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www.nature.com/scientificreports/ Figure 11. Catalytic recyclability test for successive five runs of styrene oxide. Reaction conditions: styrene oxide (5 mmol), DBU (4 mol %), Cu-ABF@ASMNPs (50 mg), 80 °C, 12 h, 1 atm of CO2. Figure 12. Plausible mechanism for the Cu-ABF@ASMNPs catalysed cycloaddition reaction of epoxide and CO2. occurred at relatively short reaction time. Additionally, this simple methodology may serve as a benign alter- native for conversion of CO2 and reusability of the catalyst up to five runs makes it favourable from the stand- point of environmental protection and resource utilization. This work might enlighten a promising strategy to construct efficient novel nanocatalyst for fixation of CO2 as renewable and environmentally friendly source of carbon in future. References 1. Olah, G. A., Goeppert, A. & Prakash, G. S. Chemical recycling of carbon dioxide to methanol and dimethyl ether: from greenhouse gas to renewable, environmentally carbon neutral fuels and synthetic hydrocarbons. J. Org. Chem. 74, 487–498 (2008). 2. Canadell, J. G. et al. Contributions to accelerating atmospheric CO2 growth from economic activity, carbon intensity, and efficiency of natural sinks. Proc. Natl. Acad. Sci. 104, 18866–18870 (2007). 3. Kenarsari, S. D. et al. Review of recent advances in carbon dioxide separation and capture. RSC Adv. 3, 22739–22773 (2013). 4. Gurkan, B. E. et al. Equimolar CO2 absorption by anion-functionalized ionic liquids. J. Am. Chem. Soc. 132, 2116–2117 (2010). 5. Markewitz, P. et al. Worldwide innovations in the development of carbon capture technologies and the utilization of CO2. Energy Environ. Sci. 5, 7281–7305 (2012). 6. Xiaoding, X. & Moulijn, J. Mitigation of CO2 by chemical conversion: plausible chemical reactions and promising products. Energy Fuels 10, 305–325 (1996). 7. Tlili, A., Frogneux, X., Blondiaux, E. & Cantat, T. Creating added value with a waste: methylation of amines with CO2 and H2. Angew. Chem., Int. Ed. 53, 2543–2545 (2014). 8. Mikkelsen, M., Jørgensen, M. & Krebs, F. C. The teraton challenge. A review of fixation and transformation of carbon dioxide. Energy Environ. Sci. 3, 43–81 (2010). 9. Aresta, M., Dibenedetto, A. & Angelini, A. Catalysis for the valorization of exhaust carbon: from CO2 to chemicals, materials, and fuels. Technological use of CO2. Chem. Rev. 114, 1709–1742 (2013). 10. Cokoja, M., Bruckmeier, C., Rieger, B., Herrmann, W. A. & Kühn, F. E. Transformation of carbon dioxide with homogeneous transition‐metal catalysts: a molecular solution to a global challenge? Angew. Chem., Int. Ed. 50, 8510–8537 (2011). 11. Visconti, C. G. et al. Fischer–Tropsch synthesis on a Co/Al2O3 catalyst with CO2 containing syngas. Appl. Catal., A 355, 61–68 (2009). 12. Liu, Q., Wu, L., Jackstell, R. & Beller, M. Using carbon dioxide as a building block in organic synthesis. Nat. Commun. 6, 5933 (2015). SCientifiC RepoRts | (2018) 8:1901 | DOI:10.1038/s41598-018-19551-3 9PDF Image | copper-based magnetic nanocatalyst for the fixation of carbon dioxide
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