铜铈改性镁铝尖晶石作为助催化剂同时脱除FCC烟气中的SO_x,NO_x  

CuO,CeO_2 modified Mg-Al spinel as additives for removal of SO_x and NO_x from FCC flue gas

作　　者：皮志鹏 沈本贤[1] 刘纪昌[1] 刘逸锋 赵基钢[1] 

机构地区：[1]华东理工大学化工学院石油加工研究所,上海200237

出　　处：《化工进展》2016年第10期3190-3195,共6页Chemical Industry and Engineering Progress

摘　　要：为降低催化裂化烟气中的SOx、NOx,采用溶胶凝胶法合成了Mg-Al尖晶石,并通过共胶法进行金属氧化物改性制备得到催化裂化烟气脱硫脱硝助催化剂。在小型固定床反应装置上考察了铜铈改性以及烟气中O2含量对尖晶石脱硫脱硝性能的影响,并在小型提升管装置上考察了铜铈复合改性后尖晶石同时脱硫脱硝的性能。结果表明:经铜铈复合改性后的尖晶石脱硫活性最高,40min内仍能保持90.67%的SO2脱除率;含铜尖晶石的脱硝性能最优,450℃后NO转化率达100%。烟气中O2含量对脱硫有利而对脱硝不利,当O2含量过高时,NO不能有效脱除。原位红外漫反射分析表明:含铜尖晶石良好的脱硝性能是因为其含有的Cu+对CO优异的吸附性能,O2的影响在于其与CO的反应,导致CO消耗。提升管装置评价实验结果表明:主风量为0.6m3/h时,Cu Ce-Mg Al脱硫效率为59.96%,脱硝效率为87.63%。当主风量为0.8m3/h时,脱硫效果提升至74.50%而失去了脱硝功能。Mg-Al spinel was synthetized by Sol-Gel method and modified with Cu O and Ce O2 via co-gelling method,and was further used to remove SOx and NOx from FCC flue gas. The synthetized catalysts were evaluated on a fixed bed reactor and a lab-scale riser fluid catalytic cracking unit by investigating the influence of metal oxides and O2 content. After modified by Cu O and Ce O2,Mg-Al spinel kept a desulfurization rate of 90.67% after 40 minutes. Cu-containing spinel showed the best NO removal efficiency,and the NO conversion was 100% when the temperature was over 450℃. O2 was favorable to desulfurization but unfavorable to denitrification. DRIFTS analysis indicated that the excellent adsorption of CO on Cu＋ was the reason for high denitrification efficiency of Cu-containing spinel. Lab-scale riser FCC unit evaluation showed that when the flow of air into the regenerator was 0.6m^3/h,Cu Ce-Mg Al showed a desulfurization rate of 59.96% and a denitrification rate of 87.63%;when the air flow was 0.8m^3/h,desulfurization rate increased to 74.50% but the denitrification disappeared.

关 键 词：烟气 脱硫 脱硝 尖晶石 改性 

分 类 号：TE991.1[石油与天然气工程—石油机械设备]