国六柴油机铜基催化剂劣化规律及评价

苏威，王志坚，杨海龙，朱建荣

潍柴动力股份有限公司，山东 潍坊  261061

摘要：在发动机台架上，利用柴油机颗粒捕集器（diesel particulate filter，DPF）主动再生方式，模拟铜基催化剂热老化环境，对比不同温度（特定工况）、不同老化时间下催化剂的转化效率、NO_x排放量，研究铜基催化剂的劣化规律；制定在发动机台架上考核铜基催化剂劣化的试验方法，并基于催化剂在不同温度点NO_x转化效率限值要求制定铜基催化剂劣化评价标准。试验结果表明,铜基催化剂在DPF主动再生过程中会持续劣化，在100 h时催化剂性能达到稳定；该试验方法和评价标准可为国六铜基催化剂选型提供重要依据。

关键词：柴油机；后处理；铜基催化剂；劣化

Deterioration law and evaluation of Cu-based catalysts for CHINA VI diesel engine

SU Wei, WANG Zhijiang, YANG Hailong, ZHU Jiangrong

Weichai Power Co., Ltd., Weifang 261061，China

Abstract：On the engine test bench, the active regeneration mode of diesel particulate filter (DPF) is used to simulate the thermal aging environment of Cu-based catalyst. Comparing the NO_xconversion efficiency of the catalyst under different temperatures (specific working conditions) and different aging duration, the deterioration law of Cu-based catalyst is studied. The test method for evaluation of Cu-based catalyst deterioration on engine bench is developed, and the deterioration threshold of Cu-based catalyst is formulated based on the requirements of NOx conversion efficiency limit of catalyst at different temperatures. The test results showed that the Cu-based catalyst continually deteriorated in the process of DPF active regeneration, and the performance of the catalyst could be stable at 100 h. The developed test method and evaluation standard in this paper could provide an important basis for the selection of Cu-based catalysts for CHINA VI diesel engine.

Keywords:diesel engine; after-treatment; Cu-based catalyst; degradation