Pure gas C0 2 /C 2 H 4 selectivity at 20??C Sample 15 psig 45 psig Counter 4.1 4.1 Example 1 Example 6A 4.5 Not tested Example 6B 4.2 4.0 [00069] Table 7 shows the C0 2 /C 2 H 4 selectivity for the Counter Example 1, Example 6 A, and Example 6B. [00070] While the invention has been described above according to its preferred embodiments of the present invention and examples of steps and elements