CO2 separation from binary mixtures of CH4, N2, and H2 by using SSZ-13 zeolite membrane

Due to the importance of gas mixture composition in CO2 separation process and the lack of sufficient studies in the literatures for SSZ-13 zeolite membrane, in this paper, the effect of various mixed gas compositions was investigated in CO2 separation from light gases like CH4, N-2, and H-2 by using a synthesized SSZ-13 zeolite membrane. Single gas permeance was measured for CO2, N-2, CH4 and H-2 in a wide range of temperature (30-80 degrees C), feed pressure (up to 600 kPa) and different feed composition for gas mixtures (25:75, 50:50, 75:25). The results of single gas showed really good performance, i.e., CO2 permeance of 7.34 x 10(-7) mol m(-2) s(-1) Pa-1 and CO2/CH4 selectivity of 60 at 30 degrees C and 200 kPa of feed pressure. For equimolar mixed gas, the CO2 permeance was almost the same for single gas while the CH4 permeance was reduced by 75% and hence CO2/CH4 selectivity was increased by three times, i.e., from 60 to 183. Similarly, the selectivity of CO2/N-2 and CO2/H-2 were doubled and increased by more than 5 times, respectively. For other compositions (25:75, 75:25) the CO2/CH4, CO2/N-2 and CO2/H-2 mixture selectivity were decreased with increase in CO2 concentration of feed keeping always higher gas selectivity than the single gas tests.

Automated summary

This paper investigates the impact of different gas mixtures on CO2 separation using an SSZ-13 zeolite membrane, showing good performance at 30 degrees Celsius and 200 kPa pressure, with improved selectivity for various mixed gases. The membrane demonstrated consistent CO2 permeance while reducing the permeance of other gases, leading to increased selectivity across different gas compositions.