NOVELTY - Multi-component membrane comprises a mixture of silicone rubber, zeolite particles and a nitrogen containing compound on a cellulose acetate porous support media.    USE - Multi-component membrane for the separation of gases (claimed), e.g. carbon dioxide and methane.    ADVANTAGE - The mixed matrix membrane has improved stability and separation performance resulting from the inclusion of zeolites into the membranes. Optimal results are obtained with 10% zeolite used while higher levels of zeolite had negative impact upon separation and permeance performance. Other improvements are provided by the addition of nitrogen containing compounds, e.g. amines to the formulation.    DETAILED DESCRIPTION - Multi-component membrane comprises a mixture of silicone rubber, zeolite particles and a nitrogen containing compound of NR1R2R3 on a cellulose acetate porous support media.    R1-R3=1-50C alkyl, 3-50C-cycloalkyl, aromatic, alkyl substituted aromatic, e.g. 1-50C alkyl substituted aromatic, aromatic substituted aliphatic moieties, e.g. 1-50C alkylene moieties substituted with aromatic group(s), 1-50C hydroxyalkyl, amino- and/or hydroxyl-substituted 1-50C alkyl, alkoxyalkyl, e.g. 2-50C-alkoxyalkyl, dialkylaminoalkyl, e.g. 3-50C-di-alkylaminoalkyl, alkylaminoalkyl, e.g. 2-50C alkylaminoalkyl, heterocyclic, aromatic heterocyclic, alkyl substituted heterocyclic and alkyl substituted aromatic heterocyclic, e.g. 1-50C alkyl substituted heterocyclic and aromatic heterocyclic compounds, or heterocyclic substituted aliphatic moieties, e.g. 1-50C alkylene moieties substituted with aromatic group(s).    Provided that, R1 and R2 may be hydrogen and may form, with nitrogen, a nitrogen-containing heterocycle, aromatic heterocycle, alkyl substituted heterocycle or alkyl substituted aromatic heterocycle. When R3 is alkyl and R1 and R2 are hydrogen then R3 is 4-50C alkyl. An INDEPENDENT CLAIM is included for a process for separating a gas mixture comprising contacting a pressurized gas mixture with the above multi-component membrane.