Browse Publications Technical Papers 2019-01-0970
2019-04-02

Design of Catalyzed Gasoline Particulate Filter (cGPF) and Investigation of its Durability Performance Using Accelerated Engine Aging 2019-01-0970

Catalyzed gasoline particulate filter (cGPF) is one of the most effective after-treatment technology to reduce gaseous and particulate emissions simultaneously. Successful adoption of this advanced technology relies on several important performance properties including low back pressure, high filtration efficiency, especially durability compliance. In this work, the backpressure control was achieved through optimizing catalyst coating technology, and modifying the deposition profile of catalyst coating along GPF channels. Underfloor cGPF was used here. Durability performance was demonstrated by using accelerated aging method with selective blending of lubricating oils in fuel, which incorporates the aging mechanisms of ash loading, soot accumulation/regeneration, thermal effect. The target of durability demonstration is to represent 200,000km real world operation. The evaluation of durability performance include vehicle emission test, engine bench test, and backpressure measurement. Additional characterization methods, such as Computerized tomography (CT) scan, Scanning Electron Microscopy / Energy Dispersive X-Ray Spectroscopy (SEM-EDS), were applied to investigate the ash deposition profile inside cGPF and interaction with GPF, and the ash obtained from two different lubricant formulations respectively. The results show that the aging method developed from this work can effectively demonstrate cGPF durability performance. At the end of durability testing, the aged cGPF can still meet China 6 emission regulation requirement.

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