首页|Enhanced adsorption selectivity of 1-hexene/n-hexane mixtures in Cu-BTC metal-organic framework by acid modification
Enhanced adsorption selectivity of 1-hexene/n-hexane mixtures in Cu-BTC metal-organic framework by acid modification
扫码查看
点击上方二维码区域，可以放大扫码查看
原文链接
NSTL
Elsevier
Effective separation of olefins from hydrocarbon mixtures can provide more high-quality feed for steam cracking to produce ethylene and propylene. In this paper, metal organic framework material Cu-BTC (BTC = benzene1,3,5-tricarboxylic acid) was optimally synthesized by solvothermal method and the effects of synthesis condition on the adsorption capacity were investigated. The adsorption capacities of 1-hexene and n-hexane at 298 K were 122.31 mg/g (1.45 mmol/g) and 18.95 mg/g (0.22 mmol/g) respectively, and the selectivity was 6.45. Furthermore, by introducing acetic acid in the synthesis, three acetic groups replace one BTC linker to combined with the Cu paddlewheel clusters in the Cu-BTC skeleton, giving stronger attraction to carbon-carbon double bonds and improving the BET specific surface area, increasing from 859 m(2) g(-1) to 1297 m(2 )g(-1) . The adsorption capacity of 1-hexene was increased. Meanwhile, the adsorption of n-hexane was restrained. When n (H3BTC): n (AcOH) = 1:0.8, the BET specific surface area of the modified Cu-BTC reached 1297 m(2)/g. The adsorption capacity of 1-hexene and n-hexane were 187.90 mg/g (2.23 mmol/g) and 10.75 mg/g (0.12 mmol/g), respectively. The selectivity increased to 17.48. Furthermore, the modified Cu-BTC exhibited excellent performances for the separation of C-7 and C-8 olefin/paraffin mixtures.
NSTL
Elsevier
