化工学报2016，Vol.5Issue(5)：1942-1948,7.DOI:10.11949/j.issn.0438-1157.20151519
温度对MOF-74(Ni)吸附分离丙烯丙烷机理和选择性的影响
Effects of temperature on adsorption mechanism and adsorption selectivity of C3H6 and C3H8 on MOF-74(Ni)
摘要
Abstract
MOF-74(Ni) was synthesized by solvothermal synthesis method and then characterized by PXRD and pore size analysis. Isotherms of C3H6 and C3H8 on the synthesized MOF-74(Ni) were measured at different temperatures. The temperature programmed desorption experiments were conducted to estimate the desorption activation energies of C3H6 and C3H8 on the MOF-74(Ni). IAST theory was applied to predict the adsorption selectivity of C3H6/C3H8 mixture. The effects of temperature on adsorption mechanism and adsorption selectivity were also discussed. Results showed that the as-synthesized MOF-74(Ni) had BET surfaces of 1306 m2·g?1, and its C3H6 adsorption capacity was up to 7.4 mmol·g?1 at 298 K. With rising temperature, the adsorption capacity of C3H8 on MIL-74(Ni) decreased sharply, while that of C3H6 decreased slightly, resulting in improvement of C3H6/C3H8 adsorption selectivity of MOF-74(Ni). It could be attributed to π-complexation bonding between C3H6 and MOF-74(Ni), which was stronger than the interaction of C3H8 with MOF-74(Ni). TPD results indicated that the desorption activation energy of C3H6 on MOF-74(Ni) was higher than that of C3H8, which were 68.92 kJ·mol?1 and 50.80 kJ·mol?1 , respectively.关键词
MOF-74(Ni)/丙烯/丙烷/吸附等温线/吸附选择性/温度Key words
MOF-74(Ni)/propylene/propane/adsorption isotherms/adsorption selectivity/temperature分类
化学化工引用本文复制引用
刘江,吴玉芳,许峰,肖静,夏启斌,李忠..温度对MOF-74(Ni)吸附分离丙烯丙烷机理和选择性的影响[J].化工学报,2016,5(5):1942-1948,7.基金项目
国家自然科学基金重点项目(21436005).supported by the Key Program of the National Natural Science Foundation of China(21436005). （21436005）
