石油与天然气化工2025，Vol.54Issue(6)：1-10,10.DOI:10.3969/j.issn.1007-3426.2025.06.001
石油催化裂化再生烟气中氮氧化物脱除催化剂性能研究
Study on the performance of catalyst for removing nitrogen oxides from regenerated flue gas of petroleum catalytic cracking
摘要
Abstract
Objective The nitrogen oxides(NOx)in the regenerated flue gas of petroleum catalytic cracking need to be removed by NH3-selective catalytic reduction(NH3-SCR)denitration technology.However,the traditional vanadium-based catalysts exhibit poor low-temperature activity and are prone to poisoning and deactivation due to the influence of SO2,thereby shortening their service life.Therefore,it is necessary to develop denitration catalysts with excellent low-temperature activity and high SO2 poisoning resistance.Method A novel Co-doped Cr2O3/Al2O3 catalyst was prepared,and the effect of Co doping content on the low-temperature activity and SO2 poisoning resistance of the Cr2O3/Al2O3 catalyst was investigated.Result Firstly,catalytic activity test results showed that doping Co could significantly enhance the low-temperature activity of the Cr2O3/Al2O3 catalyst.Among them,the catalyst with a Co doping molar fraction of 20%exhibited the highest activity,which achieved a NOx conversion rate of 90%at 116 °C,along with good SO2 poisoning resistance.Secondly,catalyst characterization results indicated that doping Co into the catalyst increased the number of acidic sites,Cr6+species,and surface-adsorbed oxygen species,thereby improving the selective catalytic reduction(SCR)reaction rate.Conclusion The developed Co-modified Cr-based denitration catalyst can achieve denitration at low-temperature,which is beneficial for the removal of nitrogen oxides in the regenerated flue gas of petroleum catalytic cracking units.关键词
催化裂化/烟气/选择性催化还原/低温脱硝/三氧化二铬/钴改性/抗SO2中毒Key words
catalytic cracking/flue gas/selective catalytic reduction/low-temperature denitration/Cr2O3/Co modification/SO2 poisoning resistance引用本文复制引用
姚宏,宋磊,顾慈兵,刘力,梁斌..石油催化裂化再生烟气中氮氧化物脱除催化剂性能研究[J].石油与天然气化工,2025,54(6):1-10,10.基金项目
四川省科学技术厅项目"富氧空位NH3-SCR催化剂低温深度脱硝研究"(2024NSFSC1152) （2024NSFSC1152）
四川省泸州市科学技术局项目"氨气SCR新型脱硝催化剂技术开发及工业化应用项目"(2024XDY198) （2024XDY198）
