New composite MOF traps oxygen selectively; potential use for energy applications such as fuel cells
A research team has created a composite of a MOF and a helper molecule in which the two work in concert to separate oxygen from other gases simply and cheaply. The results, reported in Advanced Materials, might help with a wide variety of applications, including making pure oxygen for fuel cells, using that oxygen in a fuel cell, removing oxygen in food packaging, making oxygen sensors, or for other industrial processes. The technique might also be used with gases other than oxygen as well by switching out the helper molecule.
Currently, industry uses a common process called cryogenic distillation to separate oxygen from other gases. It is costly and uses a lot of energy to chill gases. Also, it can’t be used for specialty applications like sensors or getting the last bit of oxygen out of food packaging.
A great oxygen separator would be easy to prepare and use, be inexpensive and be reusable. MOFs, or metal-organic frameworks, are materials containing lots of pores that can suck up gases like sponges suck up water. They have potential in nuclear fuel separation and in lightweight dehumidifiers.
But of the thousands of MOFs out there, less than a handful absorb molecular oxygen. And those MOFs chemically react with oxygen, forming oxides that render the material unusable.
When we first worked with MOFs for oxygen separation, we could only use the MOFs a few times. We thought maybe there’s a better way to do it.—PNNL materials scientist Praveen Thallapally
The new tack for Thallapally and colleagues at PNNL involved using a second molecule to mediate the oxygen separation—a helper molecule would be attracted to but chemically uninterested in the MOF. Instead, the helper would react with oxygen to separate it from other gases.
They chose a MOF called MIL-101 that is known for its high surface area and lack of reactivity.
MOFs that react with oxygen need to be handled carefully in the laboratory, but MIL-101 is stable at ambient temperatures and in the open atmosphere of a lab. For their helper molecule, they tried ferrocene, an inexpensive iron-containing molecule.
The scientists made a composite of MIL-101 and ferrocene by mixing them and heating them up. Initial tests showed that MIL-101 took up more than its weight in ferrocene and at the same time lost surface area. This indicated that ferrocene was taking up space within the MOF’s pores, where they need to be to snag the oxygen.
Then the team sent gases through the black composite material. The material bound up a large percentage of oxygen, but almost none of the added nitrogen, argon or carbon dioxide. The material behaved this way whether the gases went through individually or as a mix, showing that the composite could in fact separate oxygen from the others.
Additional analysis showed that heating caused ferrocene to decompose in the pores to nanometer-sized clusters, which made iron available to react with oxygen. This reaction formed a stable mineral known as maghemite, all within the MOF pores. Maghemite could be removed from the MOF to use the MOF again.
Future research will explore other combinations of MOF and helper molecules.
In addition to PNNL, participating researchers were from and used analytical instruments at two Office of Science User Facilities, the Environmental Molecular Sciences Laboratory at PNNL and the Advanced Photon Source at Argonne National Laboratory, as well as the University of Amsterdam. This work was supported by the Department of Energy Office of Science.
Zhang, W., Banerjee, D., Liu, J., Schaef, H. T., Crum, J. V., Fernandez, C. A., Kukkadapu, R. K., Nie, Z., Nune, S. K., Motkuri, R. K., Chapman, K. W., Engelhard, M. H., Hayes, J. C., Silvers, K. L., Krishna, R., McGrail, B. P., Liu, J. and Thallapally, P. K. (2016), Redox-Active Metal–Organic Composites for Highly Selective Oxygen Separation Applications. Adv. Mater. doi: 10.1002/adma.201600259