| 摘要: |
| 石油催化裂化（FCC）再生烟气中氮氧化物（NOx）需要采用氨气选择性催化还原（NH3-SCR）脱除，而传统的钒基催化剂低温活性差，易受SO2毒害而减少使用寿命，需要开发低温高抗硫的脱硝催化剂。本文制备了新型的Co掺杂的Cr2O3/Al2O3催化剂，研究了Co的掺杂量对Cr2O3/Al2O3催化剂的低温活性及抗硫中毒能力影响。 催化剂活性测试表明，Co掺杂可以显著提升Cr2O3/Al2O3催化剂的低温活性，其中Co掺杂量摩尔比为20%的催化剂表现了最好的活性，在116℃时NOx转化率达到了90%，同时催化剂展现了较好的抗硫能力。催化剂表征结果表明，Co掺杂到催化剂上会增加酸位点数目、Cr6+和表面吸附氧物种数目，从而加快SCR反应。本文开发的Co修饰的Cr基脱硝催化剂实现了低温抗硫脱硝，对于FCC再生烟气中氮氧化物的脱除具有重要的意义。 |
| 关键词: 氨气选择性催化还原 石化行业脱硝 氧化铬 钴改性 抗硫 |
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| 基金项目:四川省科技厅项目 “富氧空位NH3-SCR催化剂低温深度脱硝研究”( 2024NSFSC1152)；泸州市科技局项目“氨气SCR新型脱硝催化剂技术开发及工业化应用项目”( 2024XDY198)； |
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| Effect of Co doping on low temperature denitrification properties of Cr2O3/ Al2O3 catalysts |
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Yao Hong1, Song Lei1, Gu Cibing2, Liu Li2, Liang Bin1
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1.Sichuan University;2.Sichuan Lutianhua Co., Ltd.
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| Abstract: |
| Nitrogen oxides (NOx) in the regeneration flue gas of petroleum catalytic cracking (FCC) need to be removed by ammonia selective catalytic reduction (NH3-SCR), while the traditional vanadium-based catalyst has poor low-temperature activity and is easily poisoned by SO2, which reduces its service life. It is necessary to develop a low-temperature and highly sulfur-resistant denitrification catalyst. In this paper, a new Co-doped Cr2O3/Al2O3 catalyst was prepared, and the effect of the Co doping amount on the low-temperature activity and sulfur poisoning resistance of the Cr2O3/Al2O3 catalyst was studied. The catalyst activity test showed that Co doping can significantly improve the low-temperature activity of the Cr2O3/Al2O3 catalyst, among which the catalyst with a Co doping amount of 20% molar ratio showed the best activity, with a NOx conversion rate of 90% at 116℃, and the catalyst showed good sulfur resistance. The catalyst characterization results showed that Co doping on the catalyst would increase the number of acid sites, Cr6+ and the number of surface adsorbed oxygen species, thereby accelerating the SCR reaction. The Co-modified Cr-based denitrification catalyst developed in this paper achieves low-temperature sulfur-resistant denitrification, which is of great significance for the removal of nitrogen oxides in FCC regeneration flue gas. |
| Key words: NH3-SCR, Cr2O3, Denitrification in petrochemical industry, Co modification, Anti-SO2 |
