金属有机骨架MIL-101对焦化蜡油中碱氮的吸附

Adsorptive denitrogenation of coker gas oil on MIL-101 with metallic organic framework

采用水热合成法制备了金属有机骨架MIL-101,并用于对焦化蜡油(CGO)的吸附脱氮。采用XRD、SEM、FTIR和N_2吸附-脱附等技术对MIL-101试样进行了表征。考察了吸附剂加入量、吸附时间、吸附温度等条件对吸附剂性能的影响。表征结果显示,合成的MIL-101具有粒径为250~300 nm的正八面体结构,比表面积为3 248 m^2/g,孔体积为1.65 cm^3/g,并由两种介孔结构组成。实验结果表明,MIL-101经活化处理后可去除孔道内部残留的对苯二甲酸,并显著提升其吸附性能;在吸附剂用量为0.75 g、吸附温度为120℃、吸附时间为1 h时,吸附过程达到平衡,CGO的碱氮含量(w)由1.441×10^(-3)降至0.396×10^(-3),脱氮率达72.5%。

MIL-101 with metallic organic framework was synthesized by a hydrothermal method and characterized by means of XRD,SEM,FTIR and N2 adsorption-desorption. It was used in the denitrogenation of coker gas oil（CGO）. The characterization results indicated the octahedron structure of MIL-101 with particle diameter of 250-300 nm,BET specific surface area of 3 248 m2/g and total pore volume of 1.65 cm3/g. It was showed that there were two types of mesopores on MIL-101. The adsorbility of MIL-101 could be enhanced by activation which might remove residual terephthalic acid in the pores. Under the optimized conditions of 120℃,1 h,0.75 g MIL-101 as the absorbent and CGO dosage 10 g,the content of the basic nitrogen compounds in CGO was decreased from 1.441×10^-3（w） to 0.396×10^-3（w） with a denitrogenation rate of 72.5%.