Molecular‐Sieve Honeycomb for Air Separation from Picea abies

The cellular structure of Norway spruce (Picea abies) was transformed via a simple, single‐step carbonization process into a carbon monolith with molecular‐sieve properties. The monolith exhibited a genuine honeycomb structure derived from the original intrinsic H₂O channels of the wood. The micropores formed during carbonization from the walls of the channels were shown to have a high adsorption capacity. The honeycomb monolith was tested for air separation. Micropore diffusion of N₂ and O₂ was found by the frequency‐response (FR) technique to be the rate‐controlling process of mass transport.