MODIFIED LARGE PORE ZEOLITES FOR TRAPPING ALKENES

摘要

A modified large pore zeolite molecular sieve structure is disclosed for adsorbing alkenes emitted during engine start-up, before the catalytic converter has attained its effective operating temperature. The zeolite molecular sieve is modified by inserting certain metal ions into the molecular sieve structure. In particular, a modified y-zeolite having a high adsorption capacity for propylene is disclosed.