Nowadays the Chinese legislative development and the implementation of advanced technologies to curb HDD emissions have been a subject of worldwide attention. Currently China is warping its efforts to deploy and enforce the launch of nationwide Stage IV and is also preparing for the setup and implementation of future regulation standards.
Focus discussion here is on the aftertreatment pathways to meet China current and future emissions standards, based on market uniqueness. This paper seeks to provide retrospectives of the adoption of V-SCR on China stage IV HDD vehicles, through presenting findings from two separate postmortem analyses of field returned catalyst parts and also through comparative study with local catalyst products. The paper also discusses the challenges and possible solutions meeting the WHTC requirement for Stage IV and V city vehicles. Subsequently, the authors will share perspective viewpoints on aftertreatment pathways, especially on technology recommendations, to meet Stage VI HDD emission regulations in China. Based on various aspects such as China Stage IV V-SCR usage experience and Stage VI requirement on low temperature activity, high temperature stability and system robustness, etc., it is concluded that small ring zeolite based Cu-SCR is the most suitable system solution to help meet China Stage VI regulations.
