Synthesis Of Novel DOBDC@MIL-100?Fe? And MIL-100?Fe,Co? And Their CO₂/N₂ Adsorption Selectivity

The international community is facing serious energy crisis,one of the most effective measues to solve this problem is energy conservation.Under the background of huge industry demand for Alkane Alkene separation and CO₂ adsorption separation,this research focused on MIL-100?Fe??DOBDC@MIL-100?Fe?and MIL-100?Fe,Co?,their adsorption performance of Alkane,Alkene and CO₂ was measured,and their adsorption mechanism was discussed.This study has value of theoretical and practical significance.The C₂H₄/C₂H₆ and C₃H6/C₃H8 adsorption isotherms of MIL-100?Fe?at different temperatures were tested,results showed that the olefins were preferentially adsorbed through ? bond,the adsorption capacities of MIL-100?Fe?for olefins were up to 3.02 mmol/g for ethylene and 7.54 mmol/g for propylene at 1bar and 298 K.The C₂H₄/C₂H₆ and C₃H6/C₃H8 IAST selectivities of MIL-100?Fe?at 1kPa and 298 K reached as high as 111 and 70,and the isoteric heats of olefin adsorption were much higher than that of paraffin under low pressure.A novel DOBDC@MIL-100?Fe?was first successful y synthesized.1#DOBDC@MIL-100?Fe?presents the largest BET specific surface area of 2437 m2 /g?CO₂-TPD and computer simulation exhibit that DOBDC@MIL-100?Fe?has two kinds of CO₂ adsorption sites.DOBDC@MIL-100?Fe?presents excel ent thermal stability and moisture stability.CO₂ uptake of 1#DOBDC@MIL-100?Fe?reaches 3.63 mmol/g at 298 K and 1 bar,increasing 62% compared to MIL-100?Fe?.The CO₂/N₂ selectivity of 1#DOBDC@MIL-100?Fe?reaches up to 50 at 100 KPa,being 8 times of that of MIL-100?Fe?.A novel Bimetal ic MIL-100?Fe,Co?was first successful y synthesized.2#MIL-100?Fe,Co?presents the largest BET specific surface area of 2372 m2 /g.AAS shows two metal elements?Co,Fe?are dispersed in the crystals of 2#MIL-100?Fe,Co?.FTIR exhibits Co²⁺ have successful y coordinated with the carboxylic group in BTC through Co–O.MIL-100?Fe,Co?presents excel ent thermal stability and moisture stability.CO₂ uptake of 2#MIL-100?Fe,Co?reaches 3.27 mmol/g at 298 K and 1 bar,increasing 45.4% compared to MIL-100?Fe?.The CO₂/N₂ selectivity of 2#MIL-100?Fe,Co?reaches up to 40 at 100 KPa,being 6.7 times of that of MIL-100?Fe?.