Zinc triazolate oxalate CALF-20 with platelet morphology and its PEBAX-based mixed matrix membranes for CO2/N2 separation

Abstract

CALF-20, [Zn₂(1,2,4-triazolate)₂(oxalate)] shows remarkable performance in post-combustion carbon capture, even under humid conditions¹ but its reported crystal morphology hinders its applicability in mixed matrix membranes (MMMs). Here, a route to its preparation as platelets a few tens of nm thick is reported. These were incorporated into a PEBAX MH1567 polymer matrix and the resultant MMMs display improvement in CO₂ permeability and CO₂/N₂ selectivity.