Abstract
Membranes only: A hybrid organic–inorganic membrane for CO2 separation is prepared by sol–gel deposition of a microporous ethylene-bridged silsesquioxane layer onto a multilayer support. Low CO2 permeance is imparted by doping acidic niobium centers into the hybrid silica network. The membrane exhibits superior hydrothermal stability with He/CO2 selectivities as high as 3700.
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