Synthesis optimization of the ultra-microporous [Ni 3 (HCOO) 6 ] framework to improve its CH 4 /N 2 separation selectivity

The adsorptive separation selectivities of CH 4 /N 2 were successfully improved from 4.0–4.8 to 7.0–7.5 via synthesis optimization of ultra-microporous [Ni 3 (HCOO) 6 ] frameworks.