催化剂负载量对三元催化转化器转化效率的影响

The Effects of Catalyst Loading on Conversion Efficiency in Three-way Catalytic Converter

针对三元催化转化器的起燃特性,建立了转化器的数学模型,给出数值求解方法,模拟结果表明:以30 000 m2/m3为基准负载,催化剂均匀分布时,负载量增加2倍,转化率有所增加,但4倍基准负载与2倍基准负载的转化率变化不明显.在催化剂总量不变的情况下,沿轴向递增,转化率有所下降,沿轴向递减,起燃时间缩短,转化率增大.

According to the light-off behavior of three-way catalytic converter,the mathematical model has been developed. Mathematical model was solved by finite difference. It was found that the conversion efficiency was increased by coupling standard loading （30 000 m2/m3） when catalyst distribution was uniform. The conversion efficiencies of 4 times standard and 2 times standard were almost the same. For a fixed amount of metal loading, when catalyst distribution was nonuniform, the conversion efficiency was decreased with more catalyst near the outlet and increased with more catalyst near the inlet.