The conventional threeway catalysts are not efficient enough to remove the CO and hydrocarbons during vehicle coldstart period due to the low temperature of catalyst bed.
汽车冷启动时催化剂床层温度低，尾气中的CO和烃类不能被传统三效催化剂有效消除。
2
In a testing of petrolic engine, about 70% to 80% of nonmethane hydrocarbon is emitted into atmosphere without catalysis conversion in theoment of coldstart, so that serious pollution is produced.