| As a current widely used separation technology,adsorption is not only used in the chemical and pharmaceutical industries,but also plays an important role in energy and environmental science.The preparation of an adsorbent capable of efficiently separating the target product from the mixture is one of the core applications of the current adsorption separation technology,?-complex adsorbent satisfies the demand of adsorbents in the current industry,and has been well applied in the fields of gas separation,purification and environmental protection.The purpose of this paper is to prepare a novel?-complex adsorbent based on Metal-Organic Frameworks?MOFs?and apply it to the adsorption and separation of CO from mixed gases,and to approximate the relative molecular mass.C2H4 was adsorbed and separated in C2H4/C2H6.?1?.MIL-101?Materials of Institut Lavoisier?is a synthetic method with high adsorption performance and high thermal stability of MOFs,which can be used as a good carrier for the preparation of complex adsorbents.In this paper,three experimental methods were used to introduce the active substance Cu+into the pores of the carrier to achieve good dispersion of the active material.First,by hydrothermal synthesis of MIL-101,Cu?NO3?2·3H2O and CoCl2·6H2O were introduced into MIL-101 by a double-solvent method to prepare an adsorbents Cu/Co@MIL-101-DS by impregnation method.Cu/Co@MIL-101-WI and Cu/Co@MIL-101-SG were prepared by solid phase grinding thermal dispersion.?2?.We studied the CO adsorption performance of different contents of Cu/Co@MIL-101-DS from CO,CO2,H2 and N2 mixed gas.The H2,N2 and CO adsorption amounts of pure MIL-101 at 25°C and 101 kPa are 0.9 cm3·g-1,5.2 cm3·g-11 and 12.1 cm3·g-1,respectively.The CO adsorption capacity of 2.0Cu/2.0Co@MIL-101-DS reached up to 34.1 cm3·g-1,and the adsorption capacities for H2 and N2 were 2.9 cm3·g-1 and 1.8 cm3·g-1,respectively.We also studied 2.0Cu/2.0Co@MIL-101 prepared by different methods.Compared with2.0Cu/2.0Co@MIL-101-SG,the sample 2.0Cu/2.0Co@MIL-101-WI has a slightly stronger adsorption capacity for CO,however,the samples synthesized by the two methods are lower than the samples prepared by the double solvent.The results show that the adsorbent based on MIL-101 modified by two precursors and double solvent at 250°C for 5 h under argon atmosphere has the highest adsorption performance for CO.?3?.We also used MIL-101 as a carrier to prepare a complex adsorbent with Cu?NO3?2·3H2O and CoCl2·6H2O to study its adsorption and separation performance for C2H4/C2H6.The results show that the adsorbents of the single metal salt active materials1.5Cu@MIL-101-DS and 1.5Co@MIL-101-DS have almost no separation performance for C2H4/C2H6,while 1.5Cu/1.5Co@MIL-101-DS containing bimetallic active substances has the best separation effect on C2H4/C2H6.The C2H4 adsorption amount of which is 50.5 cm3·g-1,while the C2H6 adsorption amount is only 33.2 cm3·g-1. |
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