The development of materials with high adsorption of carbon dioxide at low relative pressure and ambient temperature has been a significant challenge to materials chemistry. Physical adsorption of carbon dioxide is an emergent technology. This system may replace the currently used processes, such as chemical adsorption by a bed of amine, which are costly to operate. Microporous coordination polymers (MCPs) offer advantages as high surface area materials, as well as ease of synthesis, flexibility in functionalization and alteration, and characterization due to crystallinity. Despite their effectiveness in CO2 uptake, currently known MCPs are comparable to 13X zeolite in low pressure CO2 uptake at room temperature and there remains a great need for higher affinity CO2 uptake materials and especially those that function well below one bar.
Researchers at the University of Michigan have developed MCPs with exceptionally high affinity CO2. These materials include MCPs containing Co, Ni, Mg, and/or Zn and an organic linker, and possess exceptional uptake of CO2 at low relative pressures and ambient temperatures. In addition they may be used to separate olefin/paraffin, and show good selectivities for olefin compounds over paraffin compounds. Specifically, these MCPs are useful in the chemical separation of unsaturated molecules from saturated molecules, and in particular olefins from paraffins; ethylene and ethane, as well as propylene and propane can be separated using these MCPs.
Applications and Advantages
- Sorbent for gas separation.
- Exceptional uptake of CO2 at low relative pressures and ambient temperatures, enhancing adsorption process.