Current status and development of purifying automotive exhaust gas with three-way catalysts(TWC),which can purify CO?HC?NO X simultaneously,were reviewed.The properties of TWC consisting of m ain components,assistant agent,coating,carrier were introduced and analyzed.Four future directions,namely three-way catalysts under lean-burning,catalysts none but noble metals,integrative catalysts with carrier and coating,and multi-purifi cation technology(MPT),were discussed briefly,multi-purification techno lo...