[materials] new material for carbon dioxide capture: capture of CO2 after combustion by MOFs / SiO2 hybrid material

The negative impact and harm of the greenhouse effect caused by the emission of greenhouse gases into the atmosphere on human beings and the natural environment have attracted the attention of governments all over the world CO2 is the most important greenhouse gas Although non carbon energy can be used to reduce CO2 emissions, compared with the reserves and availability of fossil fuels, the cost of renewable energy such as biomass energy, solar energy and wind energy is too high In addition, it is difficult to change the composition of energy system technically Therefore, in the future, the global energy source is still mainly fossil fuels In view of this situation, CO2 capture and storage technology (CCS) will be the most important scheme to stabilize the carbon dioxide concentration in the atmosphere The most important technology is the separation of carbon dioxide At present, the most common separation methods are absorption method, adsorption method, membrane separation method, low temperature distillation method, gas water method, chemical circulation method and combination of several technologies In recent years, metal organic framework materials (MOFs) have achieved great success in the field of gas adsorption and separation Although their adsorption and separation of CO2 are greatly affected by temperature, their porous structure and the physical adsorption of CO2 by metal sites make MOFs have great application prospects in the field of carbon dioxide adsorption and separation Fig 1 Transmission electron micrograph of a new MOF / SiO 2 hybrid material (picture source: chem SCI., 2018, advance article) Recently, Dr Mustapha soukri of the triangle Research Park of the United States prepared a kind of MOF / SiO 2 hybrid material based on polyamines, and explored the influence of various properties of the material on the adsorption performance of CO 2 It is found that MOF / SiO 2 hybrid materials exhibit amazing adsorption capacity and adsorption stability of carbon dioxide through appropriate doping (Zn) zif-8 At the same time, the material has the capacity of large-scale production, so it has great application prospects The results were published in Chemical Science (DOI: 10.1039 / c7sc05372j) Figure 2 Study on the adsorption performance of MOF / SiO 2 hybrid materials for CO 2 (picture source: chem SCI., 2018, First, MOF / SiO 2 hybrid materials were prepared with Cr mil-101 (SO3H) with good chemical and thermal stability as raw materials, and the preparation conditions were optimized according to the standards of TEM, specific surface area and CO 2 adsorption The results showed that the hybrid of the two materials had no significant impact on their physical and chemical properties After that, polyamines were doped into MOF / SiO 2 hybrid materials by different loading methods, and their properties were studied by the same method The results show that the doping rate of MOF / SiO 2 hybrid material is higher than that of pure MOF material Compared with the traditional solution absorption method, loading polyamines into MOF can improve the efficiency of carbon dioxide absorption In addition to immobilizing polyamines on MOF materials, polyamines were doped into MOF materials through the restriction of pores of hybrid materials The materials obtained in this way have higher doping rate of polyamines and higher adsorption capacity of carbon dioxide than those prepared by immobilization Figure 3 Adsorption regeneration curve and cyclic adsorption capacity of hybrid materials (picture source: chem SCI., 2018, advance article) In addition to using (CR) mil-101 (SO3H) as MOF materials, the author also extended this method to other MOF materials to study the influence of MOF composition and load on the performance of hybrid materials The results showed that carboxylic acid neutralized more amines than imidazole, so imidazole MOF materials had better stability By balancing the adsorption capacity of carbon dioxide, recycling, thermal stability and other factors, the author suggests that (Zn) zif-8 / SiO2 is the most suitable for large-scale application Author: Ignacio Luz Mustapha soukrind Marty Laila