燃料化学学报2018，Vol.46Issue(3)：298-304,7.
变色硅胶吸附脱除模拟柴油中各种碱性氮化物
Various basic nitrogen compounds removal from model diesel by adsorption with allochroic silica gel
摘要
Abstract
The allochroic silica gel was used for adsorptive denitrification from model diesel containing known amounts of quinoline, aniline or pyridine with a total nitrogen concentration 960. 56 μg/g. The adsorptive removal of quinoline in model diesel with alumina, diatomite, silica gel and allochroic silica gel was investigated. The experiment results indicate that the adsorptive denitrification performance of allochroic silica gel is more superior to that of other three adsorbents,implying that the CoCl2 in allochroic silica gel can significantly improve the performance of denitrification. The silica gel and allochroic silica gel were characterized with X-ray diffraction (XRD),nitrogen adsorption and NH3-TPD. The XRD results indicate that the two samples are of an amorphous structure. Silica gel and allochroic silica gel have the average pore diameter of 18.46 and 1.80 nm, the Brunauer-Emmett-Teller (BET) surface area of 437.86 and 623.39 m2/g, and the pore volume of 0.9724 and 0.3442 m3/g, respectively. The results of NH3-TPD show that the acidity of allochroic silica gel is much stronger than that of silica gel which greatly enhances the adsorptive denitrification. Also, the influence of particle size,adsorption temperature, adsorption time, adsorbent to oil mass ratio and aromatic compounds on the adsorptive denitrification of allochroic silica gel was investigated. The adsorptive denitrification for different model diesels by allochroic silica gel is ordered as:aniline>pyridine>quinoline. Adsorption time has almost no influence on the removal of three nitrogen compounds. Adsorption temperature, particle size and aromatic compounds in the model diesel have little impact on the removal of aniline and pyridine, but have evident influences on the removal of quinoline. The adsorbent to oil ratio has a significant effect on the adsorptive denitrification,especially for quinoline. The experimental results suggest that the N-Co bond between Co in allochroic silica gel and N atom in the nitrogen compounds plays a significant role. Furthermore, the allochroic silica gel could be easily regenerated to recover its adsorptive denitrification for quinoline and pyridine by calcination once or several times,but except aniline.关键词
变色硅胶/模拟柴油/碱性氮化物/吸附脱氮Key words
allochroic silica gel/model diesel/basic nitrogen compounds/adsorptive denitrification分类
化学引用本文复制引用
洪新,李云赫,袁加成,赵永华,唐克..变色硅胶吸附脱除模拟柴油中各种碱性氮化物[J].燃料化学学报,2018,46(3):298-304,7.基金项目
The project was supported by the Liaoning Provincial Natural Science Foundation of China(2014020113)and Guangxi Colleges and Universities Key Laboratory of Beibu Gulf Oil and Natural Gas Resource Effective Utilization(2016KLOG04).辽宁省自然科学基金(2014020113)和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)项目资助 （2014020113）
