to 5%, the C3H8-SCR of Ce-Fe/Al2O3/cordierite increased at first then decreased and 3.5Ce-Fe/Al2O3/cordierite showed the highest C3H8-SCR activity with 96.5% NO reduction in the presence of oxygen at 600℃. Cerium was able to improve the resistance to SO2 in the flue gas for the Fe/Al2O3/cordierite catalysts. When 0.02% SO2 was fed into the flue gas during the test, the NO reduction by 3.5Ce-Fe/Al2O3/cordierite with C3H8 was always kept at about 93%, while the NO reduction by the catalyst without Ce, i.e., Fe/Al2O3/cordierite, decreased from 88% to 80%. The catalysts were characterized using XRD, N2 adsorption-desorption, SEM, H2-TPR and Py-FTIR spectra of adsorbed pyridine. Results showed that the addition of cerium to iron oxide could form the solid solution, which could increase the Lewis acid concentration and redox property of the catalyst, thus improving the performance of catalytic reduction of NO with C3H8. However, the introduction of too much cerium would reduce the crystallinity of iron oxide nanorods, then inhibited the formation of the NO2/NO3- species in the C3H8-SCR reaction, resulting in a decrease in the efficiency of NO reduction.-
Key words:
- selective catalytic reduction /
- NO /
- Fe/Al2O3/cordierite catalyst /
- cerium /
- C3H8
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图 1 实验系统示意图
Figure 1 Experimental setup
1, 2, 3: gas sources; 4: gas regulator; 5: flow meter; 6: ceramic tube; 7: electrically heated furnace; 8: Ce-Fe/Al2O3/cordierite samples; 9: gas analyzer
图 2 N2气氛Ce-Fe/Al2O3/cordierite催化C3H8还原NO的结果
Figure 2 C3H8-SCR results by Ce-Fe/Al2O3/cordierite in N2 atmosphere
(a): NO conversion; (b): C3H8 conversion; (c): N2 yield flow rate 1.5 L/min, φNO=0.05%, φC3H8=0.1%, in N2 base —■—: 1.5Ce-Fe/Al2O3/cordierite; —●—: 2.6Ce-Fe/Al2O3/cordierite; —▲—: 3.5Ce-Fe/Al2O3/cordierite; —▼—: 4.6Ce-Fe/Al2O3/cordierite; : Fe/Al2O3/cordierite
图 3 模拟烟气氛围中Ce-Fe/Al2O3/cordierite催化C3H8还原NO的结果
Figure 3 C3H8-SCR results by Ce-Fe/Al2O3/cordierite in simulated flue gas atmosphere
(a): NO conversion; (b): C3H8 conversion; (c): N2 yield flow rate 1.5 L/min, φNO=0.05%, φC3H8=0.3%, φO2=1.0%, in N2 base —■—: 1.5Ce-Fe/Al2O3/cordierite; —●—: 2.6Ce-Fe/Al2O3/cordierite; —▲—: 3.5Ce-Fe/Al2O3/cordierite; —▼—: 4.6Ce-Fe/Al2O3/cordierite; : Fe/Al2O3/cordierite
图 4 SO2和H2O对Ce-Fe/Al2O3/cordierite催化C3H8还原NO的影响
Figure 4 Effect of SO2 and H2O on C3H8-SCR by Ce-Fe/Al2O3/cordierite (a): SO2; (b): H2O
图 6 Ce-Fe/Al2O3/cordierite催化剂N2吸附-脱附等温线
Figure 6 N2 adsorption-desorption isotherms of nitrogen on Ce-Fe/Al2O3/cordierite
图 8 Ce-Fe/Al2O3/cordierite系列催化剂H2-TPR谱图
Figure 8 H2-TPR profiles of Ce-Fe/Al2O3/cordierite
图 9 Ce-Fe/Al2O3/cordierite催化剂的吡啶吸附红外光谱谱图
(a): Al2O3/cordierite; (b): Fe/Al2O3/cordierite; (c): 3.5Ce-Fe/Al2O3/cordierite; (d): 4.6Ce-Fe/Al2O3/cordierite
Figure 9 Fy-FTIR spectra of pyridine adsorption at different temperatures on Ce-Fe/Al2O3/cordierite
表 1 Ce-Fe/Al2O3/cordierite的孔隙结构特性
Table 1 Textual properties of Ce-Fe/Al2O3/cordierite
Sample Ce wa/ (mg·g-1) ABET/(m2·g-1) vp/(mL·g-1) dp/nm Fe/Al2O3/cordierite 0 26 0.046 7.1 1.5Ce-Fe/Al2O3/cordierite 15.52 25 0.044 7.3 2.6Ce-Fe/Al2O3/cordierite 26.01 24 0.050 8.3 3.5Ce-Fe/Al2O3/cordierite 35.10 23 0.044 7.5 4.6Ce-Fe/Al2O3/cordierite 46.58 20 0.041 7.9 a: analysis result 
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表 2 Ce-Fe/Al2O3/cordierite的表面酸量
Table 2 Concentration of acid sites of Ce-Fe/Al2O3/cordierite catalysts
Sample 170 ℃ 300 ℃ B L B L Al2O3/cordierite 0 0.00204 0 0 Fe/Al2O3/cordierite 0 0.00418 0 0.00190 3.5Ce-Fe/Al2O3/cordierite 0 0.00522 0 0.00335 4.6Ce-Fe/Al2O3/cordierite 0 0.00375 0 0.00225
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