摘要
采用Cr^(3+)、Ni^(2+)、Ba^(2+)离子对NaY分子筛进行单离子或双离子改性处理,并对改性后的CrY、Cr-Ni-Y、Ba-Ni-Y、BaY及NaY分子筛进行了XRD和低温氮气吸附-脱附表征,结果表明改性后分子筛骨架未变,但结晶度都有所降低,降低幅度为CrY>Cr-Ni-Y>Ba-Ni-Y>BaY;各改性分子筛的平均孔径基本未变,CrY的平均孔径最大。分子筛吸附脱除模拟燃料中喹啉的实验结果表明,吸附时间和吸附温度对CrY、Cr-Ni-Y和BaNi-Y分子筛吸附喹啉影响不大,对BaY和NaY分子筛吸附喹啉影响为脱除率先增加之后趋于平衡再降低。分子筛对喹啉的吸附效果依次为CrY>Cr-Ni-Y>Ba-Ni-Y>BaY>NaY,改性提高了分子筛吸附喹啉性能。各分子筛对含碱性氮化物苯胺、吡啶或喹啉模拟燃料的吸附脱氮结果表明,对苯胺的吸附性能均优于吡啶和喹啉,依据分子模拟计算,苯胺N所带的负电荷最大,根据静电作用原理,CrY、Cr-Ni-Y和Ba-Ni-Y对苯胺的吸附作用大于吡啶大于喹啉。BaY和NaY分子筛对碱性氮化物的吸附主要为物理吸附,对苯胺和吡啶的脱除效果接近,优于喹啉。
The NaY molecular sieves,modified by chromium ion,nickel ion and barium ion,were systemically studied.The obtained CrY,Cr-Ni-Y,Ba-Ni-Y,BaY and NaY molecular sieves were characterized respectively by XRD and nitrogen adsorption-desorption.It was indicated that the modified molecular sieve skeleton was unchanged,but the crystallinity decreased and the downward trend was CrY〉Cr-Ni-Y〉Ba-Ni-Y〉BaY.The mean pore sizes of all samples were nearly unchanged and that of CrY was maximum.Removal of quinoline from the model fuel over NaY,CrY,Cr-Ni-Y,Ba-Ni-Y,BaY and NaY molecular sieves showed that the adsorption time and adsorption temperature had little influence on the adsorption of CrY,Cr-Ni-Y and Ba-Ni-Y,for the BaY and NaY molecular sieves,the adsorption capacity of quinoline increased firstly and then balanced and reduced finally.The adsorption effect of the molecular sieves on quinoline was followed by CrY〉Cr-Ni-Y〉Ba-Ni-Y〉BaY〉NaY,the modification improves adsorption performance of the molecular sieves.The adsorption denitrification performance of these molecular sieves for different model diesel containing aniline,pyridine or quinoline was as follows：aniline,pyridine and quinoline.Based on molecular simulation,the charge of N atomin aniline was greater than that of pyridine and quinolone.According to the principle of electrostatic action,the adsorption effect of Cr-Y,Cr-Ni-Y and Ba-Ni-Y on aniline was greater than pyridine and quinoline.The adsorption effect of BaY and NaY molecular sieves on aniline was similar to that of pyridine and was greater than quinoline,the adsorption was mainly physical adsorption.
作者
洪新
李云赫
高畅
赵永华
张丹
唐克
Hong Xin;Li Yunhe;Gao Chang;Zhao Yonghua;Zhang Dan;Tang Ke(School of Chemical and Environmental Engineering, Liaoning University of Technology, Jinzhou 121001, Liaoning, China)
出处
《精细石油化工》
CAS
CSCD
北大核心
2018年第3期20-24,共5页
Speciality Petrochemicals
基金
辽宁省科技厅联合基金(201602380)
广西高校北部湾石油天然气资源有效利用重点实验室2016年度开放课题(2016KLOG04)
关键词
NAY分子筛
改性
离子交换
吸附脱氮
NaY molecular sieve
modification
ion-exchange
adsorptive denitrogenation
