Aluminum formate, Al(HCOO)3: An earth-abundant, scalable, and highly selective material for CO2 capture Hayden Evans 1 , Dinesh Mullangi 2 , Zeyu Deng 2 , Yuxiang Wang 3 , Shing Bo Peh 3 , Fengxia Wei 4 , John Wang 2 , Craig M. Brown 1,5 , Dan Zhao 3 , Pieremanuele Canepa 2,3 , Anthony K. Cheetham 2,6 1 Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA. 2 Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117575, Singapore. 3 Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117585, Singapore. 4 Institute of Mate-rials Research and Engineering, Agency for Science Technology and Research, 2 Fusionopolis Way, Innovis, Singapore 138634, Singapore. 5 Department of Chemi-cal and Biomolecular Engineering, University of Delaware, Newark, DE 19716, USA. 6 Materials Research Laboratory, University of California, Santa Barbara, Santa Barbara, CA 93106, USA. A combination of gas adsorption and gas breakthrough measurements show that the metal-organic framework, Al(HCOO) 3 (ALF), which can be made inexpensively from commodity chemicals, exhibits excellent CO 2 adsorption capacities and outstanding CO 2 /N 2 selectivity that enable it to remove CO 2 from dried CO 2 -containing gas streams at elevated temperatures (323 kelvin). Notably, ALF is scalable, readily pelletized, stable to SO2 and NO, and simple to regenerate. Density functional theory calculations and in situ neutron diffraction studies reveal that the preferential adsorption of CO 2 is a size-selective separation that depends on the subtle difference between the kinetic diameters of CO 2 and N2. The findings are supported by additional measurements, including Fourier trans-form infrared spectroscopy, thermogravimetric analysis, and variable temperature powder and single-crystal x-ray diffraction. 1 References 1. Evans, H.A., Mullangi, D., Deng, Z., Wang, Y., Peh, S.B., Wei, F., Wang, J., Brown, C.M., Zhao, D., Canepa, P. and Cheetham, A.K., 2022. Aluminum formate, Al (HCOO) 3: An earth-abundant, scalable, and highly selective material for CO2 capture. Science Advances, 8(44), p.eade1473.
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