Novel high-silica SSZ-13 zeolite membranes with excellent performance in CO₂/N₂and CO₂/CH₄separation were reproducibly synthesized. Being hydrothermally stable, these membranes are very promising candidates for separation of CO₂from hot and humid flue gas streams.

The dual template synthesis of zeolite SSZ-13 by use of trimethyl-adamantanammonium hydroxide and a diquaternary-ammonium mesoporogen induces considerable mesoporosity without impeding zeolite microporosity. The strongly improved accessibility of Brønsted sites in mesoporous SSZ-13 increases its stability during application as an acid catalyst in the methanol-to-olefins reaction.