镁铝尖晶石基硫转移剂的制备及其性能.pdf

油化
PETROCHEMICAL TECHNOLOGY
2015年第44卷第5期
镁铝尖晶石基硫转移剂的制备及其性能
高明明',黄洁,许人军2,赵欢娟,刘安,李稳宏
(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)
摘要]采用等体积浸渍法制备系列Fe2O3-REC1MgA12O4?MgO(RE为稀上金属),Fe2O、-CeO2- RECL]/MgA1O4MgO
FeO3-CeO2-V2O、- RECI2/Mga12O4'MgO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SO2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(Mga, o, Mgo): m(Fe, O ) m(Ceo): m (V ) m(RECL, )=1: 0.05: 0.12: 0.015: 0.1M0 Fe2o Ceo -RECL/
Mga
MgO硫转移剂( Fe, Ce, V,RE1)对FC再生烟气中SO的脱除效果最好;在空速12s'条件下,FeCe1VRE硫转移剂的
脱硫率可达98.72%,SO穿透时向在100min以上,硫容可达到1.02g/g;烟气中氧含量较低时,还原后的Ce'和V不能及时被
外界氧气氧化为Ce“和V,影响硫转移剂的循环使用; Fe, Ce, VRE硫转移剂具有一定的耐水热老化的能力
关键词]硫转移剂;镁铝尖晶石;流化催化裂化;再生烟气脱硫
文章编号1000-8144(2015)05-0590-07
中图分类号」TQ426.95
文獻标志码]A
Preparation and Performances of Magnesia-alumina Spinel Sulfur Transter Agents
Gao Mingming Huang Jie Xu Ren un, Zhao Huanjuan, Liu An, Li Wenhong
(1. School of Chemical Engineering, Northwest University, Xi an Shaanxi 710069, China
2. Xi an Institute of Light Industry, Xi'an Shaanxi 710001, China)
I Abstract] A series of sulfur transfer agents, namely Fe,O, -RECL /Mga1,O]. Mgo(RE
rare carth), Fe, O -Ceo -RECL /M Al O Mgo and Fe2 -CE02-V2O RECL /Mgal2o. Mgo, for
the removal of SO, 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 Fe, Ce, V,RE,(m(Mgal,O Mgo): m(Fe,0): m(Ce0): m(V,; ) m(RECL
1: 0.05: 0.12: 0.015: 0.1 sulfur transfer agent exhibited the highest activity for the removal of
SO,. Under the condition of space velocity 12 s, 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"and V " could not be oxidized timely into Ce"and V., which was unfavorable to the recycling
of the sulfur transfer agents. It was showed that the Fe, Ce, V, RE sulfur transfer agent had certai
resistance to hydrothermal aging
I Keywords J sulfur transfer agents; magnesia-alumina spinel; fluidized catalytic cracking;
desulfurization of regenerated flue gas
炼厂排放的SO、占大气总SO,排放量的法规的不断严格,因此对FCC再生烟气中SO的脱
6%~7%,其中,FCC过程排放的SO占大气总SO2排除就显得尤为重要。
放的5%左右,占炼厂sO排放量的70%~80%1-3
使用硫转移剂脱除FCC再生烟气中的SO,无
排放的SO易造成环境污染和设备腐蚀,加之环保需新增设备、操作费用低、可循环利用,由SO转
收稿日期]2014-11-25;[修改稿日期]2015-01-30
作者简介]高明明(1990-),男,陕西省延安市人,硕士生,电话15877447132,电邮904383255qq.com。联系人:黄洁,电邮
huangjie(@nwu.edu.cn