镁铝尖晶石基硫转移剂的制备及其性能  

Preparation and Performances of Magnesia-Alumina Spinel Sulfur Transfer Agents

作　　者：高明明[1] 黄洁[1] 许人军 赵欢娟 刘安[1] 李稳宏[1] 

机构地区：[1]西北大学化工学院,陕西西安710069 [2]西安市轻工业研究所,陕西西安710001

出　　处：《石油化工》2015年第5期590-596,共7页Petrochemical Technology

摘　　要：采用等体积浸渍法制备系列Fe2O3-RECl3/Mg Al2O4Mg O(RE为稀土金属),Fe2O3-Ce O2-RECl3/Mg Al2O4·Mg O,Fe2O3-Ce O2-V2O5-RECl3/Mg Al2O4Mg O硫转移剂;利用XRD,FTIR,TG-DTA,XRF等手段对其进行了表征;考察其对FCC再生烟气中SOx的脱硫性能。表征结果显示,负载金属氧化物后未改变镁铝尖晶石的原有晶体结构。实验结果表明,m(Mg Al2O4·Mg O)∶m(Fe2O3)∶m(Ce O2)∶m(V2O5)∶m(RECl3)=1∶0.05∶0.12∶0.015∶0.1的Fe2O3-Ce O2-V2O5-RECl3/Mg Al2O4Mg O硫转移剂(Fe1Ce1V1RE1)对FCC再生烟气中SOx的脱除效果最好;在空速12 s-1条件下,Fe1Ce1V1RE1硫转移剂的脱硫率可达98.72%,SOx穿透时间在100 min以上,硫容可达到1.02 g/g;烟气中氧含量较低时,还原后的Ce3+和V3+不能及时被外界氧气氧化为Ce4+和V5+,影响硫转移剂的循环使用;Fe1Ce1V1RE1硫转移剂具有一定的耐水热老化的能力。A series of sulfur transfer agents, namely Fe2O3-RECl3/MgAl2O4 · MgO （RE： rare earth）, Fe2O3-CeO2-RECl3/MgAl2O4 · MgO and Fe2O3-CeO2-V2O5-RECl3/MgAl2O4 · MgO, for the removal of SOx from FCC regenerated flue gas were prepared by incipient-wetness impregnation, and were characterized by means of XRD, FTIR, TG-DTA and XRF. The results showed that the Fe1Ce1V1RE1 （m （MgAl2O4 · MgO） ： m （Fe2O3） ： m （CeO2） ： m （V2O5） ： m （RECl3） = 1 ： 0.05 ： 0.12 ： 0.015 ： 0.1 ） sulfur transfer agent exhibited the highest activity for the removal of SOx. Under the condition of space velocity 12 s^-1, its maximum desulfurization rate, penetration time and sulfur adsorption capacity could reach 98.72%, more than 100 min and 1.02 g/g, respectively. The influences of oxygen content in the flue gas and hydrothermal treatment on the performances of the sulfur transfer agents were investigated. The results indicated that, when the oxygen content was low, the desulfurization rate and sulfur adsorption capacity significantly reduced, and the reduced Ce^3＋ and V^3＋ could not be oxidized timely into Ce^4＋ and V^5＋, which was unfavorable to the recycling of the sulfur transfer agents. It was showed that the Fe1Ce1V1RE1 sulfur transfer agent had certain resistance to hydrothermal aging.

关 键 词：硫转移剂 镁铝尖晶石 流化催化裂化 再生烟气脱硫 

分 类 号：TQ426.95[化学工程]