Microchannel zeolite 13X adsorbent with high CO2 separation performance

Uniform 13X films with thicknesses of 3 and 11 mu m were grown on supports in the form of steel monoliths with a cell density of 1600 cpsi and microchannels width of 0.5 mm. Sharp breakthrough fronts and a dynamic uptake of 3.4 mmol CO2 g(-1) zeolite were observed in the forwarding step of breakthrough experiments for a feed of 10% CO2 in N-2 with a high flow rate at 293 K and 1 bar. Numerical modeling showed that the adsorption process was very fast and that the transport of CO2 in the thin zeolite layer was the rate-limiting step, the mass transfer resistance for the 11 mu m film is 2.2 times lower than zeolite 13X pellets and 100 times lower than zeolite 4A beads. Axial dispersion, pressure drop, and gas film resistance were shown to be negligible. The steel monolith support provides good mechanical strength and excellent thermal conductivity for the 13X films. The combination of properties makes this adsorbent a good performer when compared with other types of structured zeolite adsorbents in reported literatures. This microchannel adsorbent is a promising alternative to traditional adsorbents in processes of fast CO2 separation with short cycle times.

Automated summary

The study demonstrated that uniform 13X films grown on steel monolith supports showed excellent CO2 adsorption performance, with fast adsorption rate and high mass transfer efficiency. The steel monolith support provided good mechanical strength and thermal conductivity, making this adsorbent a promising alternative for CO2 separation processes.