Cationic polymers and porous materials

A method for producing a core/shell zeolite comprising a core portion and a shell portion, the method comprising:

• forming a mixture comprising a cationic polymer, precursor materials of the porous material, and one or more core seed materials, the core seed materials comprising a microporous structure;
• forming the shell portion intermediate material around the core seed material, the shell portion intermediate material comprising micropores, where:
• the cationic polymer acts as a structure-directing agent for the formation of the micropores of the shell portion intermediate;
• and
• the cationic polymer comprises monomers that comprise two or more quaternary ammonium cations or quaternary phosphonium cations separated by a hydrocarbon chain;
• and
• calcining the core/shell porous material to form a core/shell zeolite, where the shell portion comprises a mesoporous zeolite.