Chin.J.Chem.Eng. ›› 2018, Vol. 26 ›› Issue (5): 1012-1021.doi: 10.1016/j.cjche.2017.11.007

• Separation Science and Engineering • Previous Articles     Next Articles

Water-stable ZIF-300/Ultrason® mixed-matrix membranes for selective CO2 capture from humid post combustion flue gas

Muhammad Sarfraz1, M. Ba-Shammakh2   

  1. 1 Department of Polymer and Process Engineering, University of Engineering and Technology, Lahore 54890, Pakistan;
    2 Department of Chemical Engineering, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
  • Received:2017-07-25 Revised:2017-11-01 Online:2018-05-28 Published:2018-06-29
  • Contact: Muhammad Sarfraz,E-mail

Abstract: Water stable mixed-matrix membranes (MMMs) were developed to help control the global warming by capturing and sequestrating carbon dioxide (CO2) from post-combustion flue gas originated from burning of fossil fuels. MMMs of different compositions were prepared by doping glassy polymer Ultrason® S 6010 (US) with nanocrystals of zeolitic imidazolate frameworks (ZIF-300) in varying degrees. Solution-casting technique was used to fabricate various MMMs to optimize their CO2 capturing performance from both dry and wet gases. The prepared composite membranes indicated enhanced filler-polymer interfacial adhesion, consistent distribution of nanofiller, and thermally established matrix configuration. CO2 permeability of the membranes was enhanced as demonstrated by gas sorption and permeation experiments performed under both dry and wet conditions. As compared to neat Ultrason® membrane, CO2 permeability of the composite membrane doped with 40 wt% ZIF-300 nanocrystals was increased by four times without disturbing CO2/N2 ideal selectivity. In contrast to majority of previously reported membranes, key features of the fabricated MMMs include their structural stability under humid conditions coupled with better and unaffected gas separation performance.

Key words: Hydrophobic MMMs, ZIF-300, Gas permeation, CO2 capture, Permselectivity