镧负载方式对Y分子筛抗钒性能的影响  

EFFECT OF LOADING MODE OF La ON VANADIUM RESISTANCE PERFORMANCE OF Y ZEOLITE

作　　者：吕鹏刚 赵鸣芝 刘涛 段宏昌 王漫云 曹庚振 赵连鸿 王为民 周明慧[2] LüPenggang;Zhao Mingzhi;Liu Tao;Duan Hongchang;Wang Manyun;Cao Gengzhen;Zhao Lianhong;Wang Weimin;Zhou Minghui(Lanzhou Petrochemical Research Center,Petrochemical Research Institute,PetroChina,Lanzhou 730060;PetroChina Sichuan Petrochemical Co.,Ltd.)

机构地区：[1]中国石油石油化工研究院兰州化工研究中心,兰州730060 [2]中国石油四川石化有限责任公司

出　　处：《石油炼制与化工》2024年第6期61-65,共5页Petroleum Processing and Petrochemicals

基　　金：中国石油天然气股份有限公司重大现场工业试验项目(2021ZS12,23-LH-51-01)。

摘　　要：分别采用不同方式在Y分子筛上负载相同量的稀土元素镧(La),制备得到了Y2、Y3、Y4分子筛样品,系统考察了La引入方式对Y分子筛理化性质和微反活性的影响。结果表明:在采用浸渍法负载La得到的Y2分子筛中,La以离子态存在,且在焙烧过程中La离子更易于迁移到分子筛内部结构中,并更多进入分子筛的α笼;在采用沉淀法负载La得到的Y3和Y4分子筛中,La以非离子态存在,且在焙烧过程中La物种较少向分子筛内部迁移,更多存在于分子筛表面上;与Y2分子筛相比,采用La与草酸先沉淀后负载到分子筛上的方式制备的Y3分子筛具有更好的水热稳定性和微反活性,说明赋存在分子筛表面上的La可以更好地改善分子筛的抗钒性能。Y2,Y3 and Y4 zeolite samples were prepared by loading the same content of rare earth La into Y zeolite via different methods,and the physicochemical properties and microactivity of Y zeolite samples were investigated systematically.The results showed that the La existed in ionic state in Y2 zeolite prepared by impregnation method,the La ions migrated into the internal structure of zeolites more easily during calcination,and most of them entered into theα-type supercage of zeolites;in the Y3 and Y4 zeolites prepared by precipitation method,La existed in non-ionic state and migrated less into the internal structure of zeolites during calcination.Compared with Y2 zeolite prepared by impregnation method,Y3 zeolite prepared by precipitation of La and oxalic acid first and then loading on the zeolite had better hydrothermal stability and activity,which indicated that the La present on the surface could improve the vanadium resistance of Y zeolite.

关 键 词：Y分子筛 钒污染 LA 沉淀法 

分 类 号：TE624.91[石油与天然气工程—油气加工工程]