Performance of pyrite-catalyzed CO reduction of NO
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摘要: 以黄铁矿作为脱硝催化剂，探究了其催化CO还原NO的性能，并采用XRF、XRD、SEM-EDS及H2-TPR对其表征。结果表明，在400 ℃时，黄铁矿具有78.53%的NO转化率，且在500～800 ℃温度范围内，其NO转化率维持在100%保持不变，在具有优异的NO还原性能的同时还具备极高的N2选择性及良好的CO转化率；黄铁矿在参与催化反应过程中自身分解释放SO2，表面变得粗糙多孔，更有利于NO气体的吸附及还原；黄铁矿中起催化作用的物质为FeS2，其催化CO还原NO的反应遵循Redox反应机理，在反应过程中CO是通过S辅助来还原NO，S的存在更有利于吸附在催化剂表面NO解离的进行，使得黄铁矿表现出极高的催化活性。Abstract: Pyrite was used as denitrification catalyst to investigate the performance in catalytic CO reduction of NO. XRF, XRD, SEM-EDS and H2-TPR are used for characterization. The results showed that the NO conversion for pyrite was 78.53% at 400 ℃ and remained constant at 100% in the temperature range of 500~800 ℃. It shows excellent NO reduction performance and also possesses very high N2 selectivity and good CO conversion. The surface of pyrite becomes rough and porous as it decomposes and releases SO2 during the catalytic reaction. The catalytic substance in pyrite is FeS2, and its catalytic reduction of NO by CO follows the redox reaction mechanism. In the reaction process, CO is assisted by S to reduce NO, and the presence of S facilitates the adsorption and reduction of NO gas on the catalyst surface, making pyrite highly catalytic.
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Key words:
- pyrite /
- catalytic reduction /
- CO /
- NO /
- FeS2
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图 1 脱硝试验装置设备示意
1-气瓶；2-混气箱；3-管式炉；4-气体采样系统；5-红外烟气分析仪；6-气体在线监测系统
Figure 1. Schematic diagram of the denitrification experimental system
图 3 黄铁矿XRD图谱
Figure 3. XRD pattern of pyrite before and after denitrification reaction
图 4 黄铁矿SEM形貌
（a）脱硝反应前 （b）脱硝反应后
Figure 4. SEM image of pyrite before and after denitrification reaction
图 5 黄铁矿EDS能谱
Figure 5. EDS spectrum of pyrite before and after denitrification reaction
图 7 黄铁矿TG-MS图谱
Figure 7. TG-MS for pyrite with the importing of (a) CO first, then NO and (b) NO first, then CO
表 1 黄铁矿元素分析
Table 1. Elemental analysis of pyrite
% Fe S Si Al Ca P Co Ba Cu Cl 其他 50.32 44.48 1.77 1.09 0.72 0.54 0.38 0.3 0.17 0.14 0.09 
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